implement MultitabPane widget + controller (T-83)

MultitabController<T> is a Flutter-free ChangeNotifier owning the
tab list, active selection, and reorder/close invariants:
- pinned (non-reorderable) entries form barriers that other tabs
  cannot cross
- non-closeable entries silently no-op on remove() so hosts don't
  need to gate the call site
- closing the active tab falls right, then left, then to null
- duplicate ids are rejected

MultitabPane<T> is the widget shell: a horizontal tab strip
followed by the active entry's body. Active tab gets the
panelHeader background and a panelActiveBorder top accent;
inactive tabs blend into the tab bar. Close × is hidden until
hover. Add button only renders when onAddRequested is wired.

Hosts route the user's add/close intent through callbacks so the
widget stays domain-free — for the Claude pane, add will spawn a
new tmux session and close will kill one. Drag-to-reorder is
controller-side only for now (the gesture wiring lands with T-24).

19 controller tests + 9 widget tests.

Co-Authored-By: Claude <noreply@anthropic.com>

.pql/pql-plan.json

@@ -1,5 +1,5 @@
 {
-  "exported_at": "2026-05-06T10:04:42Z",
+  "exported_at": "2026-05-06T10:12:42Z",
   "decisions": [
     {
       "id": "D-1",