fix: handle localStorage errors

[Guflly]

Overview

Closes #634.

Guard the app's localStorage reads and writes so browsers that block storage do not break persistent state or recent searches.

What Changed

• Treat blocked reads as missing storage.
• Keep in-memory state updates when persistence fails.
• Return an empty recent-search list or skip the write when storage is unavailable.
• Add regression tests for all four production storage calls.

Other Notes

npm run lint:check, npm run format:check, npm run type:check, and all 6 Jest tests pass.

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