chore(atomic): remove legacy-template-system.css

[y-lakhdar]

Summary

Removes legacy-template-system.css (KIT-5571) by migrating its last three consumers — Insight results, Recommendation results, and the result placeholder — onto the sanitized template-system.css, then deletes the legacy stylesheet and its now-orphaned imports.

What it does

• The sanitized template system lays sections out via layout classes on each atomic-result-section-* element itself (sections style their own host), whereas the legacy stylesheet positioned sections with descendant-combinator selectors from .result-root. Search and Commerce already work this way because their layout-controller elementPrefix matches their section tags.
• Insight and Recommendation reuse the shared atomic-result-section-* tags, whose names don't match their prefixes, so their sections were never classed. ItemLayoutController now always applies layout classes to shared item-section elements (regardless of prefix or classesOnly); prefixed children keep their previous behavior. This is idempotent for Search/Commerce.
• The result placeholder renders its sections directly (no layout controller), so it now applies the same layout classes to each section element.
• Scoped the Insight .with-sections container/hover/first-of-type rules to .result-root so they no longer leak onto the newly-classed section elements.
• Deletes legacy-template-system.css and its imports (with-sections, row-desktop, row-mobile, cell-desktop, cell-mobile). atomic-children.css is intentionally kept — it is still used by sections/section-children.css.

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commit: da975e4

[chromatic-com]

Tip

All tests passed and all changes approved!

🟢 UI Tests: 465 tests unchanged
🟢 UI Review: 465 stories published -- no changes
Storybook Publish: 465 stories published

[changeset-bot]

🦋 Changeset detected

Latest commit: da975e4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@coveo/atomic	Patch
@coveo/atomic-react	Patch
@coveo/atomic-angular	Patch
@coveo/ui-kit-sample-atomic-commerce-vite	Patch
@coveo/ui-kit-sample-atomic-search-vite	Patch
@coveo/ui-kit-sample-atomic-commerce-react	Patch
@coveo/ui-kit-sample-atomic-search-react	Patch

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