refactor(ui): finalize review fixes for action cards and view model

- Guard ActionCard click-outside listener behind open state
- Add aria-expanded to ActionGroup collapse toggle
- Use optional chaining and drop non-null assertions in column projection

src/state/viewModel.ts

@@ -147,7 +147,9 @@ export function toView(state: GameState, content: GameContent): GameView {
   }));
 
   const action = state.activeActionId ? content.actionsById[state.activeActionId] : undefined;
-  const actionProgress = action && action.durationMs ? Math.min(1, state.actionElapsedMs / action.durationMs) : 0;
+  const actionProgress = action?.durationMs
+    ? Math.min(1, state.actionElapsedMs / action.durationMs)
+    : 0;
   const queuedActionIds = [...state.actionQueue];
   const queuedActionNames = queuedActionIds.map((id) => content.actionsById[id]?.name ?? id);
 
@@ -180,9 +182,10 @@ export function toView(state: GameState, content: GameContent): GameView {
     const kindActions = content.actions.filter((a) => a.kind === kind);
 
     // For story kind: only include available actions (hides siblings after fork)
-    const includedActions = kind === 'story'
-      ? kindActions.filter((a) => actionViewMap.get(a.id)?.available === true)
-      : kindActions;
+    const includedActions =
+      kind === 'story'
+        ? kindActions.filter((a) => actionViewMap.get(a.id)?.available === true)
+        : kindActions;
 
     // Group by action.group, preserving first-seen order
     const groupOrder: string[] = [];
@@ -194,10 +197,12 @@ export function toView(state: GameState, content: GameContent): GameView {
         groupOrder.push(a.group.id);
         groupMap.set(a.group.id, { id: a.group.id, label: a.group.label, actions: [] });
       }
-      groupMap.get(a.group.id)!.actions.push(view);
+      groupMap.get(a.group.id)?.actions.push(view);
     }
 
-    const groups: ActionGroupView[] = groupOrder.map((gid) => groupMap.get(gid)!);
+    const groups: ActionGroupView[] = groupOrder
+      .map((gid) => groupMap.get(gid))
+      .filter((g): g is ActionGroupView => g !== undefined);
 
     return {
       kind,