fix(ci): bootstrap pnpm before setup-node in electron workflow (#1524)

setup-node@v4 with cache: pnpm needs pnpm on PATH before it runs, but
the workflow had it in the wrong order so the build failed on the first
push to dev after the electron shell landed. Matches the bootstrap
sequence already used in build-desktop.yml: pnpm first, then
setup-node@v6 using node-version-file: .nvmrc instead of a hardcoded
version.

Co-authored-by: Benjamin Shafii <benjamin@openworklabs.com>

.github/workflows/build-electron-desktop.yml

@@ -32,17 +32,19 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22
-          cache: pnpm
-
+      # pnpm must be installed BEFORE setup-node so setup-node can find the
+      # pnpm binary on PATH. Matches the pattern in build-desktop.yml so
+      # the two workflows share the same bootstrap story.
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
         with:
           version: 10.27.0
 
+      - name: Setup Node
+        uses: actions/setup-node@v6
+        with:
+          node-version-file: .nvmrc
+
       - name: Setup Bun
         uses: oven-sh/setup-bun@v2
         with:
@@ -51,7 +53,7 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
-      - name: Package Electron desktop
+      - name: Package Electron desktop (unpacked)
         run: pnpm --filter @openwork/desktop package:electron:dir
 
       - name: Upload Electron artifacts