feat(lanes,ui): per-lane git surface — Changes panel, VS Code-style diff, branch-aware Add lane, redesigned tooltips (#34, #35)

- Changes card beside lane detail with five modes: Files tree, overview,
  Review (whole diff, per-file collapse), single file, commit history.
- LaneDiffView: unified / side-by-side with independent scroll on both axes
  and mirrored scrollLeft, expand/collapse context, intra-line emphasis.
- Staged-only commit box; git actions (fetch/pull/push/stage/unstage/
  discard/commit/switch/branch-create/branch-delete) guarded in git-ops.js.
- Server: git-diff.js + git-ops.js behind GET /api/lanes/:id/git/* and
  POST /api/lanes/:id/git/:action; gitFacts gains upstream/ahead/behind.
- Add lane: new/existing branch, current branch, worktree list, prefill
  from the git bar's "New lane here"; /api/run/cwds gains a repo kind.
- GlobalTooltip upgrades every native title into a themed anchored bubble;
  chart/info popovers use theme tokens.

client/src/components/run/RunSetup.tsx

@@ -36,6 +36,7 @@ import {
   ShieldAlert,
   X,
   FolderOpen,
+  GitBranch,
   Home,
   History as HistoryIcon,
   Search,
@@ -449,7 +450,10 @@ export function CwdAutocomplete({
   // Group suggestions by kind preserving fixed order — home first, matching
   // the neutral default the page pre-fills (issue #202).
   const groups = useMemo(() => {
-    const order: CwdSuggestion["kind"][] = ["home", "dashboard", "recent"];
+    // "repo" (source repos lanes were cut from) sits above the recents: on the
+    // Add-lane form it is the group the field is actually asking for, and on
+    // the Run form it is a short, deliberate list rather than history.
+    const order: CwdSuggestion["kind"][] = ["home", "dashboard", "repo", "recent"];
     return order
       .map((kind) => ({ kind, items: filtered.filter((s) => s.kind === kind) }))
       .filter((g) => g.items.length > 0);
@@ -525,6 +529,8 @@ export function CwdAutocomplete({
                     <FolderOpen className="w-3 h-3" />
                   ) : g.kind === "home" ? (
                     <Home className="w-3 h-3" />
+                  ) : g.kind === "repo" ? (
+                    <GitBranch className="w-3 h-3" />
                   ) : (
                     <HistoryIcon className="w-3 h-3" />
                   )}