fix(ui): harden file viewer runtime #119

Job	Run time
Frontend (lint · typecheck · test · build)	1m 18s
Security · SAST · SBOM	14s
OpenAPI spec validation (§5)	42s
Rust (fmt · clippy · test)	5m 18s
Python (ruff · mypy · pytest)	25s
License compliance (§3)	3m 8s
	11m 5s

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