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/Dashboard.tsx

@@ -17,6 +17,7 @@ import {
   Grid,
   Group,
   Loader,
+  MultiSelect,
   Paper,
   Select,
   SimpleGrid,
@@ -89,10 +90,16 @@ export function Dashboard({ users }: Props) {
   const [to, setTo] = useState<Date | null>(() => new Date());
   const [assigneeId, setAssigneeId] = useState<string | null>(null);
   const [requester, setRequester] = useState<string | null>(null);
+  const [tags, setTags] = useState<string[]>([]);
+  const [tagOptions, setTagOptions] = useState<string[]>([]);
   const [data, setData] = useState<Metrics | null>(null);
   const [loading, setLoading] = useState(false);
   const [requesterOptions, setRequesterOptions] = useState<string[]>([]);
 
+  useEffect(() => {
+    api.listTags().then(setTagOptions).catch(() => {});
+  }, []);
+
   useEffect(() => {
     let cancelled = false;
     setLoading(true);
@@ -102,6 +109,7 @@ export function Dashboard({ users }: Props) {
         to: fmtDate(to),
         assignee_id: assigneeId || undefined,
         requester: requester || undefined,
+        tags: tags.length > 0 ? tags : undefined,
       })
       .then((m) => {
         if (cancelled) return;
@@ -119,7 +127,7 @@ export function Dashboard({ users }: Props) {
     return () => {
       cancelled = true;
     };
-  }, [from, to, assigneeId, requester]);
+  }, [from, to, assigneeId, requester, tags]);
 
   const userOptions = useMemo(
     () => users.map((u) => ({ value: u.id, label: u.display_name || u.username })),
@@ -240,6 +248,17 @@ export function Dashboard({ users }: Props) {
               searchable
               style={{ minWidth: 160 }}
             />
+            <MultiSelect
+              label="Tags"
+              size="xs"
+              placeholder="Todas"
+              value={tags}
+              onChange={setTags}
+              data={tagOptions}
+              clearable
+              searchable
+              style={{ minWidth: 200 }}
+            />
           </Group>
         </Group>