Gebruik pnpm i.p.v. npm in README

Het project gebruikt pnpm (pnpm-lock.yaml, CI draait pnpm install
--frozen-lockfile), maar de README-instructies en scripts-tabel
verwezen nog naar npm.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -17,8 +17,8 @@ reference designs in `References/` (`slp-software.html` = purple accent,
 ## Getting Started
 
 ```bash
-npm install
-npm run dev
+pnpm install
+pnpm dev
 ```
 
 The app runs at `http://localhost:5173/` by default.
@@ -27,13 +27,13 @@ The app runs at `http://localhost:5173/` by default.
 
 | Script | Description |
 |---|---|
-| `npm run dev` | Start the Vite dev server |
-| `npm run build` | Type-check and build a production bundle to `dist/` |
-| `npm run preview` | Preview the production build locally |
-| `npm run test` | Run the test suite once (Vitest) |
-| `npm run test:watch` | Run the test suite in watch mode |
-| `npm run lint` | Run ESLint |
-| `npm run format` | Format the codebase with Prettier |
+| `pnpm dev` | Start the Vite dev server |
+| `pnpm build` | Type-check and build a production bundle to `dist/` |
+| `pnpm preview` | Preview the production build locally |
+| `pnpm test` | Run the test suite once (Vitest) |
+| `pnpm test:watch` | Run the test suite in watch mode |
+| `pnpm lint` | Run ESLint |
+| `pnpm format` | Format the codebase with Prettier |
 
 ## Project Structure
 
@@ -62,7 +62,7 @@ for the full theme business rules.
 
 ## Deployment Notes
 
-This app builds to a plain static bundle (`npm run build` → `dist/`), intended for
+This app builds to a plain static bundle (`pnpm build` → `dist/`), intended for
 upload to a traditional web host via FTP. TanStack Router uses hash-based history
 (`/#/route`) so that client-side routing keeps working even on hosts without
 server-side rewrite rules configured. See the feature's NFR Requirements/Design