v0.6.0 — UI Polish & Settings Cleanup

What's new

• Text zoom controls moved from composer toolbar to Settings > Advanced > Look & Feel (with A-/A+ buttons + slider)
• Plan drawer minimized by default — plans start collapsed, expand on user click
• Interleaved thinking — reasoning blocks appear inline with content flow instead of pinned to the top
• Composer tightened — reduced bottom padding for more vertical space
• Advanced settings reorganized — Look & Feel first (open by default), logical section ordering, Danger Zone collapsed by default
• TypeScript fix for queued message banner null check