feat(screenshot): report theme changes instead of writing them back #5695

Job	Run time
Site (astro check + eslint a11y)	34s
Check uv.lock	13s
Docs Size Check	7s
Ruff Lint	22s
Detect relevant changes	8s
Docker & Add-on Validation	1m 8s
Unit Tests	4m 3s
Component Version Gate	6s
AST Lint	18s
Mypy Type Check	35s
E2E Validation (update path)	3m 37s
E2E Validation (embedded, ubuntu-latest)	7m 14s
E2E Validation (ubuntu-24.04-arm)	4m 20s
E2E Validation (ubuntu-latest)	5m 45s
E2E Validation (embedded, ubuntu-24.04-arm)	5m 4s
E2E Validation Gate	2s
	33m 36s

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