Add profile management features

- Introduced profile update and password change functionalities in main.py.
- Added new ProfileUpdate and PasswordChange schemas in user.py.
- Updated base.html to include a profile link in the navigation and modified user chip for better accessibility.
- Enhanced CSS for user chip links to improve UI interaction.

app/static/css/main.css

@@ -115,6 +115,15 @@ a:hover { color: var(--tk-orange-dark); text-decoration: underline; }
     color: #CCCCCC;
 }
 
+a.user-chip-link {
+    text-decoration: none;
+    cursor: pointer;
+}
+
+a.user-chip-link:hover {
+    color: #FFFFFF;
+}
+
 .topbar .btn-logout {
     background: transparent;
     border: 1px solid rgba(255, 255, 255, 0.35);