perf(ui): align React Query cache between memory grid and graph

[ishaanxgupta]

Summary

Aligns the React Query caching strategy for the @post/documents/documents endpoint between the main Memory Grid and the Memory Graph UI.

Previously, use-graph-api.ts used a completely different queryKey (["graph-documents", ...]) and a short staleTime of 30 seconds, while memories-grid.tsx cached the same payload for 5 minutes under ["documents-with-memories", ...].

This mismatch resulted in the client ignoring its cache and blindly re-fetching identical document arrays when the user toggled the graph view, wasting network bandwidth and blocking the main thread on parsing duplicate JSON.

Changes

• Updated the queryKey in apps/web/components/memory-graph/hooks/use-graph-api.ts to ["documents-with-memories", containerTags, []].
• Increased the graph's staleTime from 30s to 5m to mirror the grid cache configuration.

Impact

• Fewer Network Calls: Zero redundant API requests when switching back and forth between the grid and the graph.
• Improved UX: Faster transition into the graph UI since data is instantly yielded from the cache.
• Lower CPU Usage: Avoids heavy main-thread document payload parsing on duplicate requests.