feat: bulk edit tickets

Select several tickets in the backlog and change their status, assignee,
sprint, priority or labels at once. Each ticket goes through the normal
rules and may refuse on its own; the result says which did.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/http/issues.controller.ts

@@ -3,6 +3,7 @@ import {
   Controller,
   Delete,
   Get,
+  HttpCode,
   Param,
   ParseUUIDPipe,
   Patch,
@@ -35,6 +36,7 @@ import { IssueLinkType } from '@task-stream/api/tracker/domain';
 import { withoutNulls } from '../common/issue-input';
 import {
   AssignIssueDto,
+  BulkUpdateIssuesDto,
   ChangeStatusDto,
   ChecklistItemBodyDto,
   CommentBodyDto,
@@ -52,6 +54,7 @@ import {
 } from './dto/requests.dto';
 import {
   ActivityDto,
+  BulkResultDto,
   CommandResultDto,
   CommentPageDto,
   EpicDto,
@@ -59,6 +62,7 @@ import {
   IssuePageDto,
 } from './dto/responses.dto';
 import { viewerOf } from '../common/viewer';
+import { toBulkChange } from '../common/bulk';
 import { Refs } from './refs';
 
 const PROJECT = ApiParam({
@@ -306,6 +310,19 @@ export class IssuesController {
     );
   }
 
+  @Post('issues/bulk')
+  @HttpCode(200)
+  @ApiOperation({
+    summary: 'The same change on up to 100 tickets',
+    description:
+      'Each ticket goes through the normal rules (permissions, workflow, open sprints and releases) and may refuse on its own; the answer says which.',
+  })
+  @ApiOkResponse({ type: BulkResultDto })
+  @ApiCommandErrors()
+  bulkUpdate(@CurrentUser() me: User, @Body() body: BulkUpdateIssuesDto) {
+    return this.issues.bulkUpdate(me.id, body.issueIds, toBulkChange(body));
+  }
+
   @Put('issues/:issue/parent')
   @ISSUE
   @ApiOperation({