⚡ Bolt: cache blog fetch for instant open

[schmug]

💡 What: Added a module-level cache (fetchPromise and cachedPayload) to BlogApp.tsx.
🎯 Why: In the OS-like interface, opening and closing apps unmounts the component, causing the local useEffect to fetch data anew every time.
📊 Impact: Reduces network requests by 100% on subsequent opens of the Blog app, allowing it to load instantly from memory instead of hitting the network.
🔬 Measurement: Open the "Blog" app, close it, and open it again. There will be no second network request in the DevTools Network tab, and the UI will paint immediately. Run pnpm test to verify no regressions in functionality.

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PR created automatically by Jules for task 11050106541366329621 started by @schmug

[google-labs-jules]

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[schmug]

Superseded by #127 (merged to main), which consolidated the best of the duplicate Bolt/Sentinel/Palette scheduled-agent PRs into one reviewed change. Closing as duplicate.

[google-labs-jules]

Superseded by #127 (merged to main), which consolidated the best of the duplicate Bolt/Sentinel/Palette scheduled-agent PRs into one reviewed change. Closing as duplicate.

Understood. Acknowledging that this work has been superseded and is now obsolete. Stopping work on this task.