fix: resolve username mismatch in login by fetching profile for canonical name

- Add notifyAuthChange() call after successful token validation in setAuthFromToken
- Fetch user profile during login to obtain canonical username instead of using raw input
- Update both authData and currentUser objects with resolved username from profile API
- Handle profile fetch failure gracefully by falling back to provided username

js/services/auth.js

@@ -21,6 +21,7 @@ class AuthService {
                 id: authData.userId,
                 username: authData.username
             };
+            this.notifyAuthChange();
             return true;
         }
         return false;
@@ -29,11 +30,18 @@ class AuthService {
     async login(username, password, remember = true) {
         const result = await this.api.login(username, password);
         if (result.success) {
+            let actualUsername = username;
+            try {
+                const profileResult = await this.api.getProfile(result.authToken.user_id);
+                if (profileResult?.success && profileResult.profile?.username) {
+                    actualUsername = profileResult.profile.username;
+                }
+            } catch (e) {}
             const authData = {
                 tokenId: result.authToken.id,
                 tokenKey: result.authToken.key,
                 userId: result.authToken.user_id,
-                username: username,
+                username: actualUsername,
                 expireTime: result.authToken.expire_time
             };
             if (remember) {
@@ -41,7 +49,7 @@ class AuthService {
             }
             this.currentUser = {
                 id: authData.userId,
-                username: username
+                username: actualUsername
             };
             this.notifyAuthChange();
             return { success: true, user: this.currentUser };