fix(e2e/varlet): install pnpm globally via vp i -g pnpm

Previous fix replaced bootstrap.mjs with explicit vp run commands,
but that was unnecessarily complex. Simpler: let `vp i -g pnpm`
install pnpm into ~/.vite-plus/bin so scripts/bootstrap.mjs (which
spawns `pnpm build` via tinyexec) can resolve it.

Author: fengmk2

.github/workflows/e2e-test.yml

@@ -317,16 +317,10 @@ jobs:
           - name: varlet
             node-version: 22
             command: |
-              # Replace `node scripts/bootstrap.mjs`, which spawns `pnpm build` via
-              # tinyexec and cannot find pnpm on the CI runner (ENOENT). Run each
-              # package's build through vp instead, which uses its bundled runtime.
-              # Skip `-r` to avoid the @varlet/cli <-> @varlet/ui devDependency cycle.
-              vp run -F '@varlet/shared' -F '@varlet/touch-emulator' -F '@varlet/preset-unocss' -F '@varlet/preset-tailwindcss' -F '@varlet/import-resolver' -F '@varlet/use' -F '@varlet/vite-plugins' build
-              # tsc reports type errors against @varlet/ui (which isn't compiled yet)
-              # but still emits JS output — matches upstream bootstrap behavior.
-              vp run @varlet/cli#build || true
-              vp run @varlet/icons#build
-              vp run @varlet/ui#compile
+              # scripts/bootstrap.mjs spawns `pnpm build` via tinyexec and needs
+              # pnpm on PATH (not exposed by the vp install itself).
+              vp i -g pnpm
+              node scripts/bootstrap.mjs
               vp run lint
               vp run test:coverage
         exclude: