* chore: renderer test coverage
* fix: lint
* chore: api tests
* chore: tests for app reducer and StartGradeButton
* chore: lint
* fix: update reducer tests
* chore: more test coverage
* chore: test coverage
* chore: update test for merge conflicts
* feat: add file renderer that support common error handling and loading banner
* chore: use axios instead of get from utils
* chore: fixed typo and update snapshots