* feat(app): let the file panel close its tree rail
The file panel's tree rail was permanent on desktop — the changes panel
had a folder-tree toggle in its toolbar, the file toolbar had nothing, so
the rail was there whether you wanted it or not.
The changes panel's private DesktopTreeToggle becomes a shared
TreeRailToggle so both toolbars render the same affordance; that also
drops the treeToggleStyle prop threaded through ChangesToolbarProps,
which recomputed exactly what the component already built internally.
The i18n keys move out of workspace.git.diff into workspace.tree, since a
shared component reaching into the git namespace would rot.
The two rails keep independent flags — the file rail in panel-store, the
changes rail in useChangesPreferences — so closing one leaves the other
alone. FileTreeToggle wires itself to the store rather than taking a
callback: the bar renders several components below FilePanel, where the
rail actually lives.
Both rails also get narrower (320 -> 260 default, 200 -> 180 minimum).
The persist version bump resets treeRailWidth on purpose: nearly every
existing install carries the old 320 default, so without the reset the
narrower rail would only ever reach new users. Anyone who dragged their
rail to a deliberate custom width loses it once.
Note that MIN_CONTENT_WIDTH still clamps the rail to
`containerWidth - 240`, so in a narrow pane the new default never
applies — that floor, not the default, is what sets the width there.
* feat(app): make the side panel an empty workspace surface
The fixed, hideable side panel keeps supporting context beside an agent without seeding content. Pane-local choices stay local, while implicit supporting opens follow a persisted routing preference.
* test(app): exercise side panel policy through its capability boundary
The browser rail journey already covers the real tree-toggle behavior. Side-panel policy tests now pass their platform capability through the public boundary instead of replacing a production module.
* test(app): expect an empty side panel after upgrade
* test(app): expect an empty first split pane
* test(app): account for the empty side panel in split retention
* feat(app): make workspace panel tabs independent
Give explicit New actions fresh tab instances, keep panel state opaque to tab management, preserve File navigation context, and stabilize uncached File transitions.
* fix(app): preserve file conflicts during preview refresh
Keep the current preview mounted for same-target reads and conversions so the editor retains its conflict observation state. Clear retained previews only when the file target changes.
Reuse measured diff geometry when review controls open, keeping the interaction responsive on large changes. Preserve complete tab-track snapshots while exact content widths settle so new tabs and retained workspaces do not flash or truncate.
Keep diff headers and painted content on the same scroll clock while preserving native scrolling and independent per-file horizontal offsets.
Complete review, selection, typography, tree, and palette parity without returning line rendering to React.
* perf(app): bound large diff row mounting
Keep the existing vertical and horizontal scroll owners so virtualization does not change gesture or scrolling behavior. Reserve exact offscreen row heights while mounting only the visible window, and retain the full renderer when wrapping or editing reviews requires dynamic geometry.
* perf(app): keep large diff reviews responsive
Opening an inline editor changed the whole review action object, reconciled large syntax-token trees, and disabled row virtualization. Keep the expensive token subtree stable and preserve deterministic row geometry while the editor is open.\n\nBound server-side highlighting for pathological single lines and remove the unused client highlighter so the actual diff pipeline owns the limit.
* test(app): check mounted diff typography
Row virtualization can unmount a fixed diff row after scrolling. Assert the configured font size against a currently mounted row so the test continues to verify rendered typography without depending on window position.
* test(app): stabilize Mermaid streaming coverage
