mod: Phase 1 - bring forward mod-exclusive files with ActivityManager migration

Brings ~55 mod-exclusive files to the upstream-based mod/master-resync branch:

Activities (migrated to new ActivityManager pattern):
- Clock/Time: SetTimeActivity, SetTimezoneOffsetActivity, NtpSyncActivity
- Dictionary: DictionaryDefinitionActivity, DictionarySuggestionsActivity,
  DictionaryWordSelectActivity, LookedUpWordsActivity
- Bookmark: EpubReaderBookmarkSelectionActivity
- Book management: BookManageMenuActivity, EndOfBookMenuActivity
- OPDS: OpdsServerListActivity, OpdsSettingsActivity
- Utility: DirectoryPickerActivity, NumericStepperActivity

Utilities (unchanged):
- BookManager, BookSettings, BookmarkStore, BootNtpSync
- Dictionary, LookupHistory, TimeSync, OpdsServerStore

Libraries: PlaceholderCover, TableData, ChapterXPathIndexer
Scripts: inject_mod_version, generate_book_icon, preview_placeholder_cover
Docs: KOReader sync XPath mapping

Migration changes:
- ActivityWithSubactivity -> Activity base class
- Callback constructors -> finish()/setResult() pattern
- enterNewActivity() -> startActivityForResult()
- Activity::RenderLock&& -> RenderLock&&

These files won't compile yet - they reference mod settings and I18n
strings that will be added in subsequent phases.

Made-with: Cursor

chat-summaries/2026-02-16_19-30-summary.md

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+# Reader Menu Improvements
+
+## Task
+Overhaul the EPUB reader menu: consolidate dictionary actions behind long-press, add portrait/landscape toggle with preferred-orientation settings, add font size cycling, and rename several menu labels.
+
+## Changes Made
+
+### 1. Consolidated Dictionary Menu Items
+- Removed "Lookup Word History" and "Delete Dictionary Cache" from the reader menu
+- Long-pressing Confirm on "Lookup Word" now opens the Lookup History screen
+- "Delete Dictionary Cache" moved to a sentinel entry at the bottom of the Lookup History word list
+
+**Files:** `EpubReaderMenuActivity.h`, `EpubReaderMenuActivity.cpp`, `LookedUpWordsActivity.h`, `LookedUpWordsActivity.cpp`, `EpubReaderActivity.cpp`
+
+### 2. Toggle Portrait/Landscape
+- Renamed "Reading Orientation" to "Toggle Portrait/Landscape" in the reader menu (kept the original name in global Settings)
+- Short-press now toggles between preferred portrait and preferred landscape orientations
+- Long-press opens a popup sub-menu with all 4 orientation options
+- Added `preferredPortrait` and `preferredLandscape` settings to `CrossPointSettings` (serialized at end for backward-compat)
+- Added corresponding settings to `SettingsList.h` using `DynamicEnum` (maps non-sequential enum values correctly)
+
+**Files:** `CrossPointSettings.h`, `CrossPointSettings.cpp`, `SettingsList.h`, `EpubReaderMenuActivity.h`, `EpubReaderMenuActivity.cpp`
+
+### 3. Toggle Font Size
+- Added new `TOGGLE_FONT_SIZE` menu action
+- Cycles through Small → Medium → Large → Extra Large → Small on each press
+- Shows current size value next to the label (like orientation)
+- Applied on menu exit via extended `onBack` callback `(uint8_t orientation, uint8_t fontSize)`
+- Added `applyFontSize()` to `EpubReaderActivity` (saves to settings, resets section for re-layout)
+
+**Files:** `EpubReaderMenuActivity.h`, `EpubReaderMenuActivity.cpp`, `EpubReaderActivity.h`, `EpubReaderActivity.cpp`
+
+### 4. Label Renames
+- "Letterbox Fill" → "Override Letterbox Fill" (reader menu only; global setting keeps original name)
+- "Sync Progress" → "Sync Reading Progress"
+
+**Files:** `english.yaml` (I18n source), regenerated `I18nKeys.h`, `I18nStrings.h`, `I18nStrings.cpp`
+
+### 5. Long-Press Safety
+- Added `ignoreNextConfirmRelease` flag to `EpubReaderMenuActivity` to prevent stale releases
+- Added `initialSkipRelease` constructor parameter to `LookedUpWordsActivity`
+- Extended `ignoreNextConfirmRelease` guard to cover the word-selection path (not just delete-confirm mode)
+- Orientation sub-menu also uses `ignoreNextConfirmRelease` to avoid selecting on long-press release
+
+### 6. New I18n Strings
+- `STR_TOGGLE_ORIENTATION`: "Toggle Portrait/Landscape"
+- `STR_TOGGLE_FONT_SIZE`: "Toggle Font Size"
+- `STR_OVERRIDE_LETTERBOX_FILL`: "Override Letterbox Fill"
+- `STR_PREFERRED_PORTRAIT`: "Preferred Portrait"
+- `STR_PREFERRED_LANDSCAPE`: "Preferred Landscape"
+
+## Build Status
+Successfully compiled (default environment). RAM: 31.1%, Flash: 99.4%.
+
+## Follow-up Items
+- Translations: New strings fall back to English for all non-English languages. Translators can add entries to their respective YAML files.
+- The `SettingInfo::Enum` approach doesn't work for non-sequential enum values (portrait=0, inverted=2). Used `DynamicEnum` with getter/setter lambdas instead.