fix: prevent duplicate update submissions

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tallynote",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "private": true,
   "type": "module",
   "packageManager": "pnpm@9.0.6",

web-next/src/pages/update/UpdatePage.tsx

@@ -450,7 +450,8 @@ export default function UpdatePage({
 
   // Start download action
   const startDownload = async () => {
-    if (!latest) return;
+    if (!latest || actionInFlight.current || hasActiveJob || canApply) return;
+    actionInFlight.current = true;
     setActionBusy(true);
     setError("");
     setModalError("");
@@ -469,12 +470,14 @@ export default function UpdatePage({
       notify?.(msg, "error");
     } finally {
       setActionBusy(false);
+      actionInFlight.current = false;
     }
   };
 
   // Start apply action
   const startApply = async () => {
-    if (!latest) return;
+    if (!latest || !job || job.status !== "staged" || job.operation !== "download" || actionInFlight.current) return;
+    actionInFlight.current = true;
     setActionBusy(true);
     setError("");
     setModalError("");
@@ -492,6 +495,7 @@ export default function UpdatePage({
       notify?.(msg, "error");
     } finally {
       setActionBusy(false);
+      actionInFlight.current = false;
     }
   };