Merge main + resolve 38 conflicts; combine best of both UI improvement branches#2

Draft

Copilot wants to merge 3 commits intomainfrom

copilot/improve-ui-ux

Commits on Mar 5, 2026

Improve UI/UX: icons, grouped toolbar, clearer repo chips, sectioned Changes tab, better footer

Copilot
and
triadastra
committed
Apply clippy fixes: collapse redundant if-statements

Copilot
and
triadastra
committed
Resolve all 38 merge conflicts in src/app.rs

Copilot
and
Copilot
committed