live pipeline updates during scan via SSE pipeline_changed events

scan emits pipeline_changed every 25 items, rescan endpoints emit on
completion. pipeline page listens and throttle-reloads all column data
(1s debounce) so inbox fills progressively without manual navigation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/api/execute.ts

@@ -154,6 +154,12 @@ export function emitInboxSortProgress(processed: number, total: number): void {
 	for (const l of jobListeners) l(line);
 }
 
+/** Lightweight nudge so the pipeline page refreshes column data. */
+export function emitPipelineChanged(): void {
+	const line = "event: pipeline_changed\ndata: {}\n\n";
+	for (const l of jobListeners) l(line);
+}
+
 /**
  * If the queue runner is idle and the auto_process_queue config is on, kick
  * off a sequential pass over whatever's currently pending. Used by the