Prepare semantic feedback motion 1.7.0

[Foscat]

Summary

• Add CSS-only semantic feedback motion for error, success, and attention states.
• Prepare the 1.7.0 release candidate docs, manifest, package metadata, and demo.
• Repair release fixture drift with clean reviewed UI/Layout checkouts and a candidate-version overlay.

Verification

• npm.cmd run validate:full
• npm.cmd run release:verify
• npm.cmd run audit
• npx.cmd playwright test --config=./playwright.config.mjs --reporter=dot