feat: implement SWR in-memory navigation cache hook to prevent redundant firestore listener mounts

[nitishchaubeyy]

Description

Addresses #438 by mitigating excessive Firestore read charges caused by redundant listener tear-downs during same-session route navigation.

Key Additions

• FirestoreCacheContext.jsx: Created a dedicated Context-backed store that persists across route unmounts, managing custom TTL cache maps.
• useFirestoreCache Hook: Engineered a custom SWR (Stale-While-Revalidate) hook that immediately returns memory-cached query results for instant UI paint, whilst silently revalidating via getDocs in the background. It uses deep-comparison to trigger re-renders only if actual data mutates.
• GitRank.jsx Optimization: Successfully ripped out the expensive onSnapshot real-time listener and replaced it with a getDocs driven fetch function wrapped in the new caching layer. Included local state synchronization to ensure the infinite-scroll pagination (startAfter) logic remains functional within the cached bounds.
• App Shell Scope: Wrapped the overarching <AppRoutes /> inside the <FirestoreCacheProvider> to ensure the memory map is globally accessible for future pages.

Fixes #438

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Project	Deployment	Actions	Updated (UTC)
ranker-hub	Ready	Preview, Comment	Jun 11, 2026 9:16am