FSHSP-228 fix(schematics): refuse another Angular major, keep project versions, handle inline type imports

[robinlopez]

Jira: FSHSP-228. Reported after publishing 0.12.0; ships in 0.12.1.

Problems

1. ng add on an Angular 20 project: the kit's peerDependencies (^22.0.0) were copied over the project's versions. core, common, forms, router, platform-browser moved to 22 while compiler-cli, build and cli stayed on 20, and npm stopped on ERESOLVE (@angular-devkit/build-angular@^22 vs @angular/compiler-cli@^20), leaving a half-migrated package.json.
2. Copying ui-input-date failed since 0.11.0: "import(s) du kit non réadressé(s) … (symbole type UiIconSize)". The import rewrite read the inline type modifier (import { UiIcon, type UiIconSize }) as part of the symbol name.
3. Library mode looked fine on Angular 20 because pnpm only warns on unmet peers (npm refuses). Documentation only.

Fix

• ng-add, add and update check the project's Angular major first (utils/angular-version.ts) and stop before writing anything, printing the ng update steps, one major at a time.
• ensureDependency: a declared dependency keeps its range; a missing @angular/* package takes the project's @angular/core range (framework packages peer each other at the exact version).
• symbolName skips the inline type modifier for the lookup; the rewritten import keeps it.
• First schematics tests: pnpm schematics:test (99 tests), run in Lint, types & docs. One renders every kit unit, so an unmapped import fails here instead of at a consumer's install.
• READMEs: Angular 22 prerequisite in the schematics README, pnpm unmet-peer warning in the kit README. CHANGELOG under [Unreleased].

Test plan

• pnpm schematics:test: 99 passed. With the type fix reverted, it fails exactly on ui-input-date (and the symbolName cases)
• Clone of the reporter's Angular 20 project: clear refusal, package.json and angular.json unchanged, no file created
• Fresh Angular 22 app installed with npm: ng-add --skip-components (with install) OK, Angular ranges untouched; add --all then ng build and build-storybook OK
• Fresh Angular 22 app, library mode: npm install @4sh/ui-kit@0.12.0 + ng build OK
• pnpm schematics:build, pnpm docs:config:check, Prettier

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