feat(ocr): extract translateOcrProgress with ANALYZING_PAGE and DONE:skipped support

Move translateOcrProgress from page.svelte to a testable module.
Return structured result with currentPage/totalPages/skippedPages
for the progress bar. Add ANALYZING_PAGE and DONE with skipped pages
parsing. Add i18n keys for de/en/es.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/messages/de.json

@@ -526,6 +526,8 @@
 	"ocr_status_analyzing": "OCR-Analyse läuft — dies kann einige Minuten dauern…",
 	"ocr_status_creating_blocks": "{count} Textblöcke erkannt — erstelle Transkription…",
 	"ocr_status_done_blocks": "{count} Blöcke erstellt",
+	"ocr_status_analyzing_page": "Seite {current} von {total} wird analysiert…",
+	"ocr_status_done_skipped": "{count} Blöcke erstellt, {skipped} Seite(n) übersprungen",
 	"ocr_status_error": "OCR fehlgeschlagen",
 	"transcription_block_review": "Als geprüft markieren",
 	"transcription_block_unreview": "Markierung aufheben",

frontend/messages/en.json

@@ -526,6 +526,8 @@
 	"ocr_status_analyzing": "OCR analysis running — this may take a few minutes…",
 	"ocr_status_creating_blocks": "{count} text blocks detected — creating transcription…",
 	"ocr_status_done_blocks": "{count} blocks created",
+	"ocr_status_analyzing_page": "Analyzing page {current} of {total}…",
+	"ocr_status_done_skipped": "{count} blocks created, {skipped} page(s) skipped",
 	"ocr_status_error": "OCR failed",
 	"transcription_block_review": "Mark as reviewed",
 	"transcription_block_unreview": "Unmark as reviewed",

frontend/messages/es.json

@@ -526,6 +526,8 @@
 	"ocr_status_analyzing": "Análisis OCR en curso — esto puede tardar unos minutos…",
 	"ocr_status_creating_blocks": "{count} bloques de texto detectados — creando transcripción…",
 	"ocr_status_done_blocks": "{count} bloques creados",
+	"ocr_status_analyzing_page": "Analizando página {current} de {total}…",
+	"ocr_status_done_skipped": "{count} bloques creados, {skipped} página(s) omitida(s)",
 	"ocr_status_error": "OCR fallido",
 	"transcription_block_review": "Marcar como revisado",
 	"transcription_block_unreview": "Desmarcar como revisado",