Generate TypeScript types from CND definitions

[romain-pm]

Part of EPIC #698.

Component props interfaces are maintained by hand next to the CND definition, and drift silently:

[hellojahia:blogPost] > jnt:content, mix:title, jmix:mainResource
 - body (string, richtext) mandatory
 - publicationDate (date)
 - category (string, choicelist[blogCategories])

interface Props {
  "jcr:title": string;      // hand-written mirror of the CND
  "body": string;
  "publicationDate"?: string;
  "category"?: string;
}

Renaming or retyping a CND property breaks nothing at build time — views keep compiling against the stale interface. By contrast, Astro derives content types from the zod schema: change the schema, every consumer re-type-checks on save.

Proposal: a build step (vite plugin or codegen script) that parses the module's .cnd files and emits props interfaces (mandatory vs optional, i18n, multiple, date/weakreference mappings, mixin inheritance), e.g. into a generated .d.ts importable as jahia:types/hellojahia:blogPost or similar. Fold Content Editor form types in later if useful.