chore: 移除未使用的 loadConnectionModeTimestamp 函数

desktop/src/lib/saas-session.ts

@@ -181,17 +181,3 @@ export function loadConnectionMode(): string | null {
   }
 }
 
-/**
- * Load the timestamp of the persisted connection mode.
- * Returns null if not set or format is legacy.
- */
-export function loadConnectionModeTimestamp(): number | null {
-  const raw = localStorage.getItem(SAASMODE_KEY);
-  if (!raw) return null;
-  try {
-    const parsed = JSON.parse(raw);
-    return parsed.timestamp ?? null;
-  } catch {
-    return null;
-  }
-}