fix(#240): accessibility, color consistency, and reviewedPct denominator

- TranscriptionColumn progress bar: add aria-hidden="true" (the block count
  text above already communicates the value to screen readers)
- TranscriptionColumn weekly pulse: text-ink → text-ink-2 (matches
  SegmentationColumn, same semantic element)
- ReadyColumn reviewedPct: align denominator to annotationCount so the
  displayed percentage matches the SQL threshold used to classify "ready"
- page.svelte.spec.ts: add missing segmentationDocs/transcriptionDocs/
  readyDocs/weeklyStats to emptyData fixture

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/components/ReadyColumn.svelte

@@ -27,8 +27,8 @@ function formatDate(dateStr: string): string {
 }
 
 function reviewedPct(doc: TranscriptionQueueItemDTO): number {
-	if (doc.textedBlockCount === 0) return 0;
-	return Math.round((doc.reviewedBlockCount / doc.textedBlockCount) * 100);
+	if (doc.annotationCount === 0) return 0;
+	return Math.round((doc.reviewedBlockCount / doc.annotationCount) * 100);
 }
 </script>