feat(w5): ship v2.0.0 platform sync, undo persistence, and updates

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

tests/main/log.service.test.ts

@@ -0,0 +1,35 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest'
+import { mkdtempSync, rmSync, existsSync, readFileSync } from 'fs'
+import { join } from 'path'
+import { tmpdir } from 'os'
+import { LogService } from '../../src/main/services/log.service'
+
+describe('LogService', () => {
+  let dir: string
+  let logs: LogService
+
+  beforeEach(() => {
+    dir = mkdtempSync(join(tmpdir(), 'bilin-log-'))
+    logs = new LogService(dir)
+  })
+
+  afterEach(() => {
+    rmSync(dir, { recursive: true, force: true })
+  })
+
+  it('UT-LOG-01: manual error writes to log file', () => {
+    logs.logManualError('UT-LOG-01 test error')
+    const logFile = join(dir, 'logs', 'bilin.log')
+    expect(existsSync(logFile)).toBe(true)
+    const content = readFileSync(logFile, 'utf-8')
+    expect(content).toContain('UT-LOG-01 test error')
+  })
+
+  it('detects crash flag from previous run', () => {
+    logs.markUncleanExit()
+    const next = new LogService(dir)
+    expect(next.hadCrashOnLastRun()).toBe(true)
+    next.clearCrashFlag()
+    expect(next.hadCrashOnLastRun()).toBe(false)
+  })
+})