feature/startup screen

[codebude]

• Add startup loading screen
• Add release update check

[github-actions]

🧪 Test Results — 90bd874

✅ Backend (pytest) — 708 passed, 0 failed, 0 skipped (708 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 375 passed, 0 failed, 0 skipped (375 total)
✅ E2E (Playwright) — 54 passed, 0 failed, 0 skipped (54 total)

Summary: ✅ All 1191 tests passed

[github-actions]

🧪 Test Results — 7401616

✅ Backend (pytest) — 708 passed, 0 failed, 0 skipped (708 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 375 passed, 0 failed, 0 skipped (375 total)
✅ E2E (Playwright) — 0 passed, 0 failed, 0 skipped (0 total)

Summary: ✅ All 1137 tests passed