Offline dictionary (#45)

* Added support for external dictionary apps and a dictionary settings sheet.

* Refactored external dictionary integration and improved package visibility

 - Updated `AndroidManifest.xml` with `<queries>` for common dictionary apps and intent actions (`PROCESS_TEXT`, `SEARCH`, `SEND`) to support Android 11+ package visibility.
 - Refactored `ExternalDictionaryHelper` to streamline dictionary discovery using `Intent.ACTION_PROCESS_TEXT` and `colordict.intent.action.SEARCH`.
 - Added a package blocklist in `ExternalDictionaryHelper` to filter out system services (e.g., Samsung Pass, GMS) from dictionary lists.
  - Simplified `launchDictionary` logic to prioritize `PROCESS_TEXT` intents.
 - Fixed a bug in `PdfViewerScreen` to only show the dictionary upsell dialog when `useOnlineDictionary` is enabled.

* Refactored dictionary settings into a dialog and updated dictionary selection logic.

- Renamed `DictionarySettingsSheet` to `DictionarySettingsDialog` and converted it from a bottom sheet to a formal dialog.
- Redesigned the dictionary settings UI with a clearer distinction between AI and external app modes.
- Added a "Search" option to the external dictionary list that triggers a web search.
- Updated `ExternalDictionaryHelper` to include a package blocklist and support for generic web search intents.
- Simplified `PdfHelper` by removing Pro user checks for the "Dictionary" action.
- Updated icons for dictionary settings across the EPUB and PDF readers.

app/src/main/AndroidManifest.xml

@@ -11,6 +11,26 @@
         </intent>
     </queries>
 
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT" />
+            <data android:mimeType="text/plain" />
+        </intent>
+        <intent>
+            <action android:name="colordict.intent.action.SEARCH" />
+        </intent>
+        <intent>
+            <action android:name="android.intent.action.SEND" />
+            <data android:mimeType="text/plain" />
+        </intent>
+
+        <package android:name="it.t_arn.aard2" />
+        <package android:name="io.github.mvasilev.dictionary" />
+        <package android:name="com.github.tngande.ossdict" />
+        <package android:name="com.gaurav.lookup" />
+        <package android:name="com.randallbaltazar.lookup" />
+    </queries>
+
     <application
         android:name=".MyApplication"
         android:allowBackup="true"

app/src/main/java/com/aryan/reader/Common.kt

@@ -104,6 +104,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.platform.LocalSoftwareKeyboardController
 import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.TextLayoutResult
@@ -531,7 +532,8 @@ fun AiDefinitionPopup(
     result: AiDefinitionResult?,
     isLoading: Boolean,
     onDismiss: () -> Unit,
-    isMainTtsActive: Boolean = false
+    isMainTtsActive: Boolean = false,
+    onOpenExternalDictionary: () -> Unit
 ) {
     val ttsController = rememberTtsController()
     val ttsState by ttsController.ttsState.collectAsState()
@@ -642,6 +644,13 @@ fun AiDefinitionPopup(
                                     contentDescription = "Copy"
                                 )
                             }
+                            Spacer(modifier = Modifier.width(8.dp))
+                            IconButton(onClick = onOpenExternalDictionary) {
+                                Icon(
+                                    painter = painterResource(id = R.drawable.dictionary),
+                                    contentDescription = "Open in Dictionary App"
+                                )
+                            }
                         }
                     }
 

app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt

@@ -975,7 +975,7 @@ fun ChapterWebView(
                         }
 
                         // 3. Dictionary Option (Preserving Logic)
-                        if (!isOss && state.selectedText.length <= 2000) {
+                        if (state.selectedText.length <= 2000) {
                             HorizontalDivider()
                             Row(
                                 modifier = Modifier
@@ -983,12 +983,7 @@ fun ChapterWebView(
                                     .clickable {
                                         val textToDefine = state.selectedText
                                         if (textToDefine.isNotBlank()) {
-                                            val wordCount = countWords(textToDefine)
+                                            onWordSelectedForAiDefinition(textToDefine)
-                                            if (isProUser || wordCount <= 1) {
-                                                onWordSelectedForAiDefinition(textToDefine)
-                                            } else {
-                                                onShowDictionaryUpsellDialog()
-                                            }
                                         }
                                         customMenuState = null
                                     }

app/src/main/java/com/aryan/reader/epubreader/DictionarySettingsDialog.kt

@@ -0,0 +1,299 @@
+// DictionarySettingsDialog.kt
+package com.aryan.reader.epubreader
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.Dialog
+import androidx.core.graphics.drawable.toBitmap
+import com.aryan.reader.BuildConfig
+import com.aryan.reader.R
+
+@Suppress("KotlinConstantConditions")
+@Composable
+fun DictionarySettingsDialog(
+    isVisible: Boolean,
+    onDismiss: () -> Unit,
+    isProUser: Boolean,
+    useOnlineDictionary: Boolean,
+    onToggleOnlineDictionary: (Boolean) -> Unit,
+    selectedPackageName: String?,
+    onSelectPackage: (String) -> Unit
+) {
+    if (!isVisible) return
+
+    val context = LocalContext.current
+    var availableApps by remember { mutableStateOf<List<ExternalDictionaryApp>>(emptyList()) }
+
+    LaunchedEffect(Unit) {
+        availableApps = ExternalDictionaryHelper.getAvailableDictionaries(context)
+    }
+
+    Dialog(onDismissRequest = onDismiss) {
+        Surface(
+            shape = RoundedCornerShape(16.dp),
+            color = MaterialTheme.colorScheme.surface,
+            modifier = Modifier.fillMaxWidth()
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 24.dp, vertical = 24.dp)
+            ) {
+                // Header
+                Text(
+                    text = "Dictionary Settings",
+                    style = MaterialTheme.typography.headlineSmall,
+                    fontWeight = FontWeight.Bold,
+                    modifier = Modifier.padding(bottom = 16.dp)
+                )
+
+                if (BuildConfig.FLAVOR != "oss") {
+                    Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                        Surface(
+                            shape = RoundedCornerShape(12.dp),
+                            color = if (useOnlineDictionary) MaterialTheme.colorScheme.primaryContainer else Color.Transparent,
+                            border = BorderStroke(
+                                1.dp,
+                                if (useOnlineDictionary) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.outlineVariant
+                            ),
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .clickable { onToggleOnlineDictionary(true) }
+                        ) {
+                            Row(
+                                modifier = Modifier.padding(16.dp),
+                                verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                Icon(
+                                    painter = painterResource(id = R.drawable.ai),
+                                    contentDescription = null,
+                                    tint = if (useOnlineDictionary) MaterialTheme.colorScheme.onPrimaryContainer else MaterialTheme.colorScheme.onSurfaceVariant,
+                                    modifier = Modifier.size(24.dp)
+                                )
+                                Spacer(modifier = Modifier.width(16.dp))
+                                Column(modifier = Modifier.weight(1f)) {
+                                    Text(
+                                        text = "AI Smart Dictionary",
+                                        style = MaterialTheme.typography.titleMedium,
+                                        fontWeight = FontWeight.Bold,
+                                        color = if (useOnlineDictionary) MaterialTheme.colorScheme.onPrimaryContainer else MaterialTheme.colorScheme.onSurface
+                                    )
+                                    Text(
+                                        text = "Contextual definitions powered by AI.",
+                                        style = MaterialTheme.typography.bodySmall,
+                                        color = if (useOnlineDictionary) MaterialTheme.colorScheme.onPrimaryContainer.copy(alpha = 0.8f) else MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                }
+                                if (useOnlineDictionary) {
+                                    Icon(
+                                        imageVector = Icons.Default.Check,
+                                        contentDescription = "Selected",
+                                        tint = MaterialTheme.colorScheme.primary
+                                    )
+                                }
+                            }
+                        }
+
+                        // External App Option
+                        Surface(
+                            shape = RoundedCornerShape(12.dp),
+                            color = if (!useOnlineDictionary) MaterialTheme.colorScheme.primaryContainer else Color.Transparent,
+                            border = BorderStroke(
+                                1.dp,
+                                if (!useOnlineDictionary) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.outlineVariant
+                            ),
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .clickable { onToggleOnlineDictionary(false) }
+                        ) {
+                            Row(
+                                modifier = Modifier.padding(16.dp),
+                                verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                Icon(
+                                    painter = painterResource(id = R.drawable.dictionary),
+                                    contentDescription = null,
+                                    tint = if (!useOnlineDictionary) MaterialTheme.colorScheme.onPrimaryContainer else MaterialTheme.colorScheme.onSurfaceVariant,
+                                    modifier = Modifier.size(24.dp)
+                                )
+                                Spacer(modifier = Modifier.width(16.dp))
+                                Column(modifier = Modifier.weight(1f)) {
+                                    Text(
+                                        text = "External App",
+                                        style = MaterialTheme.typography.titleMedium,
+                                        fontWeight = FontWeight.Bold,
+                                        color = if (!useOnlineDictionary) MaterialTheme.colorScheme.onPrimaryContainer else MaterialTheme.colorScheme.onSurface
+                                    )
+                                    Text(
+                                        text = "Launch an offline dictionary or search app.",
+                                        style = MaterialTheme.typography.bodySmall,
+                                        color = if (!useOnlineDictionary) MaterialTheme.colorScheme.onPrimaryContainer.copy(alpha = 0.8f) else MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                }
+                                if (!useOnlineDictionary) {
+                                    Icon(
+                                        imageVector = Icons.Default.Check,
+                                        contentDescription = "Selected",
+                                        tint = MaterialTheme.colorScheme.primary
+                                    )
+                                }
+                            }
+                        }
+                    }
+
+                    Spacer(modifier = Modifier.height(24.dp))
+
+                    Text(
+                        text = if (useOnlineDictionary) "Fallback External App (Used when offline)" else "Select External App",
+                        style = MaterialTheme.typography.labelLarge,
+                        color = MaterialTheme.colorScheme.primary,
+                        modifier = Modifier.padding(bottom = 8.dp)
+                    )
+
+                } else {
+                    // OSS FLAVOR UI (Dedicated to external apps)
+                    Surface(
+                        color = MaterialTheme.colorScheme.secondaryContainer,
+                        shape = RoundedCornerShape(12.dp),
+                        modifier = Modifier.padding(bottom = 16.dp)
+                    ) {
+                        Row(modifier = Modifier.padding(16.dp), verticalAlignment = Alignment.CenterVertically) {
+                            Icon(
+                                painter = painterResource(id = R.drawable.dictionary),
+                                contentDescription = null,
+                                tint = MaterialTheme.colorScheme.onSecondaryContainer,
+                                modifier = Modifier.size(32.dp)
+                            )
+                            Spacer(Modifier.width(12.dp))
+                            Text(
+                                text = "Choose an external app to define selected words.",
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.onSecondaryContainer
+                            )
+                        }
+                    }
+                }
+
+                // App List
+                if (availableApps.isEmpty()) {
+                    Box(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .padding(24.dp),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Text(
+                            "No supported dictionary apps found.",
+                            style = MaterialTheme.typography.bodyMedium,
+                            color = MaterialTheme.colorScheme.error,
+                            textAlign = TextAlign.Center
+                        )
+                    }
+                } else {
+                    LazyColumn(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .heightIn(max = 300.dp) // Bound height so it doesn't take over screen
+                            .background(MaterialTheme.colorScheme.surfaceContainerLowest, RoundedCornerShape(12.dp))
+                    ) {
+                        items(availableApps) { app ->
+                            val isSelected = app.packageName == selectedPackageName
+                            Row(
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .clickable { onSelectPackage(app.packageName) }
+                                    .padding(vertical = 12.dp, horizontal = 8.dp),
+                                verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                // Dynamic Icon handling
+                                if (app.packageName == ExternalDictionaryHelper.GOOGLE_SEARCH_PKG) {
+                                    Box(
+                                        modifier = Modifier
+                                            .size(40.dp)
+                                            .background(MaterialTheme.colorScheme.secondaryContainer, RoundedCornerShape(8.dp)),
+                                        contentAlignment = Alignment.Center
+                                    ) {
+                                        Icon(
+                                            imageVector = Icons.Default.Search,
+                                            contentDescription = "Search",
+                                            tint = MaterialTheme.colorScheme.onSecondaryContainer,
+                                            modifier = Modifier.size(24.dp)
+                                        )
+                                    }
+                                } else if (app.icon != null) {
+                                    Image(
+                                        bitmap = app.icon.toBitmap().asImageBitmap(),
+                                        contentDescription = null,
+                                        modifier = Modifier.size(40.dp)
+                                    )
+                                } else {
+                                    Box(
+                                        modifier = Modifier
+                                            .size(40.dp)
+                                            .background(MaterialTheme.colorScheme.surfaceVariant, RoundedCornerShape(8.dp))
+                                    )
+                                }
+
+                                Spacer(modifier = Modifier.width(16.dp))
+                                Text(
+                                    text = app.label,
+                                    style = MaterialTheme.typography.bodyLarge,
+                                    fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,
+                                    modifier = Modifier.weight(1f)
+                                )
+
+                                if (isSelected) {
+                                    Icon(
+                                        imageVector = Icons.Default.Check,
+                                        contentDescription = "Selected",
+                                        tint = MaterialTheme.colorScheme.primary
+                                    )
+                                }
+                            }
+                            HorizontalDivider(color = MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.5f))
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/aryan/reader/epubreader/EpubReaderAi.kt

@@ -227,21 +227,16 @@ suspend fun executeRecapLogic(
  */
 @Composable
 fun EpubReaderAiOverlays(
-    // Summarization State
     showSummarizationPopup: Boolean,
     summarizationResult: SummarizationResult?,
     isSummarizationLoading: Boolean,
     onDismissSummarization: () -> Unit,
     showSummarizationUpsellDialog: Boolean,
     onDismissSummarizationUpsell: () -> Unit,
-
-    // Recap State
     showRecapPopup: Boolean,
     recapResult: SummarizationResult?,
     isRecapLoading: Boolean,
     onDismissRecap: () -> Unit,
-
-    // Dictionary State
     showAiDefinitionPopup: Boolean,
     selectedTextForAi: String?,
     aiDefinitionResult: AiDefinitionResult?,
@@ -249,10 +244,9 @@ fun EpubReaderAiOverlays(
     onDismissAiDefinition: () -> Unit,
     showDictionaryUpsellDialog: Boolean,
     onDismissDictionaryUpsell: () -> Unit,
-
-    // Navigation
     onNavigateToPro: () -> Unit,
-    isTtsSessionActive: Boolean
+    isTtsSessionActive: Boolean,
+    onOpenExternalDictionary: (String) -> Unit
 ) {
     if (showSummarizationPopup) {
         SummarizationPopup(
@@ -298,7 +292,11 @@ fun EpubReaderAiOverlays(
             result = aiDefinitionResult,
             isLoading = isAiDefinitionLoading,
             onDismiss = onDismissAiDefinition,
-            isMainTtsActive = isTtsSessionActive
+            isMainTtsActive = isTtsSessionActive,
+            // Pass it down
+            onOpenExternalDictionary = {
+                selectedTextForAi?.let { text -> onOpenExternalDictionary(text) }
+            }
         )
     }
 

app/src/main/java/com/aryan/reader/epubreader/EpubReaderControls.kt

@@ -67,6 +67,7 @@ import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.MenuBook
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.ArrowDropDown
 import androidx.compose.material.icons.filled.Check
@@ -148,6 +149,7 @@ fun EpubReaderTopBar(
     onStartAutoScroll: () -> Unit,
     onOpenTtsSettings: () -> Unit,
     onOpenDeviceVoiceSettings: () -> Unit,
+    onOpenDictionarySettings: () -> Unit,
     searchFocusRequester: androidx.compose.ui.focus.FocusRequester,
     modifier: Modifier = Modifier,
     onToggleReflow: (() -> Unit)? = null,
@@ -190,6 +192,12 @@ fun EpubReaderTopBar(
                         overflow = TextOverflow.Ellipsis,
                         modifier = Modifier.weight(1f)
                     )
+                    IconButton(onClick = onOpenDictionarySettings) {
+                        Icon(
+                            painter = painterResource(id = R.drawable.dictionary),
+                            contentDescription = "Dictionary Settings"
+                        )
+                    }
                     Box {
                         var showMoreMenu by remember { mutableStateOf(false) }
                         IconButton(onClick = { showMoreMenu = true }) {

app/src/main/java/com/aryan/reader/epubreader/EpubReaderScreen.kt

@@ -32,6 +32,7 @@ import android.media.AudioManager
 import android.net.Uri
 import android.os.Build
 import android.webkit.WebView
+import android.widget.Toast
 import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
@@ -280,6 +281,30 @@ private fun saveTtsMode(context: Context, modeName: String) {
     prefs.edit { putString(TTS_MODE_KEY, modeName) }
 }
 
+private const val PREF_USE_ONLINE_DICT = "use_online_dictionary"
+private const val PREF_EXTERNAL_DICT_PKG = "external_dictionary_package"
+
+private fun loadUseOnlineDict(context: Context): Boolean {
+    if (BuildConfig.FLAVOR == "oss") return false
+    val prefs = context.getSharedPreferences("reader_prefs", Context.MODE_PRIVATE)
+    return prefs.getBoolean(PREF_USE_ONLINE_DICT, true)
+}
+
+private fun saveUseOnlineDict(context: Context, useOnline: Boolean) {
+    val prefs = context.getSharedPreferences("reader_prefs", Context.MODE_PRIVATE)
+    prefs.edit { putBoolean(PREF_USE_ONLINE_DICT, useOnline) }
+}
+
+private fun loadExternalDictPackage(context: Context): String? {
+    val prefs = context.getSharedPreferences("reader_prefs", Context.MODE_PRIVATE)
+    return prefs.getString(PREF_EXTERNAL_DICT_PKG, null)
+}
+
+private fun saveExternalDictPackage(context: Context, packageName: String) {
+    val prefs = context.getSharedPreferences("reader_prefs", Context.MODE_PRIVATE)
+    prefs.edit { putString(PREF_EXTERNAL_DICT_PKG, packageName) }
+}
+
 @RequiresApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
 @Composable
 fun EpubReaderScreen(
@@ -334,6 +359,7 @@ fun EpubReaderScreen(
     )
 }
 
+@Suppress("ControlFlowWithEmptyBody")
 @SuppressLint("UnusedBoxWithConstraintsScope", "ObsoleteSdkInt")
 @androidx.annotation.OptIn(UnstableApi::class)
 @RequiresApi(Build.VERSION_CODES.VANILLA_ICE_CREAM)
@@ -516,6 +542,61 @@ fun EpubReaderHost(
         saveHighlightsToPrefs(context, epubBook.title, userHighlights)
     }
 
+    // Dictionary
+    var showAiDefinitionPopup by remember { mutableStateOf(false) }
+    var selectedTextForAi by remember { mutableStateOf<String?>(null) }
+    var aiDefinitionResult by remember { mutableStateOf<AiDefinitionResult?>(null) }
+    var isAiDefinitionLoading by remember { mutableStateOf(false) }
+
+    var showDictionarySettingsSheet by remember { mutableStateOf(false) }
+
+    var useOnlineDictionary by remember {
+        mutableStateOf(loadUseOnlineDict(context))
+    }
+    var selectedDictPackage by remember {
+        mutableStateOf(loadExternalDictPackage(context))
+    }
+
+    var showDictionaryUpsellDialog by remember { mutableStateOf(false) }
+    var showSummarizationUpsellDialog by remember { mutableStateOf(false) }
+
+    val onDictionaryLookup = { word: String ->
+        val isOss = BuildConfig.FLAVOR == "oss"
+        val effectiveUseOnline = !isOss && useOnlineDictionary
+
+        if (effectiveUseOnline) {
+            val wordCount = countWords(word)
+            if (isProUser || wordCount <= 1) {
+                selectedTextForAi = word
+                showAiDefinitionPopup = true
+                scope.launch {
+                    isAiDefinitionLoading = true
+                    aiDefinitionResult = null
+                    fetchAiDefinition(
+                        text = word,
+                        onUpdate = { chunk ->
+                            val currentDefinition = aiDefinitionResult?.definition ?: ""
+                            aiDefinitionResult = AiDefinitionResult(definition = currentDefinition + chunk)
+                        },
+                        onError = { error ->
+                            aiDefinitionResult = AiDefinitionResult(error = error)
+                        },
+                        onFinish = { isAiDefinitionLoading = false }
+                    )
+                }
+            } else {
+                showDictionaryUpsellDialog = true
+            }
+        } else {
+            if (selectedDictPackage != null) {
+                ExternalDictionaryHelper.launchDictionary(context, selectedDictPackage!!, word)
+            } else {
+                Toast.makeText(context, "Please select a dictionary app first.", Toast.LENGTH_SHORT).show()
+                showDictionarySettingsSheet = true
+            }
+        }
+    }
+
     val summaryCacheManager = remember(context) { SummaryCacheManager(context) }
     var showRecapPopup by remember { mutableStateOf(false) }
     var recapResult by remember { mutableStateOf<SummarizationResult?>(null) }
@@ -585,17 +666,9 @@ fun EpubReaderHost(
 
     var webViewRefForTts by remember { mutableStateOf<WebView?>(null) }
 
-    // Dictionary
-    var showAiDefinitionPopup by remember { mutableStateOf(false) }
-    var selectedTextForAi by remember { mutableStateOf<String?>(null) }
-    var aiDefinitionResult by remember { mutableStateOf<AiDefinitionResult?>(null) }
-    var isAiDefinitionLoading by remember { mutableStateOf(false) }
-
     var showSummarizationPopup by remember { mutableStateOf(false) }
     var summarizationResult by remember { mutableStateOf<SummarizationResult?>(null) }
     var isSummarizationLoading by remember { mutableStateOf(false) }
-    var showDictionaryUpsellDialog by remember { mutableStateOf(false) }
-    var showSummarizationUpsellDialog by remember { mutableStateOf(false) }
 
     val epubSearcher = remember(epubBook) { createEpubSearcher(epubBook) }
 
@@ -2101,32 +2174,7 @@ fun EpubReaderHost(
                                                 }
                                             },
                                             onWordSelectedForAiDefinition = { text ->
-                                                val wordCount = countWords(text)
+                                                onDictionaryLookup(text)
-                                                if (isProUser || wordCount <= 1) {
-                                                    Timber.d("Text selected for AI definition: $text"
-                                                    )
-                                                    selectedTextForAi = text
-                                                    showAiDefinitionPopup = true
-                                                    scope.launch {
-                                                        isAiDefinitionLoading = true
-                                                        aiDefinitionResult = null
-                                                        fetchAiDefinition(
-                                                            text = text,
-                                                            onUpdate = { chunk ->
-                                                                val currentDefinition = aiDefinitionResult?.definition ?: ""
-                                                                aiDefinitionResult = AiDefinitionResult(definition = currentDefinition + chunk)
-                                                            },
-                                                            onError = { error ->
-                                                                aiDefinitionResult = AiDefinitionResult(error = error)
-                                                            },
-                                                            onFinish = {
-                                                                isAiDefinitionLoading = false
-                                                            }
-                                                        )
-                                                    }
-                                                } else {
-                                                    showDictionaryUpsellDialog = true
-                                                }
                                             },
                                             onContentReadyForSummarization = { content ->
                                                 Timber.d("Content received for summarization")
@@ -2461,32 +2509,7 @@ fun EpubReaderHost(
                                     showDictionaryUpsellDialog = true
                                 },
                                 onWordSelectedForAiDefinition = { text ->
-                                    val wordCount = countWords(text)
+                                    onDictionaryLookup(text)
-                                    if (isProUser || wordCount <= 1) {
-                                        Timber.d("Text selected for AI definition: $text"
-                                        )
-                                        selectedTextForAi = text
-                                        showAiDefinitionPopup = true
-                                        scope.launch {
-                                            isAiDefinitionLoading = true
-                                            aiDefinitionResult = null
-                                            fetchAiDefinition(
-                                                text = text,
-                                                onUpdate = { chunk ->
-                                                    val currentDefinition = aiDefinitionResult?.definition ?: ""
-                                                    aiDefinitionResult = AiDefinitionResult(definition = currentDefinition + chunk)
-                                                },
-                                                onError = { error ->
-                                                    aiDefinitionResult = AiDefinitionResult(error = error)
-                                                },
-                                                onFinish = {
-                                                    isAiDefinitionLoading = false
-                                                }
-                                            )
-                                        }
-                                    } else {
-                                        showDictionaryUpsellDialog = true
-                                    }
                                 },
                                 userHighlights = userHighlights.filter { it.chapterIndex == (currentChapterInPaginatedMode ?: -1) },
                                 onHighlightCreated = { cfi, text, colorId ->
@@ -2992,6 +3015,7 @@ fun EpubReaderHost(
                     searchFocusRequester = searchFocusRequester,
                     modifier = Modifier.align(Alignment.TopCenter),
                     onOpenTtsSettings = { showTtsSettingsSheet = true },
+                    onOpenDictionarySettings = { showDictionarySettingsSheet = true },
                     onOpenDeviceVoiceSettings = { showDeviceVoiceSettingsSheet = true },
                     onToggleReflow = onToggleReflow,
                 )
@@ -3322,9 +3346,16 @@ fun EpubReaderHost(
                     },
                     showDictionaryUpsellDialog = showDictionaryUpsellDialog,
                     onDismissDictionaryUpsell = { showDictionaryUpsellDialog = false },
-
                     onNavigateToPro = onNavigateToPro,
-                    isTtsSessionActive = isTtsSessionActive
+                    isTtsSessionActive = isTtsSessionActive,
+                    onOpenExternalDictionary = { text ->
+                        if (selectedDictPackage != null) {
+                            ExternalDictionaryHelper.launchDictionary(context, selectedDictPackage!!, text)
+                        } else {
+                            Toast.makeText(context, "Select an offline dictionary first.", Toast.LENGTH_SHORT).show()
+                            showDictionarySettingsSheet = true
+                        }
+                    }
                 )
 
                 if (isNavigatingToBookmark) {
@@ -3483,6 +3514,24 @@ fun EpubReaderHost(
             )
         }
 
+        if (showDictionarySettingsSheet) {
+            DictionarySettingsDialog(
+                isVisible = true,
+                onDismiss = { showDictionarySettingsSheet = false },
+                isProUser = isProUser,
+                useOnlineDictionary = useOnlineDictionary,
+                onToggleOnlineDictionary = { newState ->
+                    useOnlineDictionary = newState
+                    saveUseOnlineDict(context, newState)
+                },
+                selectedPackageName = selectedDictPackage,
+                onSelectPackage = { pkg ->
+                    selectedDictPackage = pkg
+                    saveExternalDictPackage(context, pkg)
+                }
+            )
+        }
+
         if (showDeviceVoiceSettingsSheet) {
             DeviceVoiceSettingsSheet(
                 isVisible = true,

app/src/main/java/com/aryan/reader/epubreader/ExternalDictionaryHelper.kt

@@ -0,0 +1,154 @@
+// ExternalDictionaryHelper.kt
+package com.aryan.reader.epubreader
+
+import android.app.SearchManager
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.graphics.drawable.Drawable
+import android.os.Build
+import android.widget.Toast
+import timber.log.Timber
+
+data class ExternalDictionaryApp(
+    val label: String,
+    val packageName: String,
+    val icon: Drawable?
+)
+
+object ExternalDictionaryHelper {
+    const val GOOGLE_SEARCH_PKG = "app.internal.google_search"
+
+    private val PACKAGE_BLOCKLIST = setOf(
+        "com.samsung.android.samsungpassautofill",
+        "com.samsung.android.samsungpass",
+        "com.samsung.android.app.pass",
+        "com.google.android.gms",
+        "com.truecaller",
+        "com.adobe.reader",
+        "com.reddit.frontpage"
+    )
+
+    fun getAvailableDictionaries(context: Context): List<ExternalDictionaryApp> {
+        val pm = context.packageManager
+        val apps = mutableListOf<ExternalDictionaryApp>()
+        val addedPackages = mutableSetOf<String>()
+
+        val processTextIntent = Intent(Intent.ACTION_PROCESS_TEXT).setType("text/plain")
+        val textResolvers = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            pm.queryIntentActivities(processTextIntent, PackageManager.ResolveInfoFlags.of(0))
+        } else {
+            @Suppress("DEPRECATION") pm.queryIntentActivities(processTextIntent, 0)
+        }
+
+        textResolvers.forEach { ri ->
+            val pkg = ri.activityInfo.packageName
+            if (!PACKAGE_BLOCKLIST.contains(pkg) && addedPackages.add(pkg)) {
+                apps.add(ExternalDictionaryApp(
+                    label = ri.loadLabel(pm).toString(),
+                    packageName = pkg,
+                    icon = ri.loadIcon(pm)
+                ))
+            }
+        }
+
+        val colorDictIntent = Intent("colordict.intent.action.SEARCH")
+        val colorResolvers = pm.queryIntentActivities(colorDictIntent, 0)
+        colorResolvers.forEach { ri ->
+            val pkg = ri.activityInfo.packageName
+            if (!PACKAGE_BLOCKLIST.contains(pkg) && addedPackages.add(pkg)) {
+                apps.add(ExternalDictionaryApp(
+                    label = ri.loadLabel(pm).toString(),
+                    packageName = pkg,
+                    icon = ri.loadIcon(pm)
+                ))
+            }
+        }
+
+        val sortedApps = apps.sortedBy { it.label }.toMutableList()
+
+        // Inject Google Search at the top
+        sortedApps.add(
+            0,
+            ExternalDictionaryApp(
+                label = "Search",
+                packageName = GOOGLE_SEARCH_PKG,
+                icon = null
+            )
+        )
+
+        return sortedApps
+    }
+
+    fun launchDictionary(context: Context, packageName: String, query: String) {
+        val pm = context.packageManager
+        try {
+            if (packageName == GOOGLE_SEARCH_PKG) {
+                val searchIntent = Intent(Intent.ACTION_WEB_SEARCH).apply {
+                    putExtra(SearchManager.QUERY, query)
+                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                }
+                context.startActivity(searchIntent)
+                return
+            }
+
+            val processTextIntent = Intent(Intent.ACTION_PROCESS_TEXT).apply {
+                type = "text/plain"
+                putExtra(Intent.EXTRA_PROCESS_TEXT, query)
+                putExtra(Intent.EXTRA_PROCESS_TEXT_READONLY, true)
+                setPackage(packageName)
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            }
+
+            if (processTextIntent.resolveActivity(pm) != null) {
+                context.startActivity(processTextIntent)
+                return
+            }
+
+            val dictIntent = Intent("colordict.intent.action.SEARCH").apply {
+                putExtra("EXTRA_QUERY", query)
+                setPackage(packageName)
+                addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            }
+
+            if (dictIntent.resolveActivity(pm) != null) {
+                context.startActivity(dictIntent)
+                return
+            }
+
+            if (packageName == "it.t_arn.aard2") {
+                val aardIntent = Intent("aard2.lookup").apply {
+                    putExtra("query", query)
+                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+                }
+                context.startActivity(aardIntent)
+                return
+            }
+
+            launchGenericSend(context, packageName, query)
+
+        } catch (e: Exception) {
+            Timber.e(e, "Failed to launch dictionary app: $packageName")
+            Toast.makeText(context, "Error opening dictionary", Toast.LENGTH_SHORT).show()
+        }
+    }
+
+    private fun launchGenericSend(context: Context, packageName: String, query: String) {
+        val sendIntent = Intent(Intent.ACTION_SEND)
+        sendIntent.type = "text/plain"
+        sendIntent.putExtra(Intent.EXTRA_TEXT, query)
+        sendIntent.setPackage(packageName)
+        sendIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+        try {
+            context.startActivity(sendIntent)
+        } catch (e: Exception) {
+            val launchIntent = context.packageManager.getLaunchIntentForPackage(packageName)
+            if (launchIntent != null) {
+                context.startActivity(launchIntent)
+            } else {
+                throw e
+            }
+        }
+    }
+}

app/src/main/java/com/aryan/reader/paginatedreader/PaginatedReader.kt

@@ -1467,15 +1467,9 @@ internal fun PaginatedReaderContent(
 
                         if (isForDictionary) {
                             if (!text.isNullOrBlank()) {
-                                if (isProUser || countWords(text) <= 1) {
+                                onWordSelectedForAiDefinition(text)
-                                    if (text.length <= 2000) {
-                                        onWordSelectedForAiDefinition(text)
-                                    }
-                                } else {
-                                    onShowDictionaryUpsellDialog()
-                                }
                             }
-                        } else if (isForHighlight) {
+                        }  else if (isForHighlight) {
                             // Do not copy to real clipboard
                         } else {
                             realClipboard.setClipEntry(clipEntry)
@@ -3022,28 +3016,26 @@ private fun PaginatedTextSelectionMenu(
             }
 
             // 5. Dictionary Option
-            if (!isOss) {
+            HorizontalDivider()
-                HorizontalDivider()
+            Row(
-                Row(
+                modifier = Modifier
-                    modifier = Modifier
+                    .fillMaxWidth()
-                        .fillMaxWidth()
+                    .clickable(onClick = onDictionary)
-                        .clickable(onClick = onDictionary)
+                    .padding(horizontal = 16.dp, vertical = 12.dp),
-                        .padding(horizontal = 16.dp, vertical = 12.dp),
+                verticalAlignment = Alignment.CenterVertically,
-                    verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(12.dp)
-                    horizontalArrangement = Arrangement.spacedBy(12.dp)
+            ) {
-                ) {
+                Icon(
-                    Icon(
+                    painter = painterResource(id = R.drawable.dictionary),
-                        painter = painterResource(id = R.drawable.dictionary),
+                    contentDescription = null,
-                        contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onSurface,
-                        tint = MaterialTheme.colorScheme.onSurface,
+                    modifier = Modifier.size(20.dp)
-                        modifier = Modifier.size(20.dp)
+                )
-                    )
+                Text(
-                    Text(
+                    "Dictionary",
-                        "Dictionary",
+                    style = MaterialTheme.typography.bodyMedium,
-                        style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurface
-                        color = MaterialTheme.colorScheme.onSurface
+                )
-                    )
-                }
             }
         }
     }

app/src/main/java/com/aryan/reader/pdf/PdfHelper.kt

@@ -129,9 +129,7 @@ internal fun PdfSelectionMenuPopup(
     popupPositionProvider: PopupPositionProvider,
     onCopy: (String) -> Unit,
     onAiDefine: (String) -> Unit,
-    onSelectAll: () -> Unit,
+    onSelectAll: () -> Unit
-    isProUser: Boolean,
-    onShowUpsellDialog: () -> Unit,
 ) {
     Popup(
         popupPositionProvider = popupPositionProvider,
@@ -157,11 +155,7 @@ internal fun PdfSelectionMenuPopup(
                 }
                 if (menuState.selectedText.length <= 2000) {
                     TextButton(onClick = {
-                        if (isProUser || countWords(menuState.selectedText) <= 1) {
+                        onAiDefine(menuState.selectedText)
-                            onAiDefine(menuState.selectedText)
-                        } else {
-                            onShowUpsellDialog()
-                        }
                     }) {
                         Text("Dictionary")
                     }

app/src/main/java/com/aryan/reader/pdf/PdfPageComposable.kt

@@ -4557,9 +4557,7 @@ private fun PdfPageRenderer(
                     popupPositionProvider = popupPositionProvider,
                     onCopy = onCopy,
                     onAiDefine = onAiDefine,
-                    onSelectAll = onSelectAll,
+                    onSelectAll = onSelectAll
-                    isProUser = isProUser,
-                    onShowUpsellDialog = onShowUpsellDialog
                 )
             }
         }

app/src/main/java/com/aryan/reader/pdf/PdfViewerScreen.kt

@@ -29,14 +29,12 @@ import android.content.Context
 import android.content.pm.PackageManager
 import android.graphics.Bitmap
 import android.graphics.RectF
-import androidx.compose.material3.SnackbarDuration
-import androidx.compose.material3.SnackbarResult
 import android.net.Uri
 import android.os.Build
 import android.os.ParcelFileDescriptor
 import android.provider.OpenableColumns
-import androidx.compose.foundation.border
 import android.util.Base64
+import android.widget.Toast
 import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
@@ -55,6 +53,7 @@ import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.Canvas
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
+import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.gestures.detectDragGestures
 import androidx.compose.foundation.gestures.detectDragGesturesAfterLongPress
@@ -90,6 +89,7 @@ import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardActions
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.automirrored.filled.MenuBook
 import androidx.compose.material.icons.filled.ArrowDownward
 import androidx.compose.material.icons.filled.ArrowUpward
 import androidx.compose.material.icons.filled.Brush
@@ -133,8 +133,10 @@ import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.RadioButton
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Slider
+import androidx.compose.material3.SnackbarDuration
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.SnackbarResult
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Tab
 import androidx.compose.material3.TabRow
@@ -236,7 +238,10 @@ import com.aryan.reader.SearchTopBar
 import com.aryan.reader.SummarizationPopup
 import com.aryan.reader.SummarizationResult
 import com.aryan.reader.TtsSettingsSheet
+import com.aryan.reader.countWords
 import com.aryan.reader.epubreader.AutoScrollControls
+import com.aryan.reader.epubreader.DictionarySettingsDialog
+import com.aryan.reader.epubreader.ExternalDictionaryHelper
 import com.aryan.reader.fetchAiDefinition
 import com.aryan.reader.paginatedreader.TtsChunk
 import com.aryan.reader.pdf.data.AnnotationSettingsRepository
@@ -304,6 +309,29 @@ private const val PDF_AUTO_SCROLL_LOCAL_MAX_PREFIX = "pdf_as_local_max_"
 private const val PDF_SCROLL_LOCKED_PREFIX = "pdf_sl_local_"
 private const val PDF_FULL_SCREEN_PREFIX = "pdf_fs_local_"
 private const val PDF_MUSICIAN_MODE_KEY = "pdf_musician_mode_enabled"
+private const val PREF_USE_ONLINE_DICT = "use_online_dictionary"
+private const val PREF_EXTERNAL_DICT_PKG = "external_dictionary_package"
+
+private fun loadUseOnlineDict(context: Context): Boolean {
+    @Suppress("KotlinConstantConditions") if (BuildConfig.FLAVOR == "oss") return false
+    val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
+    return prefs.getBoolean(PREF_USE_ONLINE_DICT, true)
+}
+
+private fun saveUseOnlineDict(context: Context, useOnline: Boolean) {
+    val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
+    prefs.edit { putBoolean(PREF_USE_ONLINE_DICT, useOnline) }
+}
+
+private fun loadExternalDictPackage(context: Context): String? {
+    val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
+    return prefs.getString(PREF_EXTERNAL_DICT_PKG, null)
+}
+
+private fun saveExternalDictPackage(context: Context, packageName: String) {
+    val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
+    prefs.edit { putString(PREF_EXTERNAL_DICT_PKG, packageName) }
+}
 
 private fun savePdfMusicianMode(context: Context, isEnabled: Boolean) {
     val prefs = context.getSharedPreferences(SETTINGS_PREFS_NAME, Context.MODE_PRIVATE)
@@ -736,6 +764,10 @@ fun PdfViewerScreen(
     var currentTtsMode by remember { mutableStateOf(loadTtsMode(context)) }
     var showTtsSettingsSheet by remember { mutableStateOf(false) }
 
+    var showDictionarySettingsSheet by remember { mutableStateOf(false) }
+    var useOnlineDictionary by remember { mutableStateOf(loadUseOnlineDict(context)) }
+    var selectedDictPackage by remember { mutableStateOf(loadExternalDictPackage(context)) }
+
     var showDeviceVoiceSettingsSheet by remember { mutableStateOf(false) }
 
     fun triggerAutoScrollTempPause(durationMs: Long) {
@@ -1840,24 +1872,54 @@ fun PdfViewerScreen(
         { isLoading: Boolean -> isHighlightingLoading = isLoading }
     }
 
-    val onShowDictionaryUpsellDialogStable = remember { { showDictionaryUpsellDialog = true } }
+    val onShowDictionaryUpsellDialogStable = remember(useOnlineDictionary) {
+        {
+            if (useOnlineDictionary) {
+                showDictionaryUpsellDialog = true
+            }
+        }
+    }
 
-    val onWordSelectedForAiDefinitionStable = remember(isProUser, executeWithOcrCheck) {
+    val onDictionaryLookupStable = remember(isProUser, executeWithOcrCheck, useOnlineDictionary, selectedDictPackage) {
         { text: String ->
             executeWithOcrCheck {
-                selectedTextForAi = text
+                val isOss = BuildConfig.FLAVOR == "oss"
-                showAiDefinitionPopup = true
+                val effectiveUseOnline = !isOss && useOnlineDictionary
-                coroutineScope.launch {
+
-                    isAiDefinitionLoading = true
+                if (effectiveUseOnline) {
-                    aiDefinitionResult = null
+                    val wordCount = countWords(text)
-                    fetchAiDefinition(text = text, onUpdate = { chunk ->
+                    if (isProUser || wordCount <= 1) {
-                        val currentDefinition = aiDefinitionResult?.definition ?: ""
+                        selectedTextForAi = text
-                        aiDefinitionResult = AiDefinitionResult(
+                        showAiDefinitionPopup = true
-                            definition = currentDefinition + chunk
+                        coroutineScope.launch {
-                        )
+                            isAiDefinitionLoading = true
-                    }, onError = { error ->
+                            aiDefinitionResult = null
-                        aiDefinitionResult = AiDefinitionResult(error = error)
+                            fetchAiDefinition(
-                    }, onFinish = { isAiDefinitionLoading = false })
+                                text = text,
+                                onUpdate = { chunk ->
+                                    val currentDefinition = aiDefinitionResult?.definition ?: ""
+                                    aiDefinitionResult = AiDefinitionResult(
+                                        definition = currentDefinition + chunk
+                                    )
+                                },
+                                onError = { error ->
+                                    aiDefinitionResult = AiDefinitionResult(error = error)
+                                },
+                                onFinish = {
+                                    isAiDefinitionLoading = false
+                                }
+                            )
+                        }
+                    } else {
+                        showDictionaryUpsellDialog = true
+                    }
+                } else {
+                    if (selectedDictPackage != null) {
+                        ExternalDictionaryHelper.launchDictionary(context, selectedDictPackage!!, text)
+                    } else {
+                        Toast.makeText(context, "Please select a dictionary app first.", Toast.LENGTH_SHORT).show()
+                        showDictionarySettingsSheet = true
+                    }
                 }
             }
         }
@@ -3458,33 +3520,11 @@ fun PdfViewerScreen(
                                                 onSingleTap = onSingleTapStable,
                                                 isProUser = isProUser,
                                                 onShowDictionaryUpsellDialog = {
-                                                    showDictionaryUpsellDialog = true
+                                                    if (useOnlineDictionary) {
-                                                },
+                                                        showDictionaryUpsellDialog = true
-                                                onWordSelectedForAiDefinition = { text ->
-                                                    selectedTextForAi = text
-                                                    showAiDefinitionPopup = true
-                                                    coroutineScope.launch {
-                                                        isAiDefinitionLoading = true
-                                                        aiDefinitionResult = null
-                                                        fetchAiDefinition(
-                                                            text = text,
-                                                            onUpdate = { chunk ->
-                                                                val currentDefinition =
-                                                                    aiDefinitionResult?.definition ?: ""
-                                                                aiDefinitionResult = AiDefinitionResult(
-                                                                    definition = currentDefinition + chunk
-                                                                )
-                                                            },
-                                                            onError = { error ->
-                                                                aiDefinitionResult = AiDefinitionResult(
-                                                                    error = error
-                                                                )
-                                                            },
-                                                            onFinish = {
-                                                                isAiDefinitionLoading = false
-                                                            })
                                                     }
                                                 },
+                                                onWordSelectedForAiDefinition = onDictionaryLookupStable,
                                                 onOcrStateChange = onOcrStateChange,
                                                 onLinkClicked = { url -> clickedLinkUrl = url },
                                                 onInternalLinkClicked = onInternalLinkNav,
@@ -3846,7 +3886,7 @@ fun PdfViewerScreen(
                                             searchResultToHighlight = searchHighlightTarget,
                                             isProUser = isProUser,
                                             onShowDictionaryUpsellDialog = onShowDictionaryUpsellDialogStable,
-                                            onWordSelectedForAiDefinition = onWordSelectedForAiDefinitionStable,
+                                            onWordSelectedForAiDefinition = onDictionaryLookupStable,
                                             ttsHighlightData = ttsHighlightData,
                                             ttsReadingPage = ttsPageData?.pageIndex,
                                             onLinkClicked = onLinkClickedStable,
@@ -3940,7 +3980,7 @@ fun PdfViewerScreen(
                 }
 
                 if (isMusicianMode && isAutoScrollModeActive) {
-                    val density = LocalDensity.current
+                    @Suppress("UnusedVariable", "Unused") val density = LocalDensity.current
 
                     var leftPulseTrigger by remember { mutableLongStateOf(0L) }
                     var rightPulseTrigger by remember { mutableLongStateOf(0L) }
@@ -4345,6 +4385,14 @@ fun PdfViewerScreen(
                                     )
                                 }
 
+                                IconButton(onClick = { showDictionarySettingsSheet = true }) {
+                                    Icon(
+                                        painter = painterResource(id = R.drawable.dictionary),
+                                        contentDescription = "Dictionary Settings",
+                                        tint = MaterialTheme.colorScheme.onSurfaceVariant
+                                    )
+                                }
+
                                 if (BuildConfig.DEBUG) {
                                     IconButton(onClick = { showPenPlayground = true }) {
                                         Icon(
@@ -4453,11 +4501,7 @@ fun PdfViewerScreen(
                                                 showMoreMenu = false
                                                 isAutoScrollModeActive = true
                                                 isAutoScrollPlaying = true
-                                                showBars = if (isMusicianMode) {
+                                                showBars = !isMusicianMode
-                                                    false
-                                                } else {
-                                                    true
-                                                }
                                             }
                                         )
 
@@ -5741,7 +5785,17 @@ fun PdfViewerScreen(
                             selectedTextForAi = null
                             aiDefinitionResult = null
                         },
-                        isMainTtsActive = isTtsSessionActive
+                        isMainTtsActive = isTtsSessionActive,
+                        onOpenExternalDictionary = {
+                            selectedTextForAi?.let { text ->
+                                if (selectedDictPackage != null) {
+                                    ExternalDictionaryHelper.launchDictionary(context, selectedDictPackage!!, text)
+                                } else {
+                                    Toast.makeText(context, "Select an offline dictionary first.", Toast.LENGTH_SHORT).show()
+                                    showDictionarySettingsSheet = true
+                                }
+                            }
+                        }
                     )
                 }
                 if (showDictionaryUpsellDialog) {
@@ -5873,6 +5927,24 @@ fun PdfViewerScreen(
                     )
                 }
 
+                if (showDictionarySettingsSheet) {
+                    DictionarySettingsDialog(
+                        isVisible = true,
+                        onDismiss = { showDictionarySettingsSheet = false },
+                        isProUser = isProUser,
+                        useOnlineDictionary = useOnlineDictionary,
+                        onToggleOnlineDictionary = { newState ->
+                            useOnlineDictionary = newState
+                            saveUseOnlineDict(context, newState)
+                        },
+                        selectedPackageName = selectedDictPackage,
+                        onSelectPackage = { pkg ->
+                            selectedDictPackage = pkg
+                            saveExternalDictPackage(context, pkg)
+                        }
+                    )
+                }
+
                 if (showDeviceVoiceSettingsSheet) {
                     DeviceVoiceSettingsSheet(
                         isVisible = true,