Comprehensive UX audit fixes: navigation, feedback, affordances, and accessibility

Address 18 issues across high/medium/low impact tiers identified in a full
interface review. Key changes: Models page decomposed into tabs, confirmation
dialogs for irreversible actions (deploy/open-source/acquire), chart Y-axes
made visible, hash router extended for Market tab persistence, collapsible
sidebar, keyboard navigation shortcuts (g+key chords), notification bulk
actions, achievement progress bars, and ARIA label improvements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/store/index.ts

@@ -88,6 +88,8 @@ interface Actions {
   setInfraNav: (nav: InfraNav) => void;
   addNotification: (n: Omit<GameNotification, 'id' | 'read'>) => void;
   dismissNotification: (id: string) => void;
+  removeNotification: (id: string) => void;
+  clearAllNotifications: () => void;
   markAllNotificationsRead: () => void;
   startNewGame: (companyName: string) => void;
   setGameSpeed: (speed: GameSpeed) => void;
@@ -305,6 +307,12 @@ export const useGameStore = create<Store>()(
         ),
       })),
 
+      removeNotification: (id) => set((s) => ({
+        notifications: s.notifications.filter(n => n.id !== id),
+      })),
+
+      clearAllNotifications: () => set({ notifications: [] }),
+
       markAllNotificationsRead: () => set((s) => ({
         notifications: s.notifications.map(n => ({ ...n, read: true })),
       })),