fix: Analyst ratings abort without reason on overview page

- trpcQuery/trpcMutate now throw 'Request timed out (8s)' instead of
  generic 'The operation was aborted.' so users know WHY the request failed
- AnalystRatings adds cancelled guard (race condition fix) so stale
  promise results from symbol changes are ignored (matches OverviewPanel
  pattern)
- Add Retry button on error state for timeout or other failures
- useEffect cleanup returns cancelled flag setter

app/src/lib/trpc.ts

@@ -396,6 +396,11 @@ async function trpcQuery<T>(procedure: string, input?: unknown): Promise<T> {
       signal: controller.signal,
     });
     return parse<T>(res);
+  } catch (e) {
+    if (e instanceof DOMException && e.name === "AbortError") {
+      throw new Error(`Request timed out (${TRPC_TIMEOUT_MS / 1000}s)`);
+    }
+    throw e;
   } finally {
     clearTimeout(timer);
   }
@@ -413,6 +418,11 @@ async function trpcMutate<T>(procedure: string, input: unknown): Promise<T> {
       signal: controller.signal,
     });
     return parse<T>(res);
+  } catch (e) {
+    if (e instanceof DOMException && e.name === "AbortError") {
+      throw new Error(`Request timed out (${TRPC_TIMEOUT_MS / 1000}s)`);
+    }
+    throw e;
   } finally {
     clearTimeout(timer);
   }