Fix test compilation and runtime issues from PR review feedback#48

Draft

Copilot wants to merge 3 commits intoadd-backend-tests-16104220138383017423from

copilot/sub-pr-47

Commits on Feb 24, 2026

Initial plan
Copilot
committed
Fix PR review issues in test files: mock syntax, @InjectMocks, comments, mutableMapOf

Copilot
and
RobotHanzo
committed
Resolve merge conflicts: align test files with base branch ce996d8

Copilot
and
RobotHanzo
committed