fix(mobile): clear chat badge when app returns to foreground

[iscekic]

Summary

Fixes a bug where the push-notification badge count stays stuck after the user receives a notification while the app is backgrounded on the chat screen.

Repro

1. Open a chat.
2. Send a message.
3. Background the app.
4. Agent replies → OS badge shows 1.
5. Foreground the app (chat screen is still focused).
6. Expected: badge clears to 0.
7. Actual: badge stays at 1 until you navigate away and back.

Root cause

markChatRead only had two triggers:

• useFocusEffect — fires on navigation focus change, not on app-state change.
• addNotificationReceivedListener — fires only when a notification arrives while the app is foregrounded.

A notification received while backgrounded hits neither, and the subsequent foreground doesn't re-run useFocusEffect because navigation focus never changed. Both the server row and OS badge stay at 1.

Fix

Register an AppState listener inside useFocusEffect. On active transition it calls markChatRead for the focused chat. The listener is scoped to focus — it's added when the chat gains focus and removed on blur/unmount, so it only fires for the chat the user is actually on.

Test plan

• Background app on chat screen → receive notification → foreground → badge clears to 0
• Receive notification for a different chat while on this chat → badge reflects unread from other chat after foreground
• Navigate away from chat → listener unregistered (no stray markChatRead calls)
• pnpm format && pnpm typecheck && pnpm lint && pnpm check:unused all pass

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• apps/mobile/src/components/kiloclaw/chat.tsx

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_{Reviewed by gpt-5.4-2026-03-05 · 149,617 tokens}