stream auto review progress over SSE so large inboxes don't feel frozen

sortInbox is now async, yields every 10 items, and emits inbox_sort_start
+ inbox_sort_progress via optional hooks. the pipeline route handler
wires those hooks to the existing job events stream and guards against
a second concurrent sort with a 409.

the inbox column swaps its Auto Review button for a live "Sorting N/T"
counter and progress bar while the sort is in flight; the auto-process
toggle hides to give the progress the full subtitle line. the previous
behaviour was a frozen button for the entire duration of the sort.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/api/execute.ts

@@ -144,6 +144,16 @@ export function emitInboxSorted(result: { moved_to_queue: number; moved_to_revie
 	for (const l of jobListeners) l(line);
 }
 
+export function emitInboxSortStart(total: number): void {
+	const line = `event: inbox_sort_start\ndata: ${JSON.stringify({ total })}\n\n`;
+	for (const l of jobListeners) l(line);
+}
+
+export function emitInboxSortProgress(processed: number, total: number): void {
+	const line = `event: inbox_sort_progress\ndata: ${JSON.stringify({ processed, total })}\n\n`;
+	for (const l of jobListeners) l(line);
+}
+
 /** Parse "Duration: HH:MM:SS.MS" from ffmpeg startup output. */
 function parseFFmpegDuration(line: string): number | null {
 	const match = line.match(/Duration:\s*(\d+):(\d+):(\d+)\.(\d+)/);