fix(desktop): recover in-flight turn progress after restart

[OmarB97]

Summary

• add a bounded desktop in-flight turn journal that stores the active user plus assistant/tool tail locally during streaming
• recover the journal on session resume when the DB only has the initiating user prompt, and discard it when stored history has caught up
• consume the gateway session.resume/session.activate inflight payload so live running sessions rehydrate partial assistant text instead of opening blank

Task

• hermes-desktop-crash-survivable-turn-progress-20260611

Verification

• npm run test:ui -- src/lib/inflight-turn-journal.test.ts src/app/session/hooks/use-session-state-cache.test.tsx src/app/session/hooks/use-message-stream.test.tsx
• npx eslint src/lib/inflight-turn-journal.ts src/lib/inflight-turn-journal.test.ts src/app/session/hooks/use-session-state-cache.ts src/app/session/hooks/use-session-actions.ts src/types/hermes.ts
• npm run typecheck
• git -c core.fsmonitor=false diff --check

Notes

• This does not mutate model conversation history mid-turn, so prompt-cache and role-alternation behavior remain untouched.
• I did not swap /Applications/Hermes.app yet to avoid interrupting currently active sessions before the fixed build is installed intentionally.

[github-actions]

🔎 Lint report: fix/crash-survivable-turn-progress-20260611 vs origin/main

ruff

Total: 0 on HEAD, 0 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 0 pre-existing issues carried over.

ty (type checker)

Total: 10638 on HEAD, 10638 on base (➖ 0)

🆕 New issues: none

✅ Fixed issues: none

Unchanged: 5558 pre-existing issues carried over.

Diagnostics are surfaced as warnings — this check never fails the build.