fix(issues): board polish — blocked column, drag fix, comment perms, task cleanup

- Add "blocked" to STATUS_ORDER/ALL_STATUSES and board visible columns
- Add min-h-[200px] to droppable columns for reliable empty-column drops
- Fix card click-vs-drag conflict with pointer-events-none on Link
- List view uses STATUS_ORDER from config instead of hardcoded order
- Create Issue dialog: add AssigneePicker for assigning on creation
- Issue detail page syncs from global useIssueStore for real-time updates
- Comment UpdateComment/DeleteComment: add author-or-admin permission check
- DeleteIssue: cancel running agent tasks before deletion

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/features/issues/config/status.ts

@@ -6,6 +6,7 @@ export const STATUS_ORDER: IssueStatus[] = [
   "in_progress",
   "in_review",
   "done",
+  "blocked",
   "cancelled",
 ];
 
@@ -15,6 +16,7 @@ export const ALL_STATUSES: IssueStatus[] = [
   "in_progress",
   "in_review",
   "done",
+  "blocked",
   "cancelled",
 ];