feat(journey-reader): match spec LR-2 — card layout, interlude, badge, actions; inline note in editor row

JourneyItemCard: restructure from full-<a> to div+card with meta line
(date · von X an Y) and explicit "Brief öffnen →" link; note renders as
mint-border annotation inside the card.

JourneyInterlude: remove ❦ ornament; orange-400 left-border spec classes.

JourneyReader: fix intro classes (dashed border-b); remove bottom author
actions (moved to +page.svelte metabar).

+page.svelte geschichten/[id]: badge above title with spec orange-50 classes;
Bearbeiten/Löschen in metabar right side for isJourney + canBlogWrite.

JourneyItemRow: items-center on main row; drag handle self-center; note
textarea inline in content column (removes border-t section below).

i18n: add journey_item_open, journey_item_meta_from_to to de/en/es.

Tests: update JourneyItemCard + JourneyReader specs to match new structure;
fix datePrecision 'FULL'→'DAY', add receiverCount: 0 to all test fixtures.

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

frontend/messages/de.json

@@ -1175,6 +1175,8 @@
 	"journey_create_submit": "Lesereise erstellen",
 	"journey_item_open_aria": "Brief vom {date} öffnen",
 	"journey_item_open_aria_undated": "Brief öffnen",
+	"journey_item_open": "Brief öffnen",
+	"journey_item_meta_from_to": "von {sender} an {receiver}",
 	"journey_empty_state": "Diese Lesereise ist noch leer.",
 	"journey_interlude_aria_label": "Kuratorennotiz",
 	"journey_selector_aria_live_hint": "Bitte wähle einen Typ aus, um fortzufahren.",

frontend/messages/en.json

@@ -1175,6 +1175,8 @@
 	"journey_create_submit": "Create reading journey",
 	"journey_item_open_aria": "Open letter from {date}",
 	"journey_item_open_aria_undated": "Open letter",
+	"journey_item_open": "Open letter",
+	"journey_item_meta_from_to": "from {sender} to {receiver}",
 	"journey_empty_state": "This reading journey is still empty.",
 	"journey_interlude_aria_label": "Curator's note",
 	"journey_selector_aria_live_hint": "Please select a type to continue.",

frontend/messages/es.json

@@ -1175,6 +1175,8 @@
 	"journey_create_submit": "Crear viaje de lectura",
 	"journey_item_open_aria": "Abrir carta del {date}",
 	"journey_item_open_aria_undated": "Abrir carta",
+	"journey_item_open": "Abrir carta",
+	"journey_item_meta_from_to": "de {sender} a {receiver}",
 	"journey_empty_state": "Este viaje de lectura está vacío.",
 	"journey_interlude_aria_label": "Nota del curador",
 	"journey_selector_aria_live_hint": "Por favor, selecciona un tipo para continuar.",