Add profile page for changing password and email

New /profile route (nav link between Admin and Logout) with two
independent forms, both requiring the current password before
applying a change:
- Change password: standard current/new/repeat flow, same password
  strength rules as registration.
- Change email: re-checks the new address isn't already taken (avoids
  a 500 from the unique constraint), then marks the account
  unverified and re-sends the confirmation email via the existing
  EmailVerifier/verify-email flow, same as registration. The current
  session stays logged in, but the user needs to verify the new
  address before their next login (UserChecker already blocks
  unverified accounts).

templates/layout/site.html.twig

@@ -26,6 +26,9 @@
                                 <a class="nav-link" href="{{ path('game_admin_dashboard') }}">{{ 'nav.admin'|trans }}</a>
                             </li>
                         {% endif %}
+                        <li class="nav-item">
+                            <a class="nav-link" href="{{ path('app_profile') }}">{{ 'nav.profile'|trans }}</a>
+                        </li>
                         <li class="nav-item">
                             <a class="nav-link" href="{{ path('app_logout') }}">{{ 'nav.logout'|trans }}</a>
                         </li>

templates/tech/profile/index.html.twig

@@ -0,0 +1,39 @@
+{% extends 'layout/site.html.twig' %}
+
+{% block title %}Profile{% endblock %}
+
+{% block body %}
+    <h1 class="mb-4">Profile</h1>
+
+    <div class="row g-4">
+        <div class="col-md-6">
+            <div class="card h-100">
+                <div class="card-header bg-secondary text-white">Change Email</div>
+                <div class="card-body">
+                    <p class="text-muted">Current email: {{ user.email }}</p>
+                    {{ form_start(emailForm) }}
+                        {{ form_row(emailForm.email) }}
+                        {{ form_row(emailForm.currentPassword) }}
+                        <div class="d-grid mt-3">
+                            <button type="submit" class="btn btn-primary">Update Email</button>
+                        </div>
+                    {{ form_end(emailForm) }}
+                </div>
+            </div>
+        </div>
+        <div class="col-md-6">
+            <div class="card h-100">
+                <div class="card-header bg-secondary text-white">Change Password</div>
+                <div class="card-body">
+                    {{ form_start(passwordForm) }}
+                        {{ form_row(passwordForm.currentPassword) }}
+                        {{ form_row(passwordForm.plainPassword) }}
+                        <div class="d-grid mt-3">
+                            <button type="submit" class="btn btn-primary">Update Password</button>
+                        </div>
+                    {{ form_end(passwordForm) }}
+                </div>
+            </div>
+        </div>
+    </div>
+{% endblock %}