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

src/activities/home/BookManageMenuActivity.cpp

@@ -0,0 +1,118 @@
+#include "BookManageMenuActivity.h"
+
+#include <GfxRenderer.h>
+#include <I18n.h>
+
+#include "ActivityResult.h"
+#include "MappedInputManager.h"
+#include "components/UITheme.h"
+#include "fontIds.h"
+
+void BookManageMenuActivity::buildMenuItems() {
+  menuItems.clear();
+  if (archived) {
+    menuItems.push_back({Action::UNARCHIVE, StrId::STR_UNARCHIVE_BOOK});
+  } else {
+    menuItems.push_back({Action::ARCHIVE, StrId::STR_ARCHIVE_BOOK});
+  }
+  menuItems.push_back({Action::DELETE, StrId::STR_DELETE_BOOK});
+  menuItems.push_back({Action::DELETE_CACHE, StrId::STR_DELETE_CACHE_ONLY});
+  menuItems.push_back({Action::REINDEX, StrId::STR_REINDEX_BOOK});
+}
+
+void BookManageMenuActivity::onEnter() {
+  Activity::onEnter();
+  selectedIndex = 0;
+  requestUpdate();
+}
+
+void BookManageMenuActivity::onExit() { Activity::onExit(); }
+
+void BookManageMenuActivity::loop() {
+  // Long-press detection: REINDEX_FULL when long-pressing on the Reindex item
+  if (mappedInput.isPressed(MappedInputManager::Button::Confirm) && mappedInput.getHeldTime() >= LONG_PRESS_MS) {
+    if (!ignoreNextConfirmRelease && selectedIndex < static_cast<int>(menuItems.size()) &&
+        menuItems[selectedIndex].action == Action::REINDEX) {
+      ignoreNextConfirmRelease = true;
+      setResult(MenuResult{.action = static_cast<int>(Action::REINDEX_FULL)});
+      finish();
+      return;
+    }
+  }
+
+  buttonNavigator.onNext([this] {
+    selectedIndex = ButtonNavigator::nextIndex(selectedIndex, static_cast<int>(menuItems.size()));
+    requestUpdate();
+  });
+
+  buttonNavigator.onPrevious([this] {
+    selectedIndex = ButtonNavigator::previousIndex(selectedIndex, static_cast<int>(menuItems.size()));
+    requestUpdate();
+  });
+
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    if (ignoreNextConfirmRelease) {
+      ignoreNextConfirmRelease = false;
+      return;
+    }
+    if (selectedIndex < static_cast<int>(menuItems.size())) {
+      setResult(MenuResult{.action = static_cast<int>(menuItems[selectedIndex].action)});
+      finish();
+      return;
+    }
+  }
+
+  if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
+    ActivityResult r;
+    r.isCancelled = true;
+    setResult(std::move(r));
+    finish();
+    return;
+  }
+}
+
+void BookManageMenuActivity::render(RenderLock&&) {
+  renderer.clearScreen();
+
+  const auto pageWidth = renderer.getScreenWidth();
+  const auto pageHeight = renderer.getScreenHeight();
+
+  constexpr int popupMargin = 20;
+  constexpr int lineHeight = 30;
+  constexpr int titleHeight = 40;
+  const int optionCount = static_cast<int>(menuItems.size());
+  const int popupH = titleHeight + popupMargin + lineHeight * optionCount + popupMargin;
+  const int popupW = pageWidth - 60;
+  const int popupX = (pageWidth - popupW) / 2;
+  const int popupY = (pageHeight - popupH) / 2;
+
+  // Popup border and background
+  renderer.fillRect(popupX - 2, popupY - 2, popupW + 4, popupH + 4, true);
+  renderer.fillRect(popupX, popupY, popupW, popupH, false);
+
+  // Title
+  renderer.drawText(UI_12_FONT_ID, popupX + popupMargin, popupY + 8, tr(STR_MANAGE_BOOK), true, EpdFontFamily::BOLD);
+
+  // Divider line
+  const int dividerY = popupY + titleHeight;
+  renderer.fillRect(popupX + 4, dividerY, popupW - 8, 1, true);
+
+  // Menu items
+  const int startY = dividerY + popupMargin / 2;
+  for (int i = 0; i < optionCount; ++i) {
+    const int itemY = startY + i * lineHeight;
+    const bool isSelected = (i == selectedIndex);
+
+    if (isSelected) {
+      renderer.fillRect(popupX + 2, itemY, popupW - 4, lineHeight, true);
+    }
+
+    renderer.drawText(UI_10_FONT_ID, popupX + popupMargin, itemY, I18N.get(menuItems[i].labelId), !isSelected);
+  }
+
+  // Button hints
+  const auto labels = mappedInput.mapLabels(tr(STR_CANCEL), tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
+  GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);
+
+  renderer.displayBuffer();
+}