feat(screenshot): report theme changes instead of writing them back #5680

Job	Run time
Detect relevant changes	7s
Docs Size Check	6s
Docker & Add-on Validation	1m 6s
Unit Tests	3m 54s
Component Version Gate	7s
Ruff Lint	26s
Check uv.lock	10s
Site (astro check + eslint a11y)	37s
Mypy Type Check	35s
AST Lint	16s
E2E Validation (ubuntu-latest)	5m 22s
E2E Validation (update path)	3m 30s
E2E Validation (ubuntu-24.04-arm)	4m 44s
E2E Validation (embedded, ubuntu-latest)	6m 19s
E2E Validation (embedded, ubuntu-24.04-arm)	5m 5s
E2E Validation Gate	3s
	32m 27s

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