feat(timeline): add note toggle i18n keys + regenerate api.ts (REQ-001/007)

Adds timeline_note_show_more / _show_less Paraglide keys (de/en/es) for
the expand/collapse affordance on long event notes. Regenerates api.ts
to include description?: string on TimelineEntryDTO.

Refs #844
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/messages/de.json

@@ -1069,6 +1069,8 @@
 	"timeline_filter_trigger_active": "Filter ({count} aktiv)",
 	"timeline_filter_reset": "Filter zurücksetzen",
 	"timeline_filter_empty_state": "Keine Einträge entsprechen diesen Filtern.",
+	"timeline_note_show_more": "mehr anzeigen",
+	"timeline_note_show_less": "weniger anzeigen",
 	"event_editor_new_title": "Neues Ereignis",
 	"event_editor_edit_title": "Ereignis bearbeiten",
 	"event_editor_section_when": "Wann",

frontend/messages/en.json

@@ -1069,6 +1069,8 @@
 	"timeline_filter_trigger_active": "Filter ({count} active)",
 	"timeline_filter_reset": "Reset filters",
 	"timeline_filter_empty_state": "No entries match these filters.",
+	"timeline_note_show_more": "show more",
+	"timeline_note_show_less": "show less",
 	"event_editor_new_title": "New event",
 	"event_editor_edit_title": "Edit event",
 	"event_editor_section_when": "When",

frontend/messages/es.json

@@ -1069,6 +1069,8 @@
 	"timeline_filter_trigger_active": "Filtro ({count} activos)",
 	"timeline_filter_reset": "Restablecer filtros",
 	"timeline_filter_empty_state": "Ninguna entrada coincide con estos filtros.",
+	"timeline_note_show_more": "mostrar más",
+	"timeline_note_show_less": "mostrar menos",
 	"event_editor_new_title": "Nuevo evento",
 	"event_editor_edit_title": "Editar evento",
 	"event_editor_section_when": "Cuándo",