fix(issues): use context-based view store in IssuesHeader

IssuesHeader was hardcoded to use the global useIssueViewStore,
ignoring the ViewStoreProvider context. This meant scope tabs,
filters, sort, and view mode toggles had no effect when IssuesHeader
was mounted inside a project-scoped ViewStoreProvider.

Switched all reads/writes to useViewStore/useViewStoreApi from the
context. The global IssuesPage already wraps in ViewStoreProvider
with the global store, so behavior is unchanged there.

packages/views/issues/components/issues-header.tsx

@@ -48,11 +48,11 @@ import { useWorkspaceId } from "@multica/core/hooks";
 import { memberListOptions, agentListOptions } from "@multica/core/workspace/queries";
 import { ActorAvatar } from "../../common/actor-avatar";
 import {
-  useIssueViewStore,
   SORT_OPTIONS,
   CARD_PROPERTY_OPTIONS,
   type ActorFilterValue,
 } from "@multica/core/issues/stores/view-store";
+import { useViewStore, useViewStoreApi } from "@multica/core/issues/stores/view-store-context";
 import {
   useIssuesScopeStore,
   type IssuesScope,
@@ -279,16 +279,16 @@ export function IssuesHeader({ scopedIssues }: { scopedIssues: Issue[] }) {
   const scope = useIssuesScopeStore((s) => s.scope);
   const setScope = useIssuesScopeStore((s) => s.setScope);
 
-  const viewMode = useIssueViewStore((s) => s.viewMode);
-  const statusFilters = useIssueViewStore((s) => s.statusFilters);
-  const priorityFilters = useIssueViewStore((s) => s.priorityFilters);
-  const assigneeFilters = useIssueViewStore((s) => s.assigneeFilters);
-  const includeNoAssignee = useIssueViewStore((s) => s.includeNoAssignee);
-  const creatorFilters = useIssueViewStore((s) => s.creatorFilters);
-  const sortBy = useIssueViewStore((s) => s.sortBy);
-  const sortDirection = useIssueViewStore((s) => s.sortDirection);
-  const cardProperties = useIssueViewStore((s) => s.cardProperties);
-  const act = useIssueViewStore.getState();
+  const viewMode = useViewStore((s) => s.viewMode);
+  const statusFilters = useViewStore((s) => s.statusFilters);
+  const priorityFilters = useViewStore((s) => s.priorityFilters);
+  const assigneeFilters = useViewStore((s) => s.assigneeFilters);
+  const includeNoAssignee = useViewStore((s) => s.includeNoAssignee);
+  const creatorFilters = useViewStore((s) => s.creatorFilters);
+  const sortBy = useViewStore((s) => s.sortBy);
+  const sortDirection = useViewStore((s) => s.sortDirection);
+  const cardProperties = useViewStore((s) => s.cardProperties);
+  const act = useViewStoreApi().getState();
 
   const counts = useIssueCounts(scopedIssues);