fix(screenshot): re-arm the theme guard for themed captures only #5652

Job	Run time
Site (astro check + eslint a11y)	26s
Mypy Type Check	31s
Component Version Gate	6s
Docker & Add-on Validation	1m 15s
Check uv.lock	14s
Detect relevant changes	6s
AST Lint	22s
Docs Size Check	5s
Ruff Lint	23s
Unit Tests	4m 6s
E2E Validation (update path)	3m 31s
E2E Validation (embedded, ubuntu-24.04-arm)	4m 52s
E2E Validation (ubuntu-24.04-arm)	4m 18s
E2E Validation (ubuntu-latest)	5m 51s
E2E Validation (embedded, ubuntu-latest)	6m 4s
E2E Validation Gate	3s
	32m 13s

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