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/2026-02-18_merge-pr979-silent-indexing.md

@@ -0,0 +1,39 @@
+# Merge PR #979: Silent Pre-Indexing + Indexing Display Setting
+
+**Date:** 2026-02-18
+**Branch:** `mod/merge-upstream-pr-979`
+
+## Task Description
+
+Merged upstream PR #979 (silent pre-indexing for the next chapter) and implemented both "Possible Improvements" from the PR:
+1. A user setting to choose between Popup, Status Bar Text, or Status Bar Icon for indexing feedback.
+2. Status bar indicator rendering during silent pre-indexing.
+
+## Changes Made
+
+### PR #979 Cherry-Pick (2 files)
+- **`src/activities/reader/EpubReaderActivity.h`** -- Added `silentIndexNextChapterIfNeeded()` method declaration and `silentIndexingActive` flag.
+- **`src/activities/reader/EpubReaderActivity.cpp`** -- Moved viewport dimension calculations before the `!section` block. Added `silentIndexNextChapterIfNeeded()` implementation that pre-indexes the next chapter when the penultimate page is displayed.
+
+### New "Indexing Display" Setting (5 files)
+- **`src/CrossPointSettings.h`** -- Added `INDEXING_DISPLAY` enum (POPUP, STATUS_TEXT, STATUS_ICON) and `indexingDisplay` field.
+- **`src/CrossPointSettings.cpp`** -- Added persistence (write/read) for the new setting at the end of the settings chain.
+- **`src/SettingsList.h`** -- Registered the new Enum setting in the Display category.
+- **`lib/I18n/I18nKeys.h`** -- Added 4 new string IDs: `STR_INDEXING_DISPLAY`, `STR_INDEXING_POPUP`, `STR_INDEXING_STATUS_TEXT`, `STR_INDEXING_STATUS_ICON`.
+- **`lib/I18n/translations/*.yaml`** (8 files) -- Added translations for all 8 languages.
+
+### Status Bar Indicator Implementation
+- **`EpubReaderActivity.cpp`** -- Conditional popup logic: only shows popup when setting is POPUP; for STATUS_TEXT/STATUS_ICON, shows centered "Indexing..." text on blank screen during non-silent indexing. For silent pre-indexing, sets `silentIndexingActive` flag before rendering so `renderStatusBar()` draws the indicator (text or 8x8 hourglass icon) in the status bar.
+- Defined an 8x8 1-bit hourglass bitmap icon (`kIndexingIcon`) for the icon mode.
+
+## Build Verification
+
+- PlatformIO build: SUCCESS
+- RAM: 31.1% (101,820 / 327,680 bytes)
+- Flash: 99.6% (6,525,028 / 6,553,600 bytes)
+
+## Follow-Up Items
+
+- Test on device: verify silent indexing triggers on penultimate page, verify all three display modes work correctly.
+- The status bar indicator shows optimistically on penultimate pages even if the next chapter is already cached (false positive clears immediately after `loadSectionFile` check).
+- Flash usage is at 99.6% -- monitor for future additions.