test: add coverage for CSP theme-init scripts and navbar handlers #182

Job	Run time
Verify prod requirements.txt is sufficient	10s
mypy	25s
ruff + pip-audit (macos-latest)	30s
Performance benchmarks (informational)	35s
pytest (macos-latest)	29s
pytest (windows-latest)	1m 11s
ruff + pip-audit (ubuntu-latest)	20s
API integration tests + coverage (ubuntu-latest)	20s
Frontend unit tests (vitest) (macos-latest)	31s
Frontend unit tests (vitest) (windows-latest)	1m 1s
API integration tests + coverage (macos-latest)	18s
API integration tests + coverage (windows-latest)	1m 38s
pytest (ubuntu-latest)	40s
ruff + pip-audit (windows-latest)	54s
Frontend unit tests (vitest) (ubuntu-latest)	20s
	9m 22s

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