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/2026-02-17_long-press-confirm-toc.md

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+# Long-Press Confirm to Open Table of Contents
+
+**Date**: 2026-02-17
+**Branch**: mod/improve-home-screen
+
+## Task
+
+Add long-press detection on the Confirm button while reading an EPUB to directly open the Table of Contents (chapter selection), bypassing the reader menu. Short press retains existing behavior (opens menu).
+
+## Changes Made
+
+### `src/activities/reader/EpubReaderActivity.h`
+- Added `bool ignoreNextConfirmRelease` member to suppress short-press after a long-press Confirm
+- Added `void openChapterSelection()` private method declaration
+
+### `src/activities/reader/EpubReaderActivity.cpp`
+- Added `constexpr unsigned long longPressConfirmMs = 700` threshold constant
+- Extracted `openChapterSelection()` helper method from the duplicated `EpubReaderChapterSelectionActivity` construction code
+- Added long-press Confirm detection in `loop()` (before the existing short-press check): opens TOC directly if `epub->getTocItemsCount() > 0`
+- Refactored `onReaderMenuConfirm(SELECT_CHAPTER)` to use the new helper (was ~35 lines of inline construction)
+- Refactored `onReaderMenuConfirm(GO_TO_BOOKMARK)` fallback (no bookmarks + TOC available) to use the same helper
+- Reset `ignoreNextConfirmRelease` when `skipNextButtonCheck` clears, to avoid stale state across subactivity transitions
+
+### `src/activities/reader/EpubReaderChapterSelectionActivity.h`
+- Added `bool ignoreNextConfirmRelease` member
+- Added `initialSkipRelease` constructor parameter (default `false`) to consume stale Confirm release when opened via long-press
+
+### `src/activities/reader/EpubReaderChapterSelectionActivity.cpp`
+- Added guard in `loop()` to skip the first Confirm release when `ignoreNextConfirmRelease` is true
+
+## Pattern Used
+
+Follows the existing Back button short/long-press pattern: `isPressed() + getHeldTime() >= threshold` for long press, `wasReleased()` for short press, with `ignoreNextConfirmRelease` flag (same pattern as `EpubReaderMenuActivity`, `LookedUpWordsActivity`, and other activities).
+
+## Follow-up Items
+
+- None identified