Adopt Bun runtime across build pipelines

.github/workflows/ci-cd-web-desktop.yml

@@ -80,6 +80,9 @@ jobs:
           node-version: 20
           cache: 'pnpm'
 
+      - name: Verify Bun runtime
+        run: bun --version
+
       - name: Permissions diagnostic (server paths)
         run: |
           set +e
@@ -189,7 +192,7 @@ jobs:
           corepack enable || true
           pnpm --filter web install --no-frozen-lockfile
           pnpm prisma:generate
-          pnpm build
+          pnpm build:bun
 
       - name: Publish build to stable APP_DIR directory
         run: |