⚡ Bolt: Optimize BlogApp data fetching

[schmug]

💡 What: Deduplicated fetch requests in BlogApp by utilizing module-level fetchPromise and cachedPayload variables.
🎯 Why: Due to the OS shell architecture, windowed apps frequently mount/unmount when opened or closed, leading to redundant network calls for semi-static blog data.
📊 Impact: Reduces redundant blog fetches by 100% on app reopen.
🔬 Measurement: Validated through local tests ensuring zero additional fetches on repeated mounts.

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PR created automatically by Jules for task 3224717141260863816 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Superseded by #127 (merged to main), which consolidated the best of the duplicate Bolt/Sentinel/Palette scheduled-agent PRs into one reviewed change.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Superseded by #127 (merged to main), which consolidated the best of the duplicate Bolt/Sentinel/Palette scheduled-agent PRs into one reviewed change.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 Acknowledging that this work is superseded and closing the pull request.