fix: add typecheck and validate scripts to package.json for CI and local validation

[sojetunde8]

Closes #567

Summary

• Updated typecheck, typecheck:watch, and type-check scripts in package.json to use tsc -b --noEmit (project references mode), matching the root tsconfig.json which uses "references" array
• Added a combined validate script (npm run typecheck && npm run lint) for fast local preflight checks before pushing
• Updated .github/workflows/test.yml to run npm run validate instead of separate lint and typecheck steps, reducing CI step count while keeping the same coverage

Scope

Does not fix existing type errors surfaced by the typecheck (e.g. _params: any cast in main.tsx, loose status: string in client interfaces). Those are pre-existing and out of scope for this issue.

Testing

• Verified the diff is minimal (2 files changed, 6 insertions, 8 deletions)
• npm run typecheck runs tsc -b --noEmit and correctly uses project references
• npm run validate runs typecheck then lint in sequence
• CI workflow updated to use the single validate command

Files changed

• package.json — Added -b flag to typecheck scripts for project references; added validate script
• .github/workflows/test.yml — Consolidated lint + typecheck steps into single validate step

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