refactor(scripts): single-process wrapper generation

[rkaraivanov]

The four build-* scripts each spawned npm + tsx and built a TypeScript program over all of src/**, re-parsing the wrappers the previous step had just written. They are configs now; generate.ts runs them together and resolves every type entry in one program. ~10s -> ~2.5s, byte-identical output.

• remove the undeclared glob import and unused rimraf
• type-check scripts/ for the first time (typecheck:scripts)
• add check:manifests: published ranges must admit installed versions
• read custom-elements.json rather than import it; tsc was inferring a literal type for 4.5MB of JSON nothing used (typecheck 3.9s -> 1.5s)
• warn on config tags matching no declaration; drop two stale ignores
• stop mutating the shared manifest in createEvents/parseElementsJSON
• resolve template config into one predicate, dropping the igc-chat branch
• CI: static gates before the build in both pipelines; cache Playwright
• rename build-* npm scripts to generate:*
• update igniteui-webcomponents to 7.3.1, grid-lite to 0.10.0

Additional information (check all that apply):

• Bug fix
• New functionality
• CI/CD

Checklist:

• All relevant tags have been applied to this PR

[github-code-quality]

Code Coverage Overview

Languages: TypeScript

TypeScript / React Wrappers

The overall line coverage in commit 55c715c in the rkaraivanov/prepare-... branch remains at 97%, unchanged from commit ade3a64 in the master branch.