feat(lanes): full-width Changes, Stage all, one-read expand-all
- The Changes panel's width control gains a full-width step (narrow → 50/50 → 70/30 → full → closed); the console beside it is hidden with CSS, never unmounted. - "Expand all folders" is one GET /api/lanes/:id/git/tree-all (one `git ls-files`, every level shaped like /git/tree) instead of one request and one git process per folder. - Overview: a Stage all button and the staged-only commit box sit above the file list and stay pinned while it scrolls; the Files finder is pinned too.
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