fix: fixes to session storage

frontend/src/pages/Login.vue

@@ -88,73 +88,33 @@ const startProviderLogin = (providerId) => {
     window.location.href = `${apiClient.defaults.baseURL}/api/v1/auth/providers/${providerId}/start`;
 };
 
-const decodeBase64Url = (value) => {
-    const normalized = value.replace(/-/g, "+").replace(/_/g, "/");
-    const padding = normalized.length % 4;
-    const padded = padding === 0 ? normalized : `${normalized}${"=".repeat(4 - padding)}`;
-    return atob(padded);
-};
-
-const decodeBase64UrlUTF8 = (value) => {
-    const binary = decodeBase64Url(value);
-    const bytes = Uint8Array.from(binary, (ch) => ch.charCodeAt(0));
-    return new TextDecoder().decode(bytes);
-};
-
-const readUserFromQuery = (params) => {
-    const plainUserJSON = params.get("user_json");
-    if (plainUserJSON) {
-        return JSON.parse(plainUserJSON);
-    }
-
-    const encodedUser = params.get("user");
-    if (encodedUser) {
-        return JSON.parse(decodeBase64UrlUTF8(encodedUser));
-    }
-
-    return null;
-};
-
 const completeOAuthRedirect = async () => {
     const params = new URLSearchParams(window.location.search);
     const status = params.get("status");
-    const accessToken = params.get("access_token") || params.get("accessToken") || params.get("token");
 
     if (status === "oauth_error") {
         error.value = params.get("message") || "Provider sign-in failed.";
         return true;
     }
 
-    // Accept callback payloads even when `status` is missing.
-    if (status !== "oauth_success" && !accessToken) {
-        if (status === "oauth_error") {
-            error.value = params.get("message") || "Provider sign-in failed.";
-        }
+    if (status !== "oauth_success") {
         return false;
     }
 
-    if (!accessToken) {
-        error.value = "Provider sign-in returned an incomplete session.";
+    try {
+        await authStore.ensureInitialized();
+    } catch {
+        error.value = "Unable to restore provider session.";
         return true;
     }
 
-    try {
-        const user = readUserFromQuery(params);
-        if (!user) {
-            error.value = "Provider sign-in returned an incomplete session.";
-            return true;
-        }
-
-        authStore.setSession({ access_token: accessToken, user });
-        await router.replace("/");
-    } catch {
-        error.value = "Unable to restore the provider session.";
-    }
-
     if (authStore.isAuthenticated) {
-        window.location.replace("/");
+        await router.replace("/");
+        return true;
     }
 
+    error.value = "Provider sign-in returned an incomplete session.";
+
     return true;
 };
 
@@ -163,6 +123,8 @@ onMounted(async () => {
     registrationEnabled.value = !!flags.registration_enabled;
     providerLoginEnabled.value = !!flags.provider_login_enabled;
 
+    await authStore.ensureInitialized();
+
     if (authStore.isAuthenticated) {
         await router.replace("/");
         return;