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>

apps/api/schema.gql

@@ -128,6 +128,36 @@ type BoardColumn {
   total: Int!
 }
 
+type BulkIssueResult {
+  error: String
+  issueId: ID!
+  ok: Boolean!
+}
+
+type BulkResult {
+  results: [BulkIssueResult!]!
+  updated: Int!
+}
+
+input BulkUpdateIssuesInput {
+  addLabels: [String!]
+  assigneeId: ID
+  issueIds: [ID!]!
+
+  """Out of their release"""
+  noRelease: Boolean
+
+  """Back to the backlog"""
+  noSprint: Boolean
+  priority: IssuePriority
+  releaseId: ID
+  sprintId: ID
+  status: String
+
+  """Unassign everything"""
+  unassign: Boolean
+}
+
 input ChangeIssueStatusInput {
   issueId: ID!
 
@@ -558,6 +588,11 @@ type Mutation {
   """Assign (or unassign with null) a project member"""
   assignIssue(assigneeId: ID, issueId: ID!): CommandResult!
 
+  """
+  The same change on up to 100 tickets; each goes through the normal rules and may refuse on its own
+  """
+  bulkUpdateIssues(input: BulkUpdateIssuesInput!): BulkResult!
+
   """Move a ticket through the workflow (incl. QA)"""
   changeIssueStatus(input: ChangeIssueStatusInput!): CommandResult!
   changeProjectMemberRole(input: ProjectMemberInput!): CommandResult!