Fix: Install Cypress binary in CI workflow

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Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: kylemclaren

.github/workflows/fly-preview.yml

@@ -96,6 +96,9 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
+      - name: Install Cypress binary
+        run: pnpm cypress install
+
       - name: Wait for preview to be ready
         run: |
           echo "Waiting for preview deployment to be ready..."