Session list performance: disk summary cache, display-name cache, and count alignment #245

Job	Run time
ruff + pip-audit (macos-latest)	22s
Performance benchmarks (gated)	33s
Verify prod requirements.txt is sufficient	10s
mypy	18s
API integration tests + coverage (ubuntu-latest)	19s
ruff + pip-audit (windows-latest)	1m 40s
ruff + pip-audit (ubuntu-latest)	21s
API integration tests + coverage (macos-latest)	19s
pytest (macos-latest)	31s
API integration tests + coverage (windows-latest)	2m 27s
pytest (ubuntu-latest)	43s
pytest (windows-latest)	1m 8s
Frontend unit tests (vitest) (ubuntu-latest)	20s
Frontend unit tests (vitest) (macos-latest)	31s
Frontend unit tests (vitest) (windows-latest)	50s
	10m 32s

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