replace hardcoded download job with download-media script capability

move video/audio downloads off the dedicated ReClip download lane onto the
generic script-job path:

- delete execute-download.ts, reclip-client.ts and the POST /jobs/download
  endpoint; drop the 'download' mode from the pipeline_jobs enum (legacy rows
  tolerated)
- execute-script.ts: strip the @@officer:progress@@ sentinel from the log,
  emit progress events, and isolate viewer/log writes (safeEmit/safeLog) so a
  broadcast or log throw can't wedge the stdout pump
- pipeline-job-manager.ts: persist latest progress; guard sendToViewer sends
- ScriptJobDetail: render the two progress bars; DownloadJobDetail kept for
  legacy history rows
- TaskRunnerModal: ScriptRunner descends into the triggered directory
- VideoDownloadPanel: rewire startJob to the script-job path

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/apps/officer-web/Screens/Dashboard/Jobs/DownloadJobDetail.tsx

@@ -7,8 +7,8 @@ import { toast } from 'sonner';
 // Detail view for a `download` job — a compact two-phase progress readout (metadata → download), polled
 // from the job's persisted progress (the executor emits counter snapshots, not per-item events).
 
-type Counts = { done: number; failed: number; total: number };
-type DownloadProgress = {
+export type Counts = { done: number; failed: number; total: number };
+export type DownloadProgress = {
   phase: 'expanding' | 'metadata' | 'download' | 'done';
   meta: Counts;
   dl: Counts;
@@ -55,7 +55,7 @@ const statusBadge = (status: string) => {
 };
 
 // A labelled progress bar: fill = processed/total; caption states kept/saved vs skipped/failed.
-const PhaseBar = ({
+export const PhaseBar = ({
   label,
   c,
   active,