Scrape UX: auto-detect first + visual item cards + selectors behind Edit

[nmbrthirteen]

Makes setting up a Website source mostly "paste URL → click one button → see what'll be scraped", instead of writing CSS by hand.

• Detect content row is now the primary action. Auto-detect fields runs AI detection and then immediately previews.
• Visual preview: each detected item renders as a card (image thumbnail, bold title, labelled fields) so you see the content that will be imported.
• The CSS selectors (item selector, fields table, next-page) are hidden behind an Edit selectors toggle — available for tweaking, out of the way by default.

No behavior change to scraping itself; the selectors still drive it (auto-filled by detection). 86 tests green, lint clean.

[coderabbitai]

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 67be6c6d-fd88-4f1e-ad16-cc8a3457c893

📥 Commits

Reviewing files that changed from the base of the PR and between f3cefe1 and 38d9fb5.

📒 Files selected for processing (2)

• assets/css/admin.css
• src/Admin/views/sources.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/scrape-visual-detect

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