Add emoji to GitHub Actions step names for consistency

Several workflows were missing the emoji-prefixed step naming used
elsewhere (e.g. nightly-build.yml, build-submit-ios/android.yml), and
a couple of files that already used emoji had a few gaps. Fills those
in across all workflow files. Job-level `name:` fields are left
untouched since some are pinned as required branch-protection check
names.

.github/workflows/claude-mention.yml

@@ -53,18 +53,18 @@ jobs:
       cancel-in-progress: false
 
     steps:
-      - name: Checkout repository
+      - name: ⬇️ Checkout repository
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           fetch-depth: 1
 
-      - name: Configure AWS credentials (OIDC)
+      - name: ☁️ Configure AWS credentials (OIDC)
         uses: aws-actions/configure-aws-credentials@517a711dbcd0e402f90c77e7e2f81e849156e31d # v6.2.2
         with:
           role-to-assume: ${{ secrets.AWS_BEDROCK_REVIEW_ROLE_ARN }}
           aws-region: us-east-2
 
-      - name: Claude
+      - name: 🤖 Claude
         uses: anthropics/claude-code-action@e90deca47693f9457b72f2b53c17d7c445a87342 # v1.0.171
         with:
           use_bedrock: 'true'