feat: ship v0.9.0 with pomodoro, achievements, and injection history

Add pomodoro timer with goal notifications, writing streak milestones, and knowledge injection logging with UI previews across AI writing flows.

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

tests/main/migrate-v8.test.ts

@@ -0,0 +1,27 @@
+import { describe, it, expect, afterEach } from 'vitest'
+import { DatabaseSync } from 'node:sqlite'
+import { migrate } from '../../src/main/db/migrate'
+import type { SqliteDb } from '../../src/main/db/types'
+
+describe('migrate v8', () => {
+  let db: SqliteDb
+  afterEach(() => db?.close())
+
+  it('UT-MIG-08: v7 database migrates to v8 with injection table', () => {
+    db = new DatabaseSync(':memory:')
+    migrate(db)
+    const version = db.prepare('SELECT MAX(version) AS v FROM schema_version').get() as { v: number }
+    expect(version.v).toBe(8)
+    const table = db
+      .prepare(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='knowledge_injection_logs'"
+      )
+      .get()
+    expect(table).toBeTruthy()
+    const cols = db.prepare('PRAGMA table_info(knowledge_injection_logs)').all() as Array<{
+      name: string
+    }>
+    expect(cols.some((c) => c.name === 'knowledge_entry_id')).toBe(true)
+    expect(cols.some((c) => c.name === 'flow_mode')).toBe(true)
+  })
+})