refactor: separate wait step from PR comment step

.github/workflows/docs-pr-preview.yml

@@ -70,24 +70,30 @@ jobs:
           target: pr/${{ github.event.number }}
           commit-message: "Deploy PR #${{ github.event.number }} preview"
 
-      - name: Post or update PR comment
+      - name: Wait for deployment
+        id: wait
         uses: actions/github-script@v7
         with:
           script: |
             const url = '${{ steps.deploy.outputs.url }}';
-
-            // Wait for deployment to be live (poll every 10s, up to 5 min)
-            let live = false;
-            for (let i = 0; i < 30; i++) {
+            const maxAttempts = 30;
+            const intervalMs = 10_000;
+            for (let i = 0; i < maxAttempts; i++) {
               try {
                 const res = await fetch(url);
-                if (res.ok) { live = true; break; }
+                if (res.ok) { core.setOutput('live', 'true'); return; }
               } catch (e) {}
-              await new Promise(r => setTimeout(r, 10000));
+              await new Promise(r => setTimeout(r, intervalMs));
             }
+            core.setOutput('live', 'false');
 
+      - name: Post or update PR comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const url = '${{ steps.deploy.outputs.url }}';
             const marker = '<!-- docs-preview -->';
-            const status = live ? '' : '\n\n> **Note:** The preview may not be ready yet.';
+            const status = '${{ steps.wait.outputs.live }}' === 'true' ? '' : '\n\n> **Note:** The preview may not be ready yet.';
             const body = `${marker}\n📖 Docs preview: ${url}${status}`;
             const { data: comments } = await github.rest.issues.listComments({
               owner: context.repo.owner,