feat(ui): D.5.3/B.2 — toolbar reorder/remove via ShortcutStore + wire + green-cross overlay

ToolbarController is now the LIVE drag handler:
- OnDragLift: removes the source slot from ShortcutStore, sends
  RemoveShortcut (0x019D) wire immediately (retail remove-on-lift model).
- HandleDropRelease: evicts occupant from target (RemoveShortcut),
  places dragged item (AddShortcut 0x019C), bumps evicted item into
  the vacated source slot if empty (swap path); off-bar release leaves
  the lift's removal standing.
- Populate() now lazy-loads ShortcutStore from the PD shortcut list on
  first call; store is authoritative thereafter.
- IsShortcutGuid() uses the store (O(18)) when loaded, falls back to
  scanning _shortcuts() in the pre-PD window.
- All 18 slot cells now get DragAcceptSprite=0x060011FA (green cross,
  distinct from the inventory ring 0x060011F9).
- GameWindow.Bind wired: sendAddShortcut + sendRemoveShortcut lambdas
  forwarded to _liveSession?.Send*().
- Divergence register: AP-47 Divergence+Risk cells updated (opacity
  corrected, underlay-backing framing improved). TS-33 row deleted
  (stopgap retired). Section header 32→31 rows.
- Tests: HandleDropRelease_isInertStub removed; 5 new B.2 tests added
  (lift removes + sends, swap sequence, empty-target place, self-drop
  re-adds, green-cross sprite). 24/24 ToolbarController tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -2018,7 +2018,9 @@ public sealed class GameWindow : IDisposable
                     combatState: Combat,
                     peaceDigits:  toolbarPeaceDigits,
                     warDigits:    toolbarWarDigits,
-                    emptyDigits:  toolbarEmptyDigits);
+                    emptyDigits:  toolbarEmptyDigits,
+                    sendAddShortcut:    (i, g) => _liveSession?.SendAddShortcut(i, g),
+                    sendRemoveShortcut: i => _liveSession?.SendRemoveShortcut(i));
 
                 // Phase D.5.3a — selected-object strip (name, overlay state, health meter).
                 // Analogue of retail gmToolbarUI::HandleSelectionChanged