The floating Git panel — opened from the View menu — shows branch,
working-tree status and recent commits, and offers commit / refresh /
pull plus one-click branch switching. Clicking the status line, a
commit row or a conflicted file opens an in-panel scrollable
unified-diff viewer (the panel widens to 620 px with ▲/▼/✕ controls
and per-line colouring). Each non-current branch row carries a "⤵"
button that requests an isolated worktree merge.
GitPanelState / GitDiffView / GitPanelAction are plain data on
op-editor-core so the widget layer stays wasm-clean — it never calls
git itself. Diff rendering is split into git_panel_diff.rs and the
native press dispatch into git_press.rs to honour the 800-line cap;
the panel is hit-tested before the right-rail blocks so its wide
diff mode cannot lose clicks to the property rail underneath.
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