Migrate the whole test suite to Vitest browser mode and delete Cypress tests

.github/workflows/pr-validation.yml

@@ -22,23 +22,7 @@ jobs:
       - name: Lint code
         run: pnpm run lint:changes
   vitest-tests:
-    name: Vitest unit tests
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: pnpm/action-setup@v6
-      - uses: actions/setup-node@v6
-        with:
-          node-version: '24'
-          cache: 'pnpm'
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
-      - name: Bootstrap project
-        run: pnpm run bootstrap
-      - name: Run vitest unit tests
-        run: pnpm run test:vitest
-  vitest-browser-tests:
-    name: Vitest browser tests
+    name: Vitest tests
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
@@ -54,23 +38,5 @@ jobs:
       - name: Bootstrap project
         run: pnpm run bootstrap
       - name: Run vitest browser tests
-        run: pnpm run test:browser
-  cypress:
-    name: Cypress component tests
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: pnpm/action-setup@v6
-      - uses: actions/setup-node@v6
-        with:
-          node-version: '24'
-          cache: 'pnpm'
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
-      - name: Install Cypress binary
-        run: npx cypress install
-      - name: Bootstrap project
-        run: pnpm run bootstrap
-      - name: Run Cypress components tests
-        run: pnpm run cy:component
+        run: pnpm run test:vitest
 

CLAUDE.md

@@ -9,7 +9,6 @@ External docs (preferred over guessing component APIs): https://instructure.desi
 - `pnpm run bootstrap` — required first time and after `pnpm run clean`. Builds icons, compiles, generates tokens. Plain `pnpm install` is **not** enough.
 - `pnpm run dev` — docs app at http://localhost:9090 (hot-reloads component changes).
 - `pnpm run test:vitest <pkg>` — run a single package's unit tests, e.g. `pnpm run test:vitest ui-radio-input`. Without an argument it runs everything (slow).
-- `pnpm run cy:component` — Cypress component tests.
 - Visual regression lives in `/regression-test` (separate Next.js app, port 3000). See `/regression-test/README.md`.
 
 ## Code conventions