UI Phase 2 (L8): unify Profile section headers with AppSectionHeader

The Profile screen's card section titles used plain bold titleMedium text,
inconsistent with the cyber accent-bar section headers elsewhere. Convert
"Profile Photo", "Face Verification", "Account details", "Password" and
"Offices" to AppSectionHeader so they read the same as the rest of the app.

Verified: flutter analyze lib clean; flutter build web green; visual QA
(Profile) in dark.

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/screens/profile/profile_screen.dart

@@ -14,6 +14,7 @@ import '../../widgets/face_verification_overlay.dart';
 import '../../widgets/multi_select_picker.dart';
 import '../../widgets/qr_verification_dialog.dart';
 import '../../widgets/app_page_header.dart';
+import '../../widgets/app_section_header.dart';
 import '../../widgets/responsive_body.dart';
 import '../../utils/snackbar.dart';
 
@@ -102,10 +103,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
                   child: Column(
                     crossAxisAlignment: CrossAxisAlignment.start,
                     children: [
-                      Text(
-                        'Account details',
-                        style: Theme.of(context).textTheme.titleMedium,
-                      ),
+                      const AppSectionHeader('Account details', padding: EdgeInsets.zero),
                       const SizedBox(height: 12),
                       // Email (read-only)
                       TextFormField(
@@ -151,10 +149,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
                   child: Column(
                     crossAxisAlignment: CrossAxisAlignment.start,
                     children: [
-                      Text(
-                        'Password',
-                        style: Theme.of(context).textTheme.titleMedium,
-                      ),
+                      const AppSectionHeader('Password', padding: EdgeInsets.zero),
                       const SizedBox(height: 8),
                       const Text(
                         'Set or change your password. OAuth users (Google/Meta) can set a password here.',
@@ -224,10 +219,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
-                    Text(
-                      'Offices',
-                      style: Theme.of(context).textTheme.titleMedium,
-                    ),
+                    const AppSectionHeader('Offices', padding: EdgeInsets.zero),
                     const SizedBox(height: 12),
                     officesAsync.when(
                       data: (offices) {
@@ -286,7 +278,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text('Profile Photo', style: theme.textTheme.titleMedium),
+            const AppSectionHeader('Profile Photo', padding: EdgeInsets.zero),
             const SizedBox(height: 16),
             Center(
               child: Stack(
@@ -359,7 +351,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text('Face Verification', style: theme.textTheme.titleMedium),
+            const AppSectionHeader('Face Verification', padding: EdgeInsets.zero),
             const SizedBox(height: 8),
             Text(
               'Enroll your face for attendance verification. '