handle rate limits gracefully, and add ability to check google server for every request in case they reset rate limits on their end, thereby not relying on local cache alone

src/server.js

@@ -55,8 +55,8 @@ function parseError(error) {
         statusCode = 401;
         errorMessage = 'Authentication failed. Make sure Antigravity is running with a valid token.';
     } else if (error.message.includes('429') || error.message.includes('RESOURCE_EXHAUSTED') || error.message.includes('QUOTA_EXHAUSTED')) {
-        errorType = 'overloaded_error';  // Claude Code recognizes this type
-        statusCode = 529;  // Use 529 for overloaded (Claude API convention)
+        errorType = 'invalid_request_error';  // Use invalid_request_error to force client to purge/stop
+        statusCode = 400;  // Use 400 to ensure client does not retry (429 and 529 trigger retries)
 
         // Try to extract the quota reset time from the error
         const resetMatch = error.message.match(/quota will reset after (\d+h\d+m\d+s|\d+m\d+s|\d+s)/i);
@@ -191,6 +191,9 @@ app.post('/v1/messages', async (req, res) => {
         // Ensure account manager is initialized
         await ensureInitialized();
 
+        // Optimistic Retry: Reset all local rate limits to force a fresh check on Google's side
+        accountManager.resetAllRateLimits();
+
         const {
             model,
             messages,