remove standalone subtitle extract, unify done semantics, fix nav active matching

Subtitle extraction lives only in the pipeline now; a file is 'done' when it
matches the desired end state — no embedded subs AND audio matches the
language config. The separate Extract page was redundant.

- delete src/routes/review/subtitles/extract.tsx + SubtitleExtractPage
- delete /api/subtitles/extract-all + /:id/extract endpoints
- delete buildExtractOnlyCommand + unused buildExtractionOutputs from ffmpeg.ts
- detail page: drop Extract button + extractCommand textarea, replace with
  'will be extracted via pipeline' note when embedded subs present
- pipeline endpoint: doneCount = is_noop OR status='done' (a file in the
  desired state, however it got there); UI label 'N files in desired state'
- nav: drop the now-defunct 'Extract subs' link, default activeOptions.exact
  to false so detail subpages (e.g. /review/audio/123) highlight their
  parent ('Audio') in the menu — was the cause of the broken-feeling menu

server/api/review.ts

@@ -281,7 +281,17 @@ app.get("/pipeline", (c) => {
 	`)
 		.all();
 
-	const noops = db.prepare("SELECT COUNT(*) as count FROM review_plans WHERE is_noop = 1").get() as { count: number };
+	// "Done" = files that are already in the desired end state. Two ways
+	// to get there: (a) the analyzer says nothing to do (is_noop=1), or
+	// (b) we ran a job that finished. Both count toward the same total.
+	const doneCount = (
+		db
+			.prepare(`
+		SELECT COUNT(*) as count FROM review_plans
+		WHERE is_noop = 1 OR status = 'done'
+	`)
+			.get() as { count: number }
+	).count;
 
 	// Batch transcode reasons for all review plans in one query (avoids N+1)
 	const planIds = (review as { id: number }[]).map((r) => r.id);
@@ -305,7 +315,7 @@ app.get("/pipeline", (c) => {
 		item.transcode_reasons = reasonsByPlan.get(item.id) ?? [];
 	}
 
-	return c.json({ review, queued, processing, done, noopCount: noops.count, jellyfinUrl });
+	return c.json({ review, queued, processing, done, doneCount, jellyfinUrl });
 });
 
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