Indexing: Fix overlay race during index rebuild

- Remove the initial `saving_entries` event from `mod.rs` that raced with
  the writer's `RebuildingIndex` event, overriding the phase back to
  "Saving entries... 0%" during the 20–30s `RecreateNameIndex` operation
- Move `resetAggregation()` from scan-complete to scan-started so
  `index-scan-complete` doesn't clear the writer's in-progress phase
- Update the rebuild hint from "Usually takes 2–3 minutes" to "Usually
  less than a minute" to match actual prod timing

Author: vdavid

apps/desktop/src-tauri/src/indexing/mod.rs

@@ -573,18 +573,6 @@ impl IndexManager {
                     // InsertEntriesV2 batches from the channel.
                     writer.set_expected_total_entries(summary.total_entries);
 
-                    // Emit an initial saving_entries event so the UI shows
-                    // progress immediately (the writer may still be processing
-                    // a backlog of InsertEntriesV2 messages).
-                    let _ = app.emit(
-                        "index-aggregation-progress",
-                        serde_json::json!({
-                            "phase": "saving_entries",
-                            "current": 0,
-                            "total": summary.total_entries,
-                        }),
-                    );
-
                     // Flush the writer to ensure all scan batches are committed
                     // before opening the read connection. Without this, the WAL
                     // snapshot may not include the latest InsertEntriesV2 batches,

apps/desktop/src/lib/indexing/ScanStatusOverlay.svelte

@@ -64,7 +64,7 @@
             <div class="agg-content">
                 <span class="scan-label">{aggLabel}</span>
                 {#if aggPhase === 'rebuilding_index'}
-                    <span class="phase-hint">Usually takes 2–3 minutes</span>
+                    <span class="phase-hint">Usually less than a minute</span>
                 {:else if showProgressBar}
                     <div class="progress-row">
                         <div

apps/desktop/src/lib/indexing/index-state.svelte.ts

@@ -91,6 +91,7 @@ export async function initIndexState(): Promise<void> {
     const unlistenStarted = await listen<{ volumeId: string }>('index-scan-started', () => {
         scanning = true
         resetCounters()
+        resetAggregation()
     })
     unlistenHandles.push(unlistenStarted)
 
@@ -113,7 +114,6 @@ export async function initIndexState(): Promise<void> {
         scanning = false
         entriesScanned = event.payload.totalEntries
         dirsFound = event.payload.totalDirs
-        resetAggregation()
     })
     unlistenHandles.push(unlistenComplete)