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/hooks/useKeyboardShortcuts.ts

@@ -1,9 +1,23 @@
 import { useEffect } from 'react';
-import { useGameStore } from '@/store';
+import { useGameStore, type ActivePage } from '@/store';
 import type { GameSpeed } from '@ai-tycoon/shared';
 
+const PAGE_SHORTCUTS: Record<string, ActivePage> = {
+  d: 'dashboard',
+  i: 'infrastructure',
+  r: 'research',
+  m: 'models',
+  k: 'market',
+  f: 'finance',
+  t: 'talent',
+  s: 'settings',
+};
+
 export function useKeyboardShortcuts() {
   useEffect(() => {
+    let gPressed = false;
+    let gTimer: ReturnType<typeof setTimeout>;
+
     const handler = (e: KeyboardEvent) => {
       if (e.ctrlKey && e.key === 'd') {
         e.preventDefault();
@@ -16,6 +30,17 @@ export function useKeyboardShortcuts() {
 
       const store = useGameStore.getState();
 
+      if (gPressed) {
+        gPressed = false;
+        clearTimeout(gTimer);
+        const page = PAGE_SHORTCUTS[e.key];
+        if (page) {
+          e.preventDefault();
+          store.setActivePage(page);
+        }
+        return;
+      }
+
       switch (e.key) {
         case ' ':
           e.preventDefault();
@@ -30,11 +55,16 @@ export function useKeyboardShortcuts() {
         case '3':
           store.setGameSpeed(5 as GameSpeed);
           break;
-        case 'Escape':
+        case 'g':
+          gPressed = true;
+          gTimer = setTimeout(() => { gPressed = false; }, 500);
           break;
       }
     };
     window.addEventListener('keydown', handler);
-    return () => window.removeEventListener('keydown', handler);
+    return () => {
+      window.removeEventListener('keydown', handler);
+      clearTimeout(gTimer);
+    };
   }, []);
 }