fix(ci): remove duplicate preview URL comment step

Azure/static-web-apps-deploy already posts a PR comment when repo_token
is provided. Remove the redundant actions/github-script step.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: chrisjwalk-bot

.github/workflows/preview.yml

@@ -9,9 +9,6 @@ concurrency:
   group: preview-${{ github.event.pull_request.number }}
   cancel-in-progress: true
 
-permissions:
-  pull-requests: write
-
 jobs:
   deploy_preview:
     if: github.event.action != 'closed'
@@ -48,35 +45,6 @@ jobs:
           app_location: dist/apps/web-app/browser
           skip_app_build: true
 
-      - name: Comment preview URL on PR
-        uses: actions/github-script@v7
-        with:
-          script: |
-            const url = '${{ steps.deploy.outputs.static_web_app_url }}';
-            const marker = '<!-- swa-preview-url -->';
-            const body = `${marker}\n🔍 **Preview deployment:** ${url}`;
-            const { data: comments } = await github.rest.issues.listComments({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-            });
-            const existing = comments.find(c => c.body.includes(marker));
-            if (existing) {
-              await github.rest.issues.updateComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                comment_id: existing.id,
-                body,
-              });
-            } else {
-              await github.rest.issues.createComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: context.issue.number,
-                body,
-              });
-            }
-
   close_preview:
     if: github.event.action == 'closed'
     name: Close Preview