Refactor to consistent verification across all platforms

Previously each OS had different verification approaches:
- Windows: PowerShell Get-Command check (failed due to PATH timing)
- Linux/macOS: No verification

Now all platforms use a single bash verification step that runs
after installation. This works because GITHUB_PATH updates take
effect in subsequent steps, not within the same step.

Author: cderv

setup/action.yml

@@ -77,7 +77,7 @@ runs:
       run: |
         # Install quarto
         [ ${{ runner.os }} != "Windows" ] && installer=${{ steps.download-quarto.outputs.installer }}
-        case $RUNNER_OS in 
+        case $RUNNER_OS in
           "Linux")
               sudo apt -y install ./$installer
               ;;
@@ -92,24 +92,24 @@ runs:
               else
                 powershell -File $GITHUB_ACTION_PATH/install-quarto-windows.ps1 ${{ inputs.version }}
               fi
-
-              # Check if installation succeeded
-              if [ $? -ne 0 ]; then
-                  echo "ERROR: Quarto installation failed"
-                  exit 1
-              fi
-
-              echo "Quarto Installed !"
               ;;
             *)
               echo "$RUNNER_OS not supported"
               exit 1
               ;;
         esac
         [ ${{ runner.os }} != "Windows" ] && rm $installer
-        [ ${{ runner.os }} != "Windows" ] && echo "Quarto Installed !"
       shell: bash
       working-directory: ${{ runner.temp }}
+    - name: 'Verify Quarto installation'
+      run: |
+        if ! command -v quarto &> /dev/null; then
+            echo "ERROR: Quarto installation completed but quarto command not found"
+            exit 1
+        fi
+        echo "Quarto Installed !"
+        quarto --version
+      shell: bash
     - name: 'Install TinyTeX'
       env:
         QUARTO_PRINT_STACK: true

setup/install-quarto-windows.ps1

@@ -59,11 +59,4 @@ if ([string]::IsNullOrEmpty($version)) {
     }
 }
 
-# Verify Quarto is available
-$quartoPath = Get-Command quarto -ErrorAction SilentlyContinue
-if (-not $quartoPath) {
-    Write-Error "Quarto installation completed but quarto command not found in PATH"
-    exit 1
-}
-
 exit 0