fix: add explicit permissions to GitHub Actions workflows

Co-authored-by: benkutil <228373+benkutil@users.noreply.github.com>

Author: Copilot

.github/workflows/accessibility.yml

@@ -10,6 +10,8 @@ jobs:
   accessibility:
     name: Accessibility Testing
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     steps:
       - name: Checkout code

.github/workflows/quality.yml

@@ -10,6 +10,8 @@ jobs:
   quality:
     name: Linting and Build
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
 
     steps:
       - name: Checkout code