chore(i18n): remove dead transcription_empty_draw_hint key

The key was orphaned when TranscriptionEditView's empty state was replaced
by TranscribeCoachEmptyState. Removed from de/en/es to avoid accumulating
unreferenced strings. (Felix)

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

frontend/messages/de.json

@@ -515,7 +515,6 @@
 	"scan_collapse": "Scan verkleinern",
 	"transcription_empty_title": "Noch keine Transkription",
 	"transcription_empty_desc": "Zeichne Bereiche auf dem Scan und tippe den Text ab, um eine Transkription zu erstellen.",
-	"transcription_empty_draw_hint": "Zeichnen Sie Bereiche auf dem Dokument, um mit der Transkription zu beginnen.",
 	"transcription_panel_close": "Panel schließen",
 	"person_alias_heading": "Namensverlauf",
 	"person_alias_empty": "Noch keine Namensaenderungen erfasst.",

frontend/messages/en.json

@@ -515,7 +515,6 @@
 	"scan_collapse": "Collapse scan",
 	"transcription_empty_title": "No transcription yet",
 	"transcription_empty_desc": "Draw regions on the scan and type the text to create a transcription.",
-	"transcription_empty_draw_hint": "Draw regions on the document to start transcribing.",
 	"transcription_panel_close": "Close panel",
 	"person_alias_heading": "Name history",
 	"person_alias_empty": "No name changes recorded yet.",

frontend/messages/es.json

@@ -515,7 +515,6 @@
 	"scan_collapse": "Reducir escaneo",
 	"transcription_empty_title": "Sin transcripcion",
 	"transcription_empty_desc": "Dibuja regiones en el escaneo y escribe el texto para crear una transcripcion.",
-	"transcription_empty_draw_hint": "Dibuje regiones en el documento para comenzar a transcribir.",
 	"transcription_panel_close": "Cerrar panel",
 	"person_alias_heading": "Historial de nombres",
 	"person_alias_empty": "Aun no se han registrado cambios de nombre.",