feat(calendar): add drag-create, resize, recurring scope, quick-create, and duplication

- Click-drag on empty time slots to create events with pre-filled time range
- Resize events by dragging bottom edge (15-min snap, optimistic JMAP update)
- Recurring event edit/delete scope dialog (this/following/all occurrences)
- Double-click quick event creation with inline title input
- Event duplication button in modal (+1 day offset)
- Shared interaction hook for pointer-based calendar interactions

Fixes #13

locales/de/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "Ganztägig",
       "more": "+{count} weitere",
       "no_title": "(Kein Titel)",
+      "resize": "Termingröße ändern",
+      "duplicate": "Duplizieren",
       "today_header": "Heute",
       "tomorrow_header": "Morgen"
     },
+    "detail": {
+      "add_note": "Notiz hinzufügen...",
+      "save_note": "Speichern",
+      "note_saved": "Notiz hinzugefügt",
+      "open_link": "Link öffnen",
+      "meeting_link": "Besprechungslink",
+      "tentative": "Vorläufig",
+      "cancelled": "Abgesagt",
+      "delete_confirm": "Dieses Ereignis löschen?"
+    },
     "form": {
       "title": "Titel",
       "description": "Beschreibung",
@@ -1230,6 +1242,17 @@
       "until": "Bis",
       "occurrences": "{count} Wiederholungen"
     },
+    "recurrence_scope": {
+      "edit_title": "Wiederkehrendes Ereignis bearbeiten",
+      "delete_title": "Wiederkehrendes Ereignis löschen",
+      "description": "Dies ist ein wiederkehrendes Ereignis. Welche Ereignisse möchten Sie ändern?",
+      "this_event": "Nur dieses Ereignis",
+      "this_and_future": "Dieses und folgende Ereignisse",
+      "all_events": "Alle Ereignisse",
+      "cancel": "Abbrechen",
+      "save": "Speichern",
+      "delete": "Löschen"
+    },
     "alerts": {
       "title": "Erinnerung",
       "none": "Keine Erinnerung",
@@ -1275,17 +1298,24 @@
       "calendar_created": "Kalender erstellt",
       "calendar_deleted": "Kalender gelöscht",
       "event_move_error": "Termin konnte nicht verschoben werden",
+      "event_resize_error": "Termingröße konnte nicht geändert werden",
       "alert_title": "Bevorstehender Termin",
       "alert_now": "Beginnt jetzt",
       "alert_in_minutes": "In {count} Min.",
       "invitation_sent": "Einladungen gesendet",
       "rsvp_updated": "Antwort aktualisiert",
-      "rsvp_error": "Antwort konnte nicht aktualisiert werden"
+      "rsvp_error": "Antwort konnte nicht aktualisiert werden",
+      "event_duplicated": "Termin dupliziert",
+      "event_error": "Termin konnte nicht gespeichert werden"
     },
     "status": {
       "loading_calendars": "Kalender werden geladen...",
       "loading_events": "Termine werden geladen..."
     },
+    "quick_create": {
+      "placeholder": "Titel des neuen Termins",
+      "aria_label": "Schnellerstellung eines Termins"
+    },
     "nav_prev": "Zurück",
     "nav_next": "Weiter",
     "import": {

locales/en/common.json

@@ -1182,9 +1182,21 @@
       "all_day": "All day",
       "more": "+{count} more",
       "no_title": "(No title)",
+      "resize": "Resize event",
+      "duplicate": "Duplicate",
       "today_header": "Today",
       "tomorrow_header": "Tomorrow"
     },
+    "detail": {
+      "add_note": "Add a note...",
+      "save_note": "Save",
+      "note_saved": "Note added",
+      "open_link": "Open link",
+      "meeting_link": "Meeting link",
+      "tentative": "Tentative",
+      "cancelled": "Cancelled",
+      "delete_confirm": "Delete this event?"
+    },
     "form": {
       "title": "Title",
       "description": "Description",
@@ -1235,6 +1247,17 @@
       "until": "Until",
       "occurrences": "{count} occurrences"
     },
+    "recurrence_scope": {
+      "edit_title": "Edit recurring event",
+      "delete_title": "Delete recurring event",
+      "description": "This is a recurring event. Which events would you like to modify?",
+      "this_event": "This event only",
+      "this_and_future": "This and following events",
+      "all_events": "All events",
+      "cancel": "Cancel",
+      "save": "Save",
+      "delete": "Delete"
+    },
     "alerts": {
       "title": "Reminder",
       "none": "No reminder",
@@ -1280,17 +1303,24 @@
       "calendar_created": "Calendar created",
       "calendar_deleted": "Calendar deleted",
       "event_move_error": "Failed to move event",
+      "event_resize_error": "Failed to resize event",
       "alert_title": "Upcoming event",
       "alert_now": "Starting now",
       "alert_in_minutes": "In {count} min",
       "invitation_sent": "Invitations sent",
       "rsvp_updated": "Response updated",
-      "rsvp_error": "Failed to update response"
+      "rsvp_error": "Failed to update response",
+      "event_duplicated": "Event duplicated",
+      "event_error": "Failed to save event"
     },
     "status": {
       "loading_calendars": "Loading calendars...",
       "loading_events": "Loading events..."
     },
+    "quick_create": {
+      "placeholder": "New event title",
+      "aria_label": "Quick create event"
+    },
     "nav_prev": "Previous",
     "nav_next": "Next",
     "import": {

locales/es/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "Todo el día",
       "more": "+{count} más",
       "no_title": "(Sin título)",
+      "resize": "Redimensionar evento",
+      "duplicate": "Duplicar",
       "today_header": "Hoy",
       "tomorrow_header": "Mañana"
     },
+    "detail": {
+      "add_note": "Añadir una nota...",
+      "save_note": "Guardar",
+      "note_saved": "Nota añadida",
+      "open_link": "Abrir enlace",
+      "meeting_link": "Enlace de reunión",
+      "tentative": "Provisional",
+      "cancelled": "Cancelado",
+      "delete_confirm": "¿Eliminar este evento?"
+    },
     "form": {
       "title": "Título",
       "description": "Descripción",
@@ -1230,6 +1242,17 @@
       "until": "Hasta",
       "occurrences": "{count} repeticiones"
     },
+    "recurrence_scope": {
+      "edit_title": "Editar evento recurrente",
+      "delete_title": "Eliminar evento recurrente",
+      "description": "Este es un evento recurrente. ¿Qué eventos desea modificar?",
+      "this_event": "Solo este evento",
+      "this_and_future": "Este evento y los siguientes",
+      "all_events": "Todos los eventos",
+      "cancel": "Cancelar",
+      "save": "Guardar",
+      "delete": "Eliminar"
+    },
     "alerts": {
       "title": "Recordatorio",
       "none": "Sin recordatorio",
@@ -1275,17 +1298,24 @@
       "calendar_created": "Calendario creado",
       "calendar_deleted": "Calendario eliminado",
       "event_move_error": "Error al mover el evento",
+      "event_resize_error": "Error al redimensionar el evento",
       "alert_title": "Evento próximo",
       "alert_now": "Comienza ahora",
       "alert_in_minutes": "En {count} min",
       "invitation_sent": "Invitaciones enviadas",
       "rsvp_updated": "Respuesta actualizada",
-      "rsvp_error": "Error al actualizar la respuesta"
+      "rsvp_error": "Error al actualizar la respuesta",
+      "event_duplicated": "Evento duplicado",
+      "event_error": "Error al guardar el evento"
     },
     "status": {
       "loading_calendars": "Cargando calendarios...",
       "loading_events": "Cargando eventos..."
     },
+    "quick_create": {
+      "placeholder": "Título del nuevo evento",
+      "aria_label": "Creación rápida de evento"
+    },
     "nav_prev": "Anterior",
     "nav_next": "Siguiente",
     "import": {

locales/fr/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "Toute la journée",
       "more": "+{count} de plus",
       "no_title": "(Sans titre)",
+      "resize": "Redimensionner l'événement",
+      "duplicate": "Dupliquer",
       "today_header": "Aujourd'hui",
       "tomorrow_header": "Demain"
     },
+    "detail": {
+      "add_note": "Ajouter une note...",
+      "save_note": "Enregistrer",
+      "note_saved": "Note ajoutée",
+      "open_link": "Ouvrir le lien",
+      "meeting_link": "Lien de réunion",
+      "tentative": "Provisoire",
+      "cancelled": "Annulé",
+      "delete_confirm": "Supprimer cet événement ?"
+    },
     "form": {
       "title": "Titre",
       "description": "Description",
@@ -1230,6 +1242,17 @@
       "until": "Jusqu'au",
       "occurrences": "{count} occurrences"
     },
+    "recurrence_scope": {
+      "edit_title": "Modifier l'événement récurrent",
+      "delete_title": "Supprimer l'événement récurrent",
+      "description": "Ceci est un événement récurrent. Quels événements souhaitez-vous modifier ?",
+      "this_event": "Cet événement uniquement",
+      "this_and_future": "Cet événement et les suivants",
+      "all_events": "Tous les événements",
+      "cancel": "Annuler",
+      "save": "Enregistrer",
+      "delete": "Supprimer"
+    },
     "alerts": {
       "title": "Rappel",
       "none": "Aucun rappel",
@@ -1275,17 +1298,24 @@
       "calendar_created": "Calendrier créé",
       "calendar_deleted": "Calendrier supprimé",
       "event_move_error": "Échec du déplacement de l'événement",
+      "event_resize_error": "Échec du redimensionnement de l'événement",
       "alert_title": "Événement à venir",
       "alert_now": "Commence maintenant",
       "alert_in_minutes": "Dans {count} min",
       "invitation_sent": "Invitations envoyées",
       "rsvp_updated": "Réponse mise à jour",
-      "rsvp_error": "Échec de la mise à jour de la réponse"
+      "rsvp_error": "Échec de la mise à jour de la réponse",
+      "event_duplicated": "Événement dupliqué",
+      "event_error": "Échec de l'enregistrement de l'événement"
     },
     "status": {
       "loading_calendars": "Chargement des calendriers...",
       "loading_events": "Chargement des événements..."
     },
+    "quick_create": {
+      "placeholder": "Titre du nouvel événement",
+      "aria_label": "Création rapide d'événement"
+    },
     "nav_prev": "Précédent",
     "nav_next": "Suivant",
     "import": {

locales/it/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "Tutto il giorno",
       "more": "+{count} altri",
       "no_title": "(Senza titolo)",
+      "resize": "Ridimensiona evento",
+      "duplicate": "Duplica",
       "today_header": "Oggi",
       "tomorrow_header": "Domani"
     },
+    "detail": {
+      "add_note": "Aggiungi una nota...",
+      "save_note": "Salva",
+      "note_saved": "Nota aggiunta",
+      "open_link": "Apri link",
+      "meeting_link": "Link riunione",
+      "tentative": "Provvisorio",
+      "cancelled": "Annullato",
+      "delete_confirm": "Eliminare questo evento?"
+    },
     "form": {
       "title": "Titolo",
       "description": "Descrizione",
@@ -1230,6 +1242,17 @@
       "until": "Fino al",
       "occurrences": "{count} ripetizioni"
     },
+    "recurrence_scope": {
+      "edit_title": "Modifica evento ricorrente",
+      "delete_title": "Elimina evento ricorrente",
+      "description": "Questo è un evento ricorrente. Quali eventi desideri modificare?",
+      "this_event": "Solo questo evento",
+      "this_and_future": "Questo evento e i seguenti",
+      "all_events": "Tutti gli eventi",
+      "cancel": "Annulla",
+      "save": "Salva",
+      "delete": "Elimina"
+    },
     "alerts": {
       "title": "Promemoria",
       "none": "Nessun promemoria",
@@ -1275,17 +1298,24 @@
       "calendar_created": "Calendario creato",
       "calendar_deleted": "Calendario eliminato",
       "event_move_error": "Spostamento dell'evento non riuscito",
+      "event_resize_error": "Ridimensionamento dell'evento non riuscito",
       "alert_title": "Evento in arrivo",
       "alert_now": "Inizia ora",
       "alert_in_minutes": "Tra {count} min",
       "invitation_sent": "Inviti inviati",
       "rsvp_updated": "Risposta aggiornata",
-      "rsvp_error": "Impossibile aggiornare la risposta"
+      "rsvp_error": "Impossibile aggiornare la risposta",
+      "event_duplicated": "Evento duplicato",
+      "event_error": "Salvataggio dell'evento non riuscito"
     },
     "status": {
       "loading_calendars": "Caricamento calendari...",
       "loading_events": "Caricamento eventi..."
     },
+    "quick_create": {
+      "placeholder": "Titolo del nuovo evento",
+      "aria_label": "Creazione rapida evento"
+    },
     "nav_prev": "Precedente",
     "nav_next": "Successivo",
     "import": {

locales/ja/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "終日",
       "more": "他{count}件",
       "no_title": "(タイトルなし)",
+      "resize": "イベントのサイズ変更",
+      "duplicate": "複製",
       "today_header": "今日",
       "tomorrow_header": "明日"
     },
+    "detail": {
+      "add_note": "メモを追加...",
+      "save_note": "保存",
+      "note_saved": "メモを追加しました",
+      "open_link": "リンクを開く",
+      "meeting_link": "会議リンク",
+      "tentative": "仮",
+      "cancelled": "キャンセル済み",
+      "delete_confirm": "このイベントを削除しますか？"
+    },
     "form": {
       "title": "タイトル",
       "description": "説明",
@@ -1230,6 +1242,17 @@
       "until": "終了日",
       "occurrences": "{count}回"
     },
+    "recurrence_scope": {
+      "edit_title": "繰り返しイベントを編集",
+      "delete_title": "繰り返しイベントを削除",
+      "description": "これは繰り返しイベントです。どのイベントを変更しますか？",
+      "this_event": "このイベントのみ",
+      "this_and_future": "これ以降のすべてのイベント",
+      "all_events": "すべてのイベント",
+      "cancel": "キャンセル",
+      "save": "保存",
+      "delete": "削除"
+    },
     "alerts": {
       "title": "リマインダー",
       "none": "リマインダーなし",
@@ -1275,17 +1298,24 @@
       "calendar_created": "カレンダーを作成しました",
       "calendar_deleted": "カレンダーを削除しました",
       "event_move_error": "イベントの移動に失敗しました",
+      "event_resize_error": "イベントのサイズ変更に失敗しました",
       "alert_title": "予定のイベント",
       "alert_now": "まもなく開始",
       "alert_in_minutes": "{count}分後",
       "invitation_sent": "招待を送信しました",
       "rsvp_updated": "回答を更新しました",
-      "rsvp_error": "回答の更新に失敗しました"
+      "rsvp_error": "回答の更新に失敗しました",
+      "event_duplicated": "予定を複製しました",
+      "event_error": "予定の保存に失敗しました"
     },
     "status": {
       "loading_calendars": "カレンダーを読み込み中...",
       "loading_events": "予定を読み込み中..."
     },
+    "quick_create": {
+      "placeholder": "新しい予定のタイトル",
+      "aria_label": "予定をすばやく作成"
+    },
     "nav_prev": "前へ",
     "nav_next": "次へ",
     "import": {

locales/nl/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "Hele dag",
       "more": "+{count} meer",
       "no_title": "(Geen titel)",
+      "resize": "Evenement formaat wijzigen",
+      "duplicate": "Dupliceren",
       "today_header": "Vandaag",
       "tomorrow_header": "Morgen"
     },
+    "detail": {
+      "add_note": "Notitie toevoegen...",
+      "save_note": "Opslaan",
+      "note_saved": "Notitie toegevoegd",
+      "open_link": "Link openen",
+      "meeting_link": "Vergaderlink",
+      "tentative": "Voorlopig",
+      "cancelled": "Geannuleerd",
+      "delete_confirm": "Dit evenement verwijderen?"
+    },
     "form": {
       "title": "Titel",
       "description": "Beschrijving",
@@ -1230,6 +1242,17 @@
       "until": "Tot",
       "occurrences": "{count} herhalingen"
     },
+    "recurrence_scope": {
+      "edit_title": "Terugkerend evenement bewerken",
+      "delete_title": "Terugkerend evenement verwijderen",
+      "description": "Dit is een terugkerend evenement. Welke evenementen wilt u wijzigen?",
+      "this_event": "Alleen dit evenement",
+      "this_and_future": "Dit en volgende evenementen",
+      "all_events": "Alle evenementen",
+      "cancel": "Annuleren",
+      "save": "Opslaan",
+      "delete": "Verwijderen"
+    },
     "alerts": {
       "title": "Herinnering",
       "none": "Geen herinnering",
@@ -1275,17 +1298,24 @@
       "calendar_created": "Agenda aangemaakt",
       "calendar_deleted": "Agenda verwijderd",
       "event_move_error": "Evenement verplaatsen mislukt",
+      "event_resize_error": "Evenement formaat wijzigen mislukt",
       "alert_title": "Aankomend evenement",
       "alert_now": "Begint nu",
       "alert_in_minutes": "Over {count} min",
       "invitation_sent": "Uitnodigingen verzonden",
       "rsvp_updated": "Reactie bijgewerkt",
-      "rsvp_error": "Reactie kon niet worden bijgewerkt"
+      "rsvp_error": "Reactie kon niet worden bijgewerkt",
+      "event_duplicated": "Evenement gedupliceerd",
+      "event_error": "Evenement opslaan mislukt"
     },
     "status": {
       "loading_calendars": "Agenda's laden...",
       "loading_events": "Evenementen laden..."
     },
+    "quick_create": {
+      "placeholder": "Titel nieuw evenement",
+      "aria_label": "Snel evenement aanmaken"
+    },
     "nav_prev": "Vorige",
     "nav_next": "Volgende",
     "import": {

locales/pt/common.json

@@ -1177,9 +1177,21 @@
       "all_day": "Dia inteiro",
       "more": "+{count} mais",
       "no_title": "(Sem título)",
+      "resize": "Redimensionar evento",
+      "duplicate": "Duplicar",
       "today_header": "Hoje",
       "tomorrow_header": "Amanhã"
     },
+    "detail": {
+      "add_note": "Adicionar uma nota...",
+      "save_note": "Salvar",
+      "note_saved": "Nota adicionada",
+      "open_link": "Abrir link",
+      "meeting_link": "Link da reunião",
+      "tentative": "Provisório",
+      "cancelled": "Cancelado",
+      "delete_confirm": "Excluir este evento?"
+    },
     "form": {
       "title": "Título",
       "description": "Descrição",
@@ -1230,6 +1242,17 @@
       "until": "Até",
       "occurrences": "{count} repetições"
     },
+    "recurrence_scope": {
+      "edit_title": "Editar evento recorrente",
+      "delete_title": "Excluir evento recorrente",
+      "description": "Este é um evento recorrente. Quais eventos você deseja modificar?",
+      "this_event": "Apenas este evento",
+      "this_and_future": "Este evento e os seguintes",
+      "all_events": "Todos os eventos",
+      "cancel": "Cancelar",
+      "save": "Salvar",
+      "delete": "Excluir"
+    },
     "alerts": {
       "title": "Lembrete",
       "none": "Sem lembrete",
@@ -1275,17 +1298,24 @@
       "calendar_created": "Calendário criado",
       "calendar_deleted": "Calendário excluído",
       "event_move_error": "Falha ao mover o evento",
+      "event_resize_error": "Falha ao redimensionar o evento",
       "alert_title": "Evento próximo",
       "alert_now": "Começa agora",
       "alert_in_minutes": "Em {count} min",
       "invitation_sent": "Convites enviados",
       "rsvp_updated": "Resposta atualizada",
-      "rsvp_error": "Falha ao atualizar resposta"
+      "rsvp_error": "Falha ao atualizar resposta",
+      "event_duplicated": "Evento duplicado",
+      "event_error": "Falha ao salvar o evento"
     },
     "status": {
       "loading_calendars": "Carregando calendários...",
       "loading_events": "Carregando eventos..."
     },
+    "quick_create": {
+      "placeholder": "Título do novo evento",
+      "aria_label": "Criação rápida de evento"
+    },
     "nav_prev": "Anterior",
     "nav_next": "Próximo",
     "import": {