fix(screenshot): re-arm the theme guard for themed captures only #5647

Job	Run time
Detect relevant changes	5s
Mypy Type Check	30s
Docs Size Check	6s
AST Lint	14s
Ruff Lint	21s
Site (astro check + eslint a11y)	33s
Component Version Gate	6s
Docker & Add-on Validation	1m 1s
Check uv.lock	13s
Unit Tests	3m 42s
E2E Validation (ubuntu-24.04-arm)	5m 12s
E2E Validation (embedded, ubuntu-24.04-arm)	4m 42s
E2E Validation (embedded, ubuntu-latest)	6m 17s
E2E Validation (update path)	3m 17s
E2E Validation (ubuntu-latest)	5m 47s
E2E Validation Gate	2s
	32m 8s

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