fix: auth icons

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

core/src/views/authentication/AuthLogin.vue

@@ -311,7 +311,16 @@ function backToIdentity() {
 }
 
 function getMethodIcon(method: AuthenticationMethod): string {
-  if (method.icon) return method.icon;
+  if (method.icon?.startsWith('mdi-') || method.icon?.startsWith('$')) {
+    return method.icon;
+  }
+
+  // Authentication providers may return a bare Material Design icon name
+  // (for example, "lock" or "mail") instead of Vuetify's "mdi-*" form.
+  if (method.icon && /^[a-z0-9-]+$/i.test(method.icon)) {
+    return `mdi-${method.icon}`;
+  }
+
   switch (method.method) {
     case 'credential': return 'mdi-key';
     case 'challenge': return 'mdi-shield-check';
@@ -388,7 +397,7 @@ function getMethodIcon(method: AuthenticationMethod): string {
             size="large"
             @click="initiateSsoLogin(method.id)"
           >
-            <v-icon v-if="method.icon" start>{{ method.icon }}</v-icon>
+            <v-icon start>{{ getMethodIcon(method) }}</v-icon>
             {{ method.label }}
           </v-btn>
         </div>