Add activity priority desk filter and keep detail browsing inside the same column after stage changes.

When done/reopen/stage moves leave a column, advance to the next activity there or return to the list if empty.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/activities/activities.service.ts

@@ -123,6 +123,7 @@ type ListFacets = {
   customer?: string;
   /** set = زمان شروع دارد، unset = ندارد */
   due?: 'set' | 'unset';
+  priority?: ActivityDto['priority'];
   /** گروه فعالیت؛ خالی = همهٔ گروه‌ها */
   boardId?: string;
 };
@@ -1369,11 +1370,13 @@ export class ActivitiesService {
     const facetTypeDef = facets?.typeDefId?.trim();
     const facetTitle = facets?.title?.trim();
     const facetCustomer = facets?.customer?.trim();
+    const facetPriority = facets?.priority;
     const andParts: Prisma.ActivityWhereInput[] = [
       scope,
       ...(facets?.type ? [{ type: facets.type }] : []),
       ...(facetTypeDef ? [this.types.whereForType(typeRows, facetTypeDef)] : []),
       ...(facets?.status ? [{ status: facets.status }] : []),
+      ...(facetPriority ? [{ priority: facetPriority }] : []),
       ...(facetTitle ? [{ title: ci(facetTitle) }] : []),
       ...(facetCustomer ? [this.customerWhere(facetCustomer)] : []),
       ...(facetAssignee