feat: unified navigation hub + categories tab + mobile scroll fix

- Navigation: 4 items (Home, Tracker, Finance, Settings)
- Tracker page: tabs for Habits, Tasks, Stats
- Finance: added Categories tab (CRUD)
- AddTransactionModal: fixed mobile scroll with sticky button
- Home: added finance balance widget
- Legacy routes (/habits, /tasks, /stats) redirect to /tracker

src/pages/Habits.jsx

@@ -10,7 +10,7 @@ import EditHabitModal from '../components/EditHabitModal'
 import Navigation from '../components/Navigation'
 import clsx from 'clsx'
 
-export default function Habits() {
+export default function Habits({ embedded = false }) {
   const [showCreateModal, setShowCreateModal] = useState(false)
   const [editingHabit, setEditingHabit] = useState(null)
   const [showArchived, setShowArchived] = useState(false)
@@ -67,8 +67,8 @@ export default function Habits() {
   const archivedList = habits.filter(h => h.is_archived)
 
   return (
-    <div className="min-h-screen bg-surface-50 dark:bg-gray-950 gradient-mesh pb-24 transition-colors duration-300">
-      <header className="bg-white/70 dark:bg-gray-900/70 backdrop-blur-xl border-b border-gray-100/50 dark:border-gray-800 sticky top-0 z-10">
+    <div className={embedded ? "" : "min-h-screen bg-surface-50 dark:bg-gray-950 gradient-mesh pb-24 transition-colors duration-300"}>
+      {!embedded && <header className="bg-white/70 dark:bg-gray-900/70 backdrop-blur-xl border-b border-gray-100/50 dark:border-gray-800 sticky top-0 z-10">
         <div className="max-w-lg mx-auto px-4 py-4 flex items-center justify-between">
           <div>
             <h1 className="text-xl font-display font-bold text-gray-900 dark:text-white">Мои привычки</h1>
@@ -79,7 +79,7 @@ export default function Habits() {
             Новая
           </button>
         </div>
-      </header>
+      </header>}
 
       <main className="max-w-lg mx-auto px-4 py-6 space-y-6">
         {isLoading ? (
@@ -168,7 +168,7 @@ export default function Habits() {
         )}
       </main>
 
-      <Navigation />
+      {!embedded && <Navigation />}
       <CreateHabitModal open={showCreateModal} onClose={() => setShowCreateModal(false)} />
       <EditHabitModal open={!!editingHabit} onClose={() => setEditingHabit(null)} habit={editingHabit} />
     </div>