feat: ship v1.0.0 with character graph and writing analytics

Add P7 Cytoscape relationship graph with setting CRUD, P9 cockpit analytics driven by writing_sessions, chapter POV selection, and full test coverage.

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

src/main/ipc/handlers/book.handler.ts

@@ -2,9 +2,15 @@ import { ipcMain } from 'electron'
 import { IPC } from '../../../shared/ipc-channels'
 import type { BookMeta, CreateBookParams } from '../../../shared/types'
 import { BookRegistryService } from '../../services/book-registry'
+import type { WritingSessionService } from '../../services/writing-session.service'
 import { wrap } from '../result'
 
-export function registerBookHandlers(registry: BookRegistryService): void {
+let previousBookId: string | null = null
+
+export function registerBookHandlers(
+  registry: BookRegistryService,
+  writingSessions?: WritingSessionService
+): void {
   ipcMain.handle(IPC.BOOK_LIST, () => wrap(() => registry.list()))
 
   ipcMain.handle(IPC.BOOK_CREATE, (_event, params: CreateBookParams) =>
@@ -18,7 +24,13 @@ export function registerBookHandlers(registry: BookRegistryService): void {
   )
 
   ipcMain.handle(IPC.BOOK_OPEN, (_event, { bookId }: { bookId: string }) =>
-    wrap(() => registry.open(bookId))
+    wrap(() => {
+      if (writingSessions && previousBookId && previousBookId !== bookId) {
+        writingSessions.endActive(previousBookId)
+      }
+      previousBookId = bookId
+      return registry.open(bookId)
+    })
   )
 
   ipcMain.handle(