fix(ci): install pnpm without corepack in the browser jobs

.github/workflows/ci.yml

@@ -108,10 +108,12 @@ jobs:
       HOME: /root
     steps:
       - uses: actions/checkout@v7
-      - name: enable pnpm
-        run: |
-          corepack enable
-          corepack prepare pnpm@11.1.3 --activate
+      - name: install pnpm
+        # Not corepack, unlike the other jobs: the image re-published under this tag
+        # carries Node 26, which no longer bundles corepack ("corepack: not found"),
+        # and `npm install -g corepack` collides with the image's own yarn binaries.
+        # The other jobs run setup-node 22, which still has it. Same pinned version.
+        run: npm install -g pnpm@11.1.3
       - run: pnpm install --frozen-lockfile
       - run: pnpm test:browser
 

.github/workflows/release.yml

@@ -127,10 +127,9 @@ jobs:
       HOME: /root
     steps:
       - uses: actions/checkout@v7
-      - name: enable pnpm
-        run: |
-          corepack enable
-          corepack prepare pnpm@11.1.3 --activate
+      - name: install pnpm
+        # See the same step in ci.yml: this image's Node no longer bundles corepack.
+        run: npm install -g pnpm@11.1.3
       - run: pnpm install --frozen-lockfile
       - run: pnpm test:browser