test: update all test files with templateId field

- Add templateId: null to all mock BeadIssue objects across test files
- Ensures type compatibility with updated BeadIssue interface

tests/lib/writeback.test.ts

@@ -32,6 +32,7 @@ test('applyOptimisticStatus updates selected issue status and timestamps', () =>
       priority: 2,
       issue_type: 'task',
       assignee: null,
+      templateId: null,
       owner: null,
       labels: [],
       dependencies: [],