fix(app): apply requested changes to settings page

[squeaky-duck-duck]

Summary

• Fix editor autosave dropping last edits: debounced localStorage write missed pending changes on unmount/tab close; now cache latest markdown in a ref and flush immediately on unmount and beforeunload.
• Restore settings.tsx to working state: prior version had an undefined handleSave reference, and styling that does not match the project
• Rewire settings form to controlled inputs (displayName/username/bio state) with saving/saveError state, handleSave posting to client.me.$patch, and disabled state on the button during save.

Type of change

• Bug fix
• Feature
• Refactor (no behavior change)
• Documentation
• Build / tooling / CI
• Other: _________

Verification

• pnpm -r typecheck passes
• pnpm -r build passes
• Manually verified in a browser (for UI / behavior changes)
• Followed the app layout conventions
• No new dependencies, or new dependencies are justified and AGPL-compatible
• Change does not violate any non-negotiable principle
• Documentation only, no changes to the codebase, so no tests required

[andyrodrigues30]

See contribution flow screen - use same styling and structure - don't use the exact StepperActionHeader component for the title of the pages but use the same styling and use only one Button - cta-pri for save button.

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	blue-api	f8d58fd	Jul 29 2026, 08:03 PM