fix(query): deduplicate timeout setting actions

apps/desktop/src/lib/__tests__/sql/queryError.spec.ts

@@ -64,6 +64,18 @@ describe("isQueryTimeoutErrorMessage", () => {
     expect(isQueryTimeoutErrorMessage("Agent RPC error (-1): Agent RPC call timed out (120s)")).toBe(true);
   });
 
+  it("classifies only execute and fetch Agent RPC stages as query timeouts", () => {
+    for (const stage of ["execute", "fetch"]) {
+      expect(isQueryTimeoutErrorMessage(`Agent RPC call timed out at ${stage}`)).toBe(true);
+    }
+
+    for (const stage of ["request", "checkout", "connect", "validate", "cancel", "close"]) {
+      expect(isQueryTimeoutErrorMessage(`Agent RPC call timed out at ${stage}`)).toBe(false);
+    }
+
+    expect(isConnectionTimeoutErrorMessage("Agent RPC call timed out at connect")).toBe(true);
+  });
+
   it("detects structured query operation timeouts before localized text matching", () => {
     const timeoutError = {
       version: 1,

apps/desktop/src/lib/sql/queryError.ts

@@ -26,8 +26,13 @@ export function isQueryTimeoutErrorMessage(message: string, backendError?: Backe
   // Agent RPC client-side timeout (tokio::time::timeout in agent_driver.rs). This is the
   // fallback when JDBC setQueryTimeout never fires (unsupported/unresponsive driver), so the
   // backend already treats it as a query timeout (is_agent_rpc_timeout_error in query.rs) —
-  // surface the same action here to stay consistent with the backend.
-  if (/\bagent rpc call timed out\b/.test(lower)) return true;
+  // surface the same action here to stay consistent with the backend. Connection and other
+  // infrastructure stages must be excluded first because their messages can share this prefix.
+  const agentTimeout = /\bagent rpc call timed out(?: at ([a-z_]+))?\b/.exec(lower);
+  if (agentTimeout) {
+    const stage = agentTimeout[1];
+    return stage === undefined || QUERY_TIMEOUT_STAGES.has(stage);
+  }
   if (/\b(?:canceling|cancelling|canceled|cancelled)\b[\s\S]{0,80}\bstatement\b[\s\S]{0,80}\btimeout\b/.test(lower)) return true;
   if (/\b(?:connection|connect|pool|checkout|metadata|loading|health check|cancel request|ssh|tunnel)\b/.test(lower)) return false;
   return (