Add ProfilePage and ProgressPage

ProfilePage:
- View/edit user info (name, age, height, goal, level)
- Show current measurements (weight, body fat, waist, neck)
- Show strength records (bench/squat/deadlift 1RM)

ProgressPage:
- Tab navigation (weight, body fat, strength)
- SVG line charts for progress visualization
- Stats showing current, first, and change
- Trend indicators (up/down)

Dashboard:
- Navigation icons for profile (👤) and progress (📊)
- Connected navigation to App.jsx routing

frontend/src/pages/Dashboard.jsx

@@ -30,7 +30,7 @@ const getCoachGreeting = (user, todayWorkout) => {
 // Get weekday names
 const weekdays = ['Mån', 'Tis', 'Ons', 'Tor', 'Fre', 'Lör', 'Sön']
 
-function Dashboard({ onStartWorkout }) {
+function Dashboard({ onStartWorkout, onNavigate }) {
   const { user, logout } = useAuth()
   const [program, setProgram] = useState(null)
   const [todayWorkout, setTodayWorkout] = useState(null)
@@ -81,8 +81,8 @@ function Dashboard({ onStartWorkout }) {
           <h1>🏋️ Gravl</h1>
           <nav className="nav-menu">
             <button className="nav-btn active">Hem</button>
-            <button className="nav-btn">Historik</button>
-            <button className="nav-btn">Profil</button>
+            <button className="nav-btn" onClick={() => onNavigate('progress')}>📊</button>
+            <button className="nav-btn" onClick={() => onNavigate('profile')}>👤</button>
             <button className="nav-btn logout" onClick={logout}>↪</button>
           </nav>
         </div>