[Peace-001]

Summary

Closes #895

Implements local AsyncStorage caching for the home feed so content is visible instantly on app startup, before any network request completes.

What changed

mobileapp/app/(personal)/home.tsx

• Added FEED_CACHE_KEY = "feed_items_cache" constant.
• On mount, the useEffect now runs a two-phase load:
  1. Cache phase — reads feed_items_cache from AsyncStorage and immediately populates the feed state so users see content with zero network latency.
  2. Network phase — fetches fresh data from the backend (fetchFeed), updates the feed state, and writes the result back to AsyncStorage for the next launch.
• Pull-to-refresh (onPullRefresh) also writes the latest data back to the cache.
• All errors (corrupt cache JSON, network failure, empty response) are handled gracefully — the last known good data stays visible.

mobileapp/__tests__/homeCache.test.tsx (new)

Seven focused tests covering every path through the caching logic:

#	Scenario	Assertion
1	Cache hit on mount	Cached items rendered before network responds
2	Successful network fetch	Fresh items replace cached items
3	Empty cache	Falls back to INITIAL_FEED without crashing
4	AsyncStorage.getItem throws	Error swallowed; INITIAL_FEED shown
5	Write-back after fetch	Fresh items persisted to AsyncStorage
6	Network fetch throws	Cached items remain visible; cache unchanged
7	Network returns []	Existing cache not overwritten

Acceptance criteria

• Cached items load immediately on mount (before network)
• Fresh data fetched and displayed after cache hydration
• Cache updated after every successful fetch
• All error paths handled without crashing or data loss

Testing

cd mobileapp
npx jest --testPathPattern="homeCache" --runInBand

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[ONEONUORA]

Great job @Peace-001