Add favorites dropdown to the sidebar

[BunsDev]

Summary

• Adds a new sidebar favorites dropdown for viewing, adding, and removing saved items.
• Persists favorites in app settings with schema validation and sensible defaults.
• Caps favorite length and total count to keep the list bounded and predictable.

Testing

• Not run (PR summary only).
• Suggested checks: verify the sidebar renders the new Faves entry and dropdown interactions work for add/remove flows.
• Suggested checks: run bun fmt, bun lint, and bun typecheck before merging.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
okcode-marketing	Error		Apr 1, 2026 1:30pm
v0-compute-the-platform-to-build	Ready	Preview, Open in v0	Apr 1, 2026 1:30pm