feat(frontend): wire OCR trigger + review toggle into transcription panel

- OcrTrigger component rendered in the transcription empty state when
  the document has a file and user has write permission
- Review checkmark toggle on each TranscriptionBlock (turquoise when
  reviewed, muted outline when not). Calls PUT .../review to toggle.
- TranscriptionBlockData type: added source + reviewed fields
- +page.svelte: triggerOcr() and reviewToggle() functions wired up
- Paraglide translations (de/en/es) for review toggle + reviewed count

All 687 frontend tests pass.

Refs #226, #230

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

frontend/src/routes/documents/[id]/+page.svelte

@@ -118,6 +118,31 @@ async function deleteBlock(blockId: string) {
 	annotationReloadKey++;
 }
 
+async function reviewToggle(blockId: string) {
+	const res = await fetch(`/api/documents/${doc.id}/transcription-blocks/${blockId}/review`, {
+		method: 'PUT'
+	});
+	if (!res.ok) return;
+	const updated = await res.json();
+	transcriptionBlocks = transcriptionBlocks.map((b) => (b.id === blockId ? updated : b));
+}
+
+async function triggerOcr(scriptType: string) {
+	try {
+		const res = await fetch(`/api/documents/${doc.id}/ocr`, {
+			method: 'POST',
+			headers: { 'Content-Type': 'application/json' },
+			body: JSON.stringify({ scriptType })
+		});
+		if (res.ok) {
+			await loadTranscriptionBlocks();
+			annotationReloadKey++;
+		}
+	} catch (e) {
+		console.error('Failed to trigger OCR:', e);
+	}
+}
+
 async function createBlockFromDraw(rect: {
 	x: number;
 	y: number;
@@ -316,9 +341,13 @@ onMount(() => {
 							canComment={canWrite}
 							currentUserId={currentUserId}
 							activeAnnotationId={activeAnnotationId}
+							storedScriptType={doc.scriptType ?? ''}
+							canRunOcr={canWrite && !!doc.filePath}
 							onBlockFocus={handleBlockFocus}
 							onSaveBlock={saveBlock}
 							onDeleteBlock={deleteBlock}
+							onReviewToggle={reviewToggle}
+							onTriggerOcr={triggerOcr}
 						/>
 					{/if}
 				</div>