ZhenYi 309bc50e86 perf(room): prioritize IndexedDB cache for instant loads ... - Remove clearRoomMessages on room switch: IDB cache now persists across visits, enabling instant re-entry without API round-trip - Increase initial API limit from 50 → 200: more messages cached upfront - Add loadOlderMessagesFromIdb: uses 'by_room_seq' compound index to serve scroll-back history from IDB without API call - loadMore now tries IDB first before falling back to API		2026-04-17 21:36:55 +08:00
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indexed-db.ts	perf(room): prioritize IndexedDB cache for instant loads	2026-04-17 21:36:55 +08:00