feat(kanban): deadlines en cards (context menu, badges, calendario, history)

- migration 009 + columna deadline TEXT en cards
- backend: CardPatch.HasDeadline, eventos deadline_set/deadline_cleared
- KanbanCard: menu derecho con DatePicker, badge countdown con colores por ratio (azul>=50%, amarillo<50%, rojo<10%, red.9 overdue)
- App.tsx: filtro "Con deadline", handleSetCardDeadline optimista, jump-to-card + highlight
- CalendarView: popover por dia con seq_num + titulo, click navega a card en tablero
- HistoryModal: render eventos deadline_set/deadline_cleared
- .gitignore: *.log

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/KanbanColumn.tsx

@@ -54,6 +54,10 @@ interface Props {
   onShowHistory: (card: Card) => void;
   onToggleCardLock: (id: string, locked: boolean) => void;
   onAssignCard: (id: string, assignee_id: string | null) => void;
+  onSetCardDeadline?: (id: string, deadline: string | null) => void;
+  onSetRequester?: (id: string, requester: string) => void;
+  requesterOptions?: string[];
+  onOpenCustomCardColor?: (cardId: string, current: string) => void;
   activeSticker?: string | null;
   onAddSticker?: (cardId: string, x: number, y: number) => void;
   onRemoveSticker?: (cardId: string, index: number) => void;
@@ -61,6 +65,7 @@ interface Props {
   onCommitSticker?: (cardId: string) => void;
   users: User[];
   usersById: Map<string, User>;
+  highlightCardId?: string | null;
 }
 
 function KanbanColumnImpl({
@@ -81,6 +86,10 @@ function KanbanColumnImpl({
   onShowHistory,
   onToggleCardLock,
   onAssignCard,
+  onSetCardDeadline,
+  onSetRequester,
+  requesterOptions,
+  onOpenCustomCardColor,
   activeSticker,
   onAddSticker,
   onRemoveSticker,
@@ -88,6 +97,7 @@ function KanbanColumnImpl({
   onCommitSticker,
   users,
   usersById,
+  highlightCardId,
 }: Props) {
   const [renaming, setRenaming] = useState(false);
   const [name, setName] = useState(column.name);
@@ -415,9 +425,14 @@ function KanbanColumnImpl({
                     onShowHistory={onShowHistory}
                     onToggleLock={onToggleCardLock}
                     onAssign={onAssignCard}
+                    onSetDeadline={onSetCardDeadline}
+                    onSetRequester={onSetRequester}
+                    requesterOptions={requesterOptions}
+                    onOpenCustomColor={onOpenCustomCardColor}
                     users={users}
                     assignee={c.assignee_id ? usersById.get(c.assignee_id) : undefined}
                     inDoneColumn={column.is_done}
+                    highlight={highlightCardId === c.id}
                     activeSticker={activeSticker}
                     onAddSticker={onAddSticker}
                     onRemoveSticker={onRemoveSticker}