fix: pre-create user_preferences row in getUserPrefs to prevent loop

createRow inside a Server Action triggers Next.js router cache
invalidation → layout reruns → components remount → loop.
By creating the empty row from getUserPrefs (Server Component,
not Server Action), saveUserPrefsAction always hits updateRow
which doesn't cause cache invalidation.

src/lib/appwrite/user-prefs-actions.ts

@@ -27,7 +27,26 @@ export async function getUserPrefs(): Promise<UserPrefs> {
       queries: [Query.equal("userId", user.$id), Query.limit(1)],
     });
 
-    if (result.rows.length === 0) return {};
+    if (result.rows.length === 0) {
+      // Pre-create an empty row so saveUserPrefsAction always calls updateRow
+      // (createRow inside a Server Action causes router cache invalidation → remount loop)
+      try {
+        await tablesDB.createRow(
+          DATABASE_ID,
+          TABLES.userPreferences,
+          ID.unique(),
+          { userId: user.$id },
+          [
+            Permission.read(Role.user(user.$id)),
+            Permission.update(Role.user(user.$id)),
+            Permission.delete(Role.user(user.$id)),
+          ],
+        );
+      } catch {
+        // race condition or already exists — fine
+      }
+      return {};
+    }
 
     const row = result.rows[0] as Record<string, unknown>;
     const str = (v: unknown) => (v && typeof v === "string" ? v : undefined);