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

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Commits on Mar 5, 2026

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

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triadastra
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Apply clippy fixes: collapse redundant if-statements

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

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Copilot
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