🗂️ Add Collapsible Community Navigation Section

✨ Hierarchical Navigation Structure:
- Created collapsible Community section with expandable sub-items
- Sub-items: Collections, Decks, Forums (ready for future implementation)
- Smooth expand/collapse animation with chevron icon rotation
- Auto-expands when navigating to any community page

🎨 Visual Design:
- Main Community item with chevron indicator (rotates 90° when expanded)
- Sub-items indented with left border for visual hierarchy
- Smaller sub-item styling (text-sm, rounded-xl, lighter shadows)
- Consistent hover and active states throughout

🔧 Technical Features:
- State management for expand/collapse (isCommunityExpanded)
- useEffect to auto-expand on community page navigation
- Proper ARIA attributes (aria-expanded, aria-haspopup)
- Keyboard navigation support (Enter/Space to toggle)
- Mobile menu integration (closes on sub-item click)

🎯 User Experience:
- Intuitive collapsible navigation matching the design mockup
- Clear visual hierarchy between main and sub-navigation
- Smooth transitions and proper focus management
- Accessibility-compliant with screen reader support

Navigation now matches the requested collapsible structure! 📁

components/Layout.js

@@ -1,4 +1,4 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { useRouter } from 'next/router';
 import Link from 'next/link';
 import { useTheme } from '../lib/theme-context';
@@ -127,6 +127,16 @@ export default function Layout({ children, user = { email: 'me@randallstillwell.
   const { theme, toggleTheme } = useTheme();
   const [searchQuery, setSearchQuery] = useState('');
   const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
+  const [isCommunityExpanded, setIsCommunityExpanded] = useState(
+    router.pathname.startsWith('/community')
+  );
+
+  // Auto-expand Community section when navigating to community pages
+  useEffect(() => {
+    if (router.pathname.startsWith('/community')) {
+      setIsCommunityExpanded(true);
+    }
+  }, [router.pathname]);
 
   const navigation = [
     { name: 'Dashboard', href: '/dashboard', icon: 'grid', active: router.pathname === '/dashboard' },
@@ -134,14 +144,24 @@ export default function Layout({ children, user = { email: 'me@randallstillwell.
     { name: 'Cards', href: '/cards', icon: 'card', active: router.pathname === '/cards' },
     { name: 'Decks', href: '/decks', icon: 'deck', active: router.pathname === '/decks', badge: '12' },
     { name: 'Analytics', href: '/analytics', icon: 'analytics', active: router.pathname === '/analytics' },
-    { name: 'Community', href: '/community', icon: 'community', active: router.pathname === '/community' },
-    { name: 'Community Collections', href: '/community/collections', icon: 'community', active: router.pathname === '/community/collections' },
     { name: 'Settings', href: '/settings', icon: 'settings', active: router.pathname === '/settings' },
     ...(user?.role === 'admin' ? [
       { name: 'Admin Tools', href: '/admin/card-editor', icon: 'admin', active: router.pathname.startsWith('/admin'), badge: 'ADMIN' }
     ] : [])
   ];
 
+  const communityNavigation = {
+    name: 'Community',
+    icon: 'community',
+    active: router.pathname.startsWith('/community'),
+    expanded: isCommunityExpanded,
+    items: [
+      { name: 'Collections', href: '/community/collections', active: router.pathname === '/community/collections' },
+      { name: 'Decks', href: '/community/decks', active: router.pathname === '/community/decks' },
+      { name: 'Forums', href: '/community/forums', active: router.pathname === '/community/forums' }
+    ]
+  };
+
   const bottomNavigation = [
     { name: 'Notifications', href: '/notifications', icon: 'notifications', active: router.pathname === '/notifications' },
     { name: 'Settings', href: '/settings', icon: 'settings', active: router.pathname === '/settings' },
@@ -321,6 +341,91 @@ export default function Layout({ children, user = { email: 'me@randallstillwell.
                 </div>
               </Link>
             ))}
+
+            {/* Community Section with Sub-items */}
+            <div className="space-y-1">
+              <div 
+                className={`
+                  nav-item flex items-center justify-between px-4 py-3 rounded-2xl 
+                  transition-all duration-200 cursor-pointer
+                  focus-within:outline-none focus-within:ring-2 focus-within:ring-offset-2
+                  ${communityNavigation.active 
+                    ? 'shadow-lg nav-item-active' 
+                    : 'hover:shadow-md nav-item-hover'
+                  }
+                `}
+                style={{
+                  backgroundColor: communityNavigation.active ? 'var(--bg-tertiary)' : 'transparent',
+                  color: communityNavigation.active ? 'var(--text-primary)' : 'var(--text-secondary)',
+                  '--tw-ring-color': 'var(--accent-ember)',
+                  '--tw-ring-offset-color': 'var(--bg-secondary)'
+                }}
+                onClick={() => setIsCommunityExpanded(!isCommunityExpanded)}
+                role="menuitem"
+                aria-expanded={isCommunityExpanded}
+                aria-haspopup="menu"
+                tabIndex={0}
+                onKeyDown={(e) => {
+                  if (e.key === 'Enter' || e.key === ' ') {
+                    e.preventDefault();
+                    setIsCommunityExpanded(!isCommunityExpanded);
+                  }
+                }}
+              >
+                <div className="flex items-center">
+                  <span className="mr-3" aria-hidden="true">{getIcon(communityNavigation.icon)}</span>
+                  <span className="font-medium">{communityNavigation.name}</span>
+                </div>
+                <svg 
+                  className={`w-4 h-4 transition-transform duration-200 ${isCommunityExpanded ? 'rotate-90' : ''}`}
+                  fill="none" 
+                  stroke="currentColor" 
+                  viewBox="0 0 24 24"
+                  aria-hidden="true"
+                >
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
+                </svg>
+              </div>
+
+              {/* Community Sub-items */}
+              {isCommunityExpanded && (
+                <div className="ml-4 space-y-1 border-l-2 pl-4" style={{ borderColor: 'var(--border)' }}>
+                  {communityNavigation.items.map((subItem) => (
+                    <Link key={subItem.name} href={subItem.href}>
+                      <div 
+                        className={`
+                          nav-item flex items-center px-4 py-2 rounded-xl 
+                          transition-all duration-200 cursor-pointer text-sm
+                          focus-within:outline-none focus-within:ring-2 focus-within:ring-offset-2
+                          ${subItem.active 
+                            ? 'shadow-md nav-item-active' 
+                            : 'hover:shadow-sm nav-item-hover'
+                          }
+                        `}
+                        style={{
+                          backgroundColor: subItem.active ? 'var(--bg-tertiary)' : 'transparent',
+                          color: subItem.active ? 'var(--text-primary)' : 'var(--text-secondary)',
+                          '--tw-ring-color': 'var(--accent-ember)',
+                          '--tw-ring-offset-color': 'var(--bg-secondary)'
+                        }}
+                        onClick={() => setIsMobileMenuOpen(false)}
+                        role="menuitem"
+                        aria-current={subItem.active ? 'page' : undefined}
+                        tabIndex={0}
+                        onKeyDown={(e) => {
+                          if (e.key === 'Enter' || e.key === ' ') {
+                            e.preventDefault();
+                            setIsMobileMenuOpen(false);
+                          }
+                        }}
+                      >
+                        <span className="font-medium">{subItem.name}</span>
+                      </div>
+                    </Link>
+                  ))}
+                </div>
+              )}
+            </div>
           </nav>
 
           {/* Bottom Section */}