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/snapshot-differ.test.ts

@@ -21,6 +21,7 @@ function createMockIssue(id: string, overrides: Partial<BeadIssueWithProject> =
     priority: 2,
     issue_type: 'task',
     assignee: null,
+    templateId: null,
     owner: 'owner',
     labels: [],
     dependencies: [],