fix(mobile): hold stored sessions across blank refetch

[iscekic]

Summary

The Agents tab session list no longer flashes an empty "No sessions yet" or "No past sessions" message during a background refresh.

The session list keeps its scroll position when a live session ends or when a rename, delete, or create settles.

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The stored session list now renders the last non-empty rows while reconcileFirstPage blanks the cache and refetches page one. The new resolveStoredSessionsHold contract and StoredSessionsHold type decide the render from the live rows, the fetch state, and the previous hold, scoped to the JSON-encoded infinite query key, so a filter or sort change still shows its skeleton instead of the previous filter's rows. The hold releases when the refetch settles with rows or with an empty result.

Files

• apps/mobile/src/lib/agent-session-render-hold.ts — adds the StoredSessionsHold type and the pure resolveStoredSessionsHold helper.
• apps/mobile/src/lib/hooks/use-agent-sessions.ts — computes the JSON query key, feeds the live rows and fetch state into the helper, stores the hold in a ref, and renders the resolved rows for date grouping and the returned storedSessions.

Tests: 2 files — apps/mobile/src/lib/agent-session-render-hold.test.ts (new) and apps/mobile/src/lib/query/infinite-retention.test.ts (updated).
Generated: none.

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Visual Changes

Agents tab session list (iOS). When a live session ends, the list keeps its history rows and scroll position, and no empty state appears. The clipped row under the TODAY header and the 22:41 history rows below it show the kept scroll position.

Verification

Two cases ran on iOS.

Case	What it proves	Platform	Result
s1	The list keeps its history rows and shows no empty state during the departure refetch, pull-to-refresh, and one poll cycle.	iOS	passed
s2	A list scrolled into the history keeps its position when the live session ends.	iOS	passed

The rounds reproduced no defect on an unfixed build; the fix was already in place, so no unfixed-build repro ran.
Recordings: /private/var/folders/pz/_kmbp8vs2755j415slh2hz100000gn/T/kilo-workflow-agents-list-stability-53a1.xPYOqS/e2e-verify-r1-BQRXsC/s1-blanking-refetch.mp4 and /private/var/folders/pz/_kmbp8vs2755j415slh2hz100000gn/T/kilo-workflow-agents-list-stability-53a1.xPYOqS/e2e-verify-r2-ANxpxY/s2-scroll-live-dead.mp4.

Reviewer Notes

No human steps are needed.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• apps/mobile/src/lib/agent-session-render-hold.ts
• apps/mobile/src/lib/agent-session-render-hold.test.ts
• apps/mobile/src/lib/hooks/use-agent-sessions.ts
• apps/mobile/src/lib/query/infinite-retention.test.ts

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_{Reviewed by grok-4.6 · Input: 200.7K · Output: 19.4K · Cached: 382.8K}

_{Review guidance: REVIEW.md from base branch main}