Prepare 0.3.0 release

[maotora]

Summary

• Bump reveal-ui to 0.3.0 with a new CHANGELOG.md.
• Refresh root and docs-site dependencies (Biome 2.4.15, Jest 30.4.x, Motion 12.40.0, React 19.2.6, Next.js 15.5.18, tailwind-merge 3.6.0).
• Align the motion peer dependency to ^12.40.0.
• Harden npm publishing for GitHub OIDC trusted publishing (npm whoami preflight, job-level id-token permission).
• Add npm publish --dry-run to CI so tarball issues are caught before tagging.

Test plan

• npm run ci passes locally
• CI workflow passes on this PR
• After merge: tag v0.3.0 on main and confirm Publish workflow succeeds via OIDC
• Verify npm view reveal-ui version reports 0.3.0
• Confirm GitHub Pages deploy still succeeds on main

Release notes

After this PR merges:

1. Merge to main
2. Create and push tag: git tag v0.3.0 && git push origin v0.3.0
3. Watch the Publish workflow — OIDC npm whoami should pass before publish runs

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