feat(persons): add confirm dialog to provisional confirm action

Confirming a provisional person was a one-click write — easy to fat-finger
on a touchscreen and irreversible (the person disappears from the review
list, with no obvious undo path). Mirror the destructive-delete pattern
with a non-destructive confirm dialog (destructive: false) so the action
requires a second deliberate click.

New i18n keys (persons_review_confirm_confirm_title/text/button) added
to all three locales (de, en, es).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/messages/de.json

@@ -155,6 +155,9 @@
 	"persons_review_delete_confirm_title": "Person löschen",
 	"persons_review_delete_confirm_text": "Diese Person wird endgültig gelöscht. Dokumentverweise bleiben erhalten, verlieren aber diese Person.",
 	"persons_review_delete_confirm_button": "Person löschen",
+	"persons_review_confirm_confirm_title": "Person bestätigen",
+	"persons_review_confirm_confirm_text": "Diese Person wird als bestätigt markiert und erscheint nicht mehr in der Prüfliste.",
+	"persons_review_confirm_confirm_button": "Bestätigen",
 	"persons_review_merge_label": "Mit welcher Person zusammenführen?",
 	"persons_field_first_name": "Vorname",
 	"persons_field_last_name": "Nachname",

frontend/messages/en.json

@@ -155,6 +155,9 @@
 	"persons_review_delete_confirm_title": "Delete person",
 	"persons_review_delete_confirm_text": "This person will be permanently deleted. Document references are kept but lose this person.",
 	"persons_review_delete_confirm_button": "Delete person",
+	"persons_review_confirm_confirm_title": "Confirm person",
+	"persons_review_confirm_confirm_text": "This person will be marked as confirmed and will no longer appear in the review list.",
+	"persons_review_confirm_confirm_button": "Confirm",
 	"persons_review_merge_label": "Merge into which person?",
 	"persons_field_first_name": "First name",
 	"persons_field_last_name": "Last name",

frontend/messages/es.json

@@ -155,6 +155,9 @@
 	"persons_review_delete_confirm_title": "Eliminar persona",
 	"persons_review_delete_confirm_text": "Esta persona se eliminará de forma permanente. Las referencias de documentos se conservan pero pierden a esta persona.",
 	"persons_review_delete_confirm_button": "Eliminar persona",
+	"persons_review_confirm_confirm_title": "Confirmar persona",
+	"persons_review_confirm_confirm_text": "Esta persona se marcará como confirmada y dejará de aparecer en la lista de revisión.",
+	"persons_review_confirm_confirm_button": "Confirmar",
 	"persons_review_merge_label": "¿Fusionar con qué persona?",
 	"persons_field_first_name": "Nombre",
 	"persons_field_last_name": "Apellido",

frontend/src/lib/person/PersonReviewRow.svelte

@@ -62,7 +62,19 @@ const deleteBtn =
 			>
 				{m.persons_review_action_rename()}
 			</button>
-			<form method="POST" action="?/confirm" use:enhance>
+			<form
+				method="POST"
+				action="?/confirm"
+				use:enhance={async ({ cancel }) => {
+					const ok = await confirm({
+						title: m.persons_review_confirm_confirm_title(),
+						body: m.persons_review_confirm_confirm_text(),
+						confirmLabel: m.persons_review_confirm_confirm_button(),
+						destructive: false
+					});
+					if (!ok) cancel();
+				}}
+			>
 				<input type="hidden" name="id" value={person.id} />
 				<button type="submit" class={actionBtn}>{m.persons_review_action_confirm()}</button>
 			</form>