feat(ui): Phase 3 Myne-style Material You 3 redesign

- Add Shapes.kt with rounded shape scheme (8-32dp corners) wired into AppTheme.
- BookshelfLibraryScreen: round cards (shapes.large), surfaceContainerLow, CenterAlignedTopAppBar, onSurfaceVariant labels, larger padding.
- ServerSettingsScreen: section cards with round shapes, scrollable, CenterAlignedTopAppBar.
- Dynamic color already enabled via AppTheme (Android 12+ dynamicColorScheme + materialkolor seed).
- ':app:assembleOssDebug' passes.

app/src/main/java/com/dueattendant149/bookreader/reader/ui/theme/Shapes.kt

@@ -0,0 +1,16 @@
+package org.dueattendant149.bookreader.ui.theme
+
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Shapes
+import androidx.compose.ui.unit.dp
+
+/**
+ * Myne-style Material You 3 shape scheme: generous rounded corners.
+ */
+val AppShapes = Shapes(
+    extraSmall = RoundedCornerShape(8.dp),
+    small = RoundedCornerShape(12.dp),
+    medium = RoundedCornerShape(16.dp),
+    large = RoundedCornerShape(24.dp),
+    extraLarge = RoundedCornerShape(32.dp),
+)

app/src/main/java/com/dueattendant149/bookreader/reader/ui/theme/Theme.kt

@@ -178,6 +178,7 @@ fun AppTheme(
     MaterialTheme(
         colorScheme = finalColorScheme,
         typography = appFontFamily?.let { AppTypography.withAppFontFamily(it) } ?: AppTypography,
+        shapes = AppShapes,
         content = content
     )
 }

app/src/main/java/org/dueattendant149/bookreader/ServerSettingsScreen.kt

@@ -1,21 +1,26 @@
 package org.dueattendant149.bookreader.bookshelf
 
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material3.Button
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -23,7 +28,6 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.text.input.PasswordVisualTransformation
-import androidx.compose.ui.text.input.VisualTransformation
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 
@@ -34,13 +38,13 @@ fun ServerSettingsScreen(
     onBackClick: () -> Unit,
 ) {
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
-    var bookshelfUrl by remember(uiState.bookshelfUrl) { androidx.compose.runtime.mutableStateOf(uiState.bookshelfUrl) }
-    var absUrl by remember(uiState.absUrl) { androidx.compose.runtime.mutableStateOf(uiState.absUrl) }
-    var absToken by remember(uiState.absToken) { androidx.compose.runtime.mutableStateOf(uiState.absToken) }
+    var bookshelfUrl by remember(uiState.bookshelfUrl) { mutableStateOf(uiState.bookshelfUrl) }
+    var absUrl by remember(uiState.absUrl) { mutableStateOf(uiState.absUrl) }
+    var absToken by remember(uiState.absToken) { mutableStateOf(uiState.absToken) }
 
     Scaffold(
         topBar = {
-            TopAppBar(
+            androidx.compose.material3.CenterAlignedTopAppBar(
                 title = { Text("Server settings") },
                 navigationIcon = {
                     IconButton(onClick = onBackClick) {
@@ -54,10 +58,11 @@ fun ServerSettingsScreen(
             modifier = Modifier
                 .fillMaxSize()
                 .padding(padding)
-                .padding(16.dp)
+                .padding(horizontal = 16.dp, vertical = 8.dp)
+                .verticalScroll(rememberScrollState()),
+            verticalArrangement = Arrangement.spacedBy(16.dp)
         ) {
-            Text("Bookshelf API")
-            Spacer(modifier = Modifier.height(8.dp))
+            SettingsSectionCard(title = "Bookshelf API") {
                 OutlinedTextField(
                     value = bookshelfUrl,
                     onValueChange = {
@@ -68,11 +73,9 @@ fun ServerSettingsScreen(
                     singleLine = true,
                     modifier = Modifier.fillMaxWidth()
                 )
+            }
 
-            Spacer(modifier = Modifier.height(24.dp))
-
-            Text("Audiobookshelf")
-            Spacer(modifier = Modifier.height(8.dp))
+            SettingsSectionCard(title = "Audiobookshelf") {
                 OutlinedTextField(
                     value = absUrl,
                     onValueChange = {
@@ -83,7 +86,7 @@ fun ServerSettingsScreen(
                     singleLine = true,
                     modifier = Modifier.fillMaxWidth()
                 )
-            Spacer(modifier = Modifier.height(8.dp))
+                Spacer(modifier = Modifier.height(12.dp))
                 OutlinedTextField(
                     value = absToken,
                     onValueChange = {
@@ -95,20 +98,47 @@ fun ServerSettingsScreen(
                     visualTransformation = PasswordVisualTransformation(),
                     modifier = Modifier.fillMaxWidth()
                 )
-
-            Spacer(modifier = Modifier.height(24.dp))
+            }
 
             Button(
                 onClick = viewModel::save,
-                modifier = Modifier.fillMaxWidth()
+                modifier = Modifier.fillMaxWidth(),
+                shape = MaterialTheme.shapes.large
             ) {
                 Text("Save")
             }
 
             if (uiState.saved) {
-                Spacer(modifier = Modifier.height(8.dp))
-                Text("Saved")
+                Text(
+                    "Saved",
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.primary
+                )
             }
         }
     }
 }
+
+@Composable
+private fun SettingsSectionCard(
+    title: String,
+    content: @Composable () -> Unit,
+) {
+    Card(
+        modifier = Modifier.fillMaxWidth(),
+        shape = MaterialTheme.shapes.large,
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surfaceContainerLow
+        )
+    ) {
+        Column(modifier = Modifier.padding(20.dp)) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.titleMedium,
+                color = MaterialTheme.colorScheme.primary,
+                modifier = Modifier.padding(bottom = 12.dp)
+            )
+            content()
+        }
+    }
+}

app/src/main/java/org/dueattendant149/bookreader/bookshelf/BookshelfLibraryScreen.kt

@@ -19,7 +19,6 @@ import androidx.compose.material3.LinearProgressIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -56,7 +55,7 @@ fun BookshelfLibraryScreen(
 
     Scaffold(
         topBar = {
-            TopAppBar(
+            androidx.compose.material3.CenterAlignedTopAppBar(
                 title = { Text("Server Library") },
                 actions = {
                     IconButton(onClick = onOpenSettings) {
@@ -145,9 +144,13 @@ private fun LibraryCard(
         onClick = onClick,
         modifier = Modifier
             .fillMaxWidth()
-            .padding(vertical = 4.dp)
+            .padding(vertical = 6.dp),
+        shape = MaterialTheme.shapes.large,
+        colors = androidx.compose.material3.CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surfaceContainerLow
+        )
     ) {
-        Column(modifier = Modifier.padding(16.dp)) {
+        Column(modifier = Modifier.padding(20.dp)) {
             Text(
                 text = library.name,
                 style = MaterialTheme.typography.titleMedium,
@@ -156,7 +159,9 @@ private fun LibraryCard(
             )
             Text(
                 text = "${library.itemCount} items · ${library.mediaType}",
-                style = MaterialTheme.typography.bodySmall
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(top = 4.dp)
             )
         }
     }
@@ -172,9 +177,13 @@ private fun ItemCard(
         onClick = onClick,
         modifier = Modifier
             .fillMaxWidth()
-            .padding(vertical = 4.dp)
+            .padding(vertical = 6.dp),
+        shape = MaterialTheme.shapes.large,
+        colors = androidx.compose.material3.CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surfaceContainerLow
+        )
     ) {
-        Column(modifier = Modifier.padding(16.dp)) {
+        Column(modifier = Modifier.padding(20.dp)) {
             Text(
                 text = item.title,
                 style = MaterialTheme.typography.titleMedium,
@@ -184,16 +193,29 @@ private fun ItemCard(
             if (item.author.isNotBlank()) {
                 Text(
                     text = item.author,
-                    style = MaterialTheme.typography.bodyMedium
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    modifier = Modifier.padding(top = 4.dp)
                 )
             }
             Text(
                 text = item.type,
-                style = MaterialTheme.typography.bodySmall
+                style = MaterialTheme.typography.labelSmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.padding(top = 4.dp)
             )
             if (isDownloading) {
-                LinearProgressIndicator(modifier = Modifier.fillMaxWidth().padding(top = 8.dp))
-                Text("Downloading...", style = MaterialTheme.typography.bodySmall)
+                LinearProgressIndicator(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(top = 12.dp),
+                )
+                Text(
+                    "Downloading...",
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.primary,
+                    modifier = Modifier.padding(top = 4.dp)
+                )
             }
         }
     }