FSHSP-229 chore(release): bump ui-kit to 0.12.1

[robinlopez]

Jira: FSHSP-229. Release notes: v0.12.1.

• projects/ui-kit/package.json 0.12.0 → 0.12.1 (root package.json untouched).
• CHANGELOG [0.12.1] - 2026-09-25, PATCH: schematics fixes only, options unchanged (FSHSP-228, FSHSP-228 fix(schematics): refuse another Angular major, keep project versions, handle inline type imports #162):
  • ng add / add / update refuse another Angular major before writing anything; project versions are no longer rewritten.
  • Copying ui-input-date no longer fails on type UiIconSize (broken since 0.11.0).
• MCP manifest refreshed after the bump (gitignored, rebuilt by verify): the server announces 0.12.1.

Test plan

• node scripts/changelog.section.mjs 0.12.1, pnpm docs:config:check, Prettier
• Local replay of the verify job: ui-kit:build, MCP embed, schematics:build, schematics:test (99), parity 0.12.1 / 0.12.1, npm publish --dry-run for both packages
• After merge: publish workflow with dry_run: true
• dry_run: false, approved on the npm-publish environment

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