feat(help): Add floating help button to all pages

Replaced inline HelpButton components with a global FloatingHelpButton
that appears fixed in the top-right corner of all pages. The button:
- Automatically detects the current route and links to the appropriate help page
- Uses a consistent position across all pages (fixed, top-right)
- Is hidden on help pages themselves
- Works on both business and platform layouts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/src/layouts/PlatformLayout.tsx

@@ -6,6 +6,7 @@ import PlatformSidebar from '../components/PlatformSidebar';
 import UserProfileDropdown from '../components/UserProfileDropdown';
 import NotificationDropdown from '../components/NotificationDropdown';
 import TicketModal from '../components/TicketModal';
+import FloatingHelpButton from '../components/FloatingHelpButton';
 import { useTicket } from '../hooks/useTickets';
 import { useScrollToTop } from '../hooks/useScrollToTop';
 
@@ -36,6 +37,9 @@ const PlatformLayout: React.FC<PlatformLayoutProps> = ({ user, darkMode, toggleT
 
   return (
     <div className="flex h-screen bg-gray-100 dark:bg-gray-900">
+      {/* Floating Help Button */}
+      <FloatingHelpButton />
+
       {/* Mobile menu */}
       <div className={`fixed inset-y-0 left-0 z-40 transform ${isMobileMenuOpen ? 'translate-x-0' : '-translate-x-full'} transition-transform duration-300 ease-in-out md:hidden`}>
         <PlatformSidebar user={user} isCollapsed={false} toggleCollapse={() => { }} />