feat: ship v0.8.0 with writing logs and AI knowledge extraction

Deliver P5.2 writing day logs, cockpit heatmap, streak tracking, and chapter knowledge auto-extraction with merge review.

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

tests/main/knowledge.service.test.ts

@@ -58,4 +58,29 @@ describe('KnowledgeService', () => {
     expect(service.batchApprove(ids)).toBe(3)
     expect(service.countPending()).toBe(0)
   })
+
+  it('IT-EXT-03: approveMerge updates target and rejects pending', () => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+    const service = new KnowledgeService(db)
+    const target = service.create({
+      type: 'character',
+      title: '林凡',
+      content: '少年',
+      status: 'approved'
+    })
+    const pending = service.create({
+      type: 'character',
+      title: '林凡（更新）',
+      content: '筑基期修士',
+      status: 'pending'
+    })
+    db.prepare('UPDATE knowledge_entries SET merge_target_id = ? WHERE id = ?').run(
+      target.id,
+      pending.id
+    )
+    const updated = service.approveMerge(pending.id)
+    expect(updated.content).toBe('筑基期修士')
+    expect(service.list({ status: 'pending' })).toHaveLength(0)
+  })
 })