Start the sync time at 00:00

The server now sends sync times as minutes and seconds, so the placeholder
shown before the first progress update matches.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/items/SyncProgressModal.vue

@@ -81,7 +81,7 @@ export default {
     data() {
         return {
             progress: 0,
-            timeSpent: "00:00:00",
+            timeSpent: "00:00",
             syncComplete: false,
             syncData: {
                 soundtracks_added: [],
@@ -181,7 +181,7 @@ export default {
                 if (this.syncInProgress) {
                     // New sync in progress - start polling
                     this.progress = 0;
-                    this.timeSpent = "00:00:00";
+                    this.timeSpent = "00:00";
                     this.syncComplete = false;
                     this.syncData = {
                         soundtracks_added: [],