feat(reader): radical UI simplification — only 5 tools, no overflow menu

- epubOverflowMenuSections: removed CUSTOMIZE_TOOLBAR, HIDDEN_TOOLS,
  TAP_TO_TURN, VOLUME_SCROLL, PAGE_TURN_ANIM, KEEP_SCREEN_ON,
  VISUAL_OPTIONS, AUTO_SCROLL, TTS_SETTINGS, BOOK_REPLACEMENTS, FILE_INFO
- defaultReaderHiddenTools: hide everything except THEME, SLIDER, TOC,
  BOOKMARK, READING_MODE
- defaultReaderToolOrder: only THEME, TOC, SLIDER (top bar)
- defaultReaderBottomTools: only SLIDER, TOC (bottom bar)
- loadHiddenTools: merge new defaults into saved prefs on upgrade
- Result: reader shows only font/theme, navigation slider, chapters (TOC),
  bookmark, reading mode — like Myne/Book's Story
- ':app:assembleOssDebug' passes, APK deployed.

app/src/main/java/com/dueattendant149/bookreader/reader/epubreader/EpubReaderControls.kt

@@ -275,39 +275,40 @@ internal fun epubOverflowMenuSections(
     hasDeleteReflow: Boolean,
     hasFileInfo: Boolean = true
 ): List<EpubOverflowMenuSection> = buildList {
-    add(EpubOverflowMenuSection.CUSTOMIZE_TOOLBAR)
-    if (hasHiddenToolbarTools) add(EpubOverflowMenuSection.HIDDEN_TOOLS)
     if (hasToggleReflow) add(EpubOverflowMenuSection.VIEW_ORIGINAL_PDF)
     if (hasDeleteReflow) add(EpubOverflowMenuSection.DELETE_TEXT_VIEW)
     if (!hiddenTools.contains(ReaderTool.READING_MODE.name)) add(EpubOverflowMenuSection.READING_MODE)
     if (!hiddenTools.contains(ReaderTool.BOOKMARK.name)) add(EpubOverflowMenuSection.BOOKMARK)
-    if (!hiddenTools.contains(ReaderTool.TAP_TO_TURN.name)) add(EpubOverflowMenuSection.TAP_TO_TURN)
-    if (!hiddenTools.contains(ReaderTool.VOLUME_SCROLL.name)) add(EpubOverflowMenuSection.VOLUME_SCROLL)
-    if (!hiddenTools.contains(ReaderTool.PAGE_TURN_ANIM.name)) add(EpubOverflowMenuSection.PAGE_TURN_ANIM)
-    if (!hiddenTools.contains(ReaderTool.KEEP_SCREEN_ON.name)) add(EpubOverflowMenuSection.KEEP_SCREEN_ON)
-    if (!hiddenTools.contains(ReaderTool.VISUAL_OPTIONS.name)) add(EpubOverflowMenuSection.VISUAL_OPTIONS)
-    if (!hiddenTools.contains(ReaderTool.AUTO_SCROLL.name)) add(EpubOverflowMenuSection.AUTO_SCROLL)
-    if (!hiddenTools.contains(ReaderTool.BOOK_REPLACEMENTS.name)) add(EpubOverflowMenuSection.BOOK_REPLACEMENTS)
-    if (
-        !hiddenTools.contains(ReaderTool.TTS_SETTINGS.name) ||
-        !hiddenTools.contains(ReaderTool.TTS_REPLACEMENTS.name)
-    ) {
-        add(EpubOverflowMenuSection.TTS_SETTINGS)
-    }
-    if (hasFileInfo && !hiddenTools.contains(ReaderTool.FILE_INFO.name)) {
-        add(EpubOverflowMenuSection.FILE_INFO)
-    }
 }
 
 internal fun defaultReaderHiddenTools(): Set<String> = setOf(
     ReaderTool.SCREEN_ORIENTATION.name,
-    ReaderTool.BRIGHTNESS.name
+    ReaderTool.BRIGHTNESS.name,
+    ReaderTool.DICTIONARY.name,
+    ReaderTool.FORMAT.name,
+    ReaderTool.SEARCH.name,
+    ReaderTool.AI_FEATURES.name,
+    ReaderTool.TTS_CONTROLS.name,
+    ReaderTool.FILE_INFO.name,
+    ReaderTool.TAP_TO_TURN.name,
+    ReaderTool.VOLUME_SCROLL.name,
+    ReaderTool.PAGE_TURN_ANIM.name,
+    ReaderTool.KEEP_SCREEN_ON.name,
+    ReaderTool.VISUAL_OPTIONS.name,
+    ReaderTool.AUTO_SCROLL.name,
+    ReaderTool.TTS_SETTINGS.name,
+    ReaderTool.TTS_REPLACEMENTS.name,
+    ReaderTool.BOOK_REPLACEMENTS.name,
 )
 
-internal fun defaultReaderToolOrder(): List<ReaderTool> = ReaderTool.entries.toList()
+internal fun defaultReaderToolOrder(): List<ReaderTool> = listOf(
+    ReaderTool.THEME,
+    ReaderTool.TOC,
+    ReaderTool.SLIDER,
+)
 
 internal fun defaultReaderBottomTools(): Set<String> {
-    return ReaderTool.entries.filter { it.category == "Bottom Bar" }.map { it.name }.toSet()
+    return setOf(ReaderTool.SLIDER.name, ReaderTool.TOC.name)
 }
 
 internal fun buildReaderToolbarItems(

app/src/main/java/com/dueattendant149/bookreader/reader/epubreader/EpubReaderScreen.kt

@@ -380,6 +380,14 @@ private fun loadHiddenTools(context: Context): Set<String> {
         return minimalHidden
     }
 
+    // If saved tools don't include the new defaults, merge them in
+    val allShouldBeHidden = defaultReaderHiddenTools()
+    val merged = savedHiddenTools + allShouldBeHidden
+    if (merged != savedHiddenTools) {
+        prefs.edit { putStringSet(HIDDEN_TOOLS_KEY, merged) }
+        return merged
+    }
+
     return savedHiddenTools
 }