feat: ship v1.2.0 Wave 1 foundation with book settings, chapter management, and focus mode

Deliver schema v9, book/chapter IPC extensions, BookSettingsTab, chapter meta/tags,
AI session menu, focus mode and TTS, template context enrich, and Wave 1 E2E coverage.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main/ipc/register.ts

@@ -14,6 +14,7 @@ import { WritingSessionRepository } from '../db/repositories/writing-session.rep
 import { WritingSessionService } from '../services/writing-session.service'
 import { registerSettingsHandlers } from './handlers/settings.handler'
 import { registerBookHandlers } from './handlers/book.handler'
+import { registerBookPrefsHandlers } from './handlers/book-prefs.handler'
 import { registerChapterHandlers } from './handlers/chapter.handler'
 import { registerShortcutHandlers } from './handlers/shortcut.handler'
 import { registerOutlineHandlers } from './handlers/outline.handler'
@@ -69,6 +70,7 @@ export function registerIpc(): { settings: GlobalSettingsService; books: BookReg
 
   registerSettingsHandlers(settings)
   registerBookHandlers(books, writingSessions)
+  registerBookPrefsHandlers(books)
   registerChapterHandlers(books, writingLogs, writingSessions)
   registerShortcutHandlers(shortcutManager)
   registerOutlineHandlers(books)