Show total items to scan in progress overlay

- Add total_items parameter to broadcast_scan_started and broadcast_scan_progress
- Pass total from SeriesApp to WebSocket broadcasts in AnimeService
- Update JS overlay to show progress bar and current/total count
- Add CSS for progress bar styling
- Add unit tests for new total_items parameter
- All 1024 tests passing

src/server/web/static/css/styles.css

@@ -1978,6 +1978,47 @@ body {
   }
 }
 
+/* Progress bar for scan */
+.scan-progress-bar-container {
+  width: 100%;
+  height: 8px;
+  background-color: var(--color-bg-tertiary);
+  border-radius: 4px;
+  overflow: hidden;
+  margin-bottom: var(--spacing-sm);
+}
+
+.scan-progress-bar {
+  height: 100%;
+  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover, var(--color-accent)));
+  border-radius: 4px;
+  transition: width 0.3s ease;
+}
+
+.scan-progress-container.completed .scan-progress-bar {
+  background: linear-gradient(90deg, var(--color-success), var(--color-success));
+}
+
+.scan-progress-text {
+  font-size: var(--font-size-body);
+  color: var(--color-text-secondary);
+  margin-bottom: var(--spacing-md);
+}
+
+.scan-progress-text #scan-current-count {
+  font-weight: 600;
+  color: var(--color-accent);
+}
+
+.scan-progress-text #scan-total-count {
+  font-weight: 600;
+  color: var(--color-text-primary);
+}
+
+.scan-progress-container.completed .scan-progress-text #scan-current-count {
+  color: var(--color-success);
+}
+
 .scan-progress-stats {
   display: flex;
   justify-content: space-around;