Fix ReferenceError: move publishStartTime to outer scope so silent failure detection can access it

www/js/version.json

@@ -1,5 +1,5 @@
 {
-  "VERSION": "v0.7.83",
-  "VERSION_NUMBER": "0.7.83",
-  "BUILD_DATE": "2026-06-30T15:24:45.710Z"
+  "VERSION": "v0.7.84",
+  "VERSION_NUMBER": "0.7.84",
+  "BUILD_DATE": "2026-06-30T15:36:36.887Z"
 }

www/ndk-worker.js

@@ -6215,6 +6215,9 @@ async function handlePublish(requestId, event, port) {
         // Track current batch for progress display. Updated by the batch loop.
         let currentBatch = 0;
         let totalBatches = 0;
+        // Debug: track publish start time for timing analysis (defined in outer
+        // scope so the batch loop and silent-failure detection can access it).
+        const publishStartTime = Date.now();
 
         if (isBroadcast && totalTarget > 0) {
             console.log(`[Worker] Broadcasting to ${allBroadcastUrls.length} relays ` +
@@ -6233,9 +6236,6 @@ async function handlePublish(requestId, event, port) {
                 latestRelay: null,
             });
 
-            // Debug: track publish start time for timing analysis
-            const publishStartTime = Date.now();
-
             ndkEvent.on('relay:published', (relay) => {
                 const url = relay?.url || String(relay || '');
                 if (!url) return;