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/App.jsx

@@ -1,6 +1,8 @@
 import { useState, useEffect } from 'react'
 import { useAuth } from './context/AuthContext'
 import Dashboard from './pages/Dashboard'
+import ProfilePage from './pages/ProfilePage'
+import ProgressPage from './pages/ProgressPage'
 import './App.css'
 
 const API_URL = '/api'
@@ -95,7 +97,22 @@ function App() {
 
   // Dashboard view (default after login)
   if (view === 'dashboard') {
-    return <Dashboard onStartWorkout={startWorkout} />
+    return (
+      <Dashboard 
+        onStartWorkout={startWorkout}
+        onNavigate={setView}
+      />
+    )
+  }
+
+  // Profile page
+  if (view === 'profile') {
+    return <ProfilePage onBack={() => setView('dashboard')} />
+  }
+
+  // Progress page
+  if (view === 'progress') {
+    return <ProgressPage onBack={() => setView('dashboard')} />
   }
 
   // Workout view