make primary file use font style italics (#324)

Co-authored-by: burnettk <burnettk@users.noreply.github.com>

spiffworkflow-frontend/src/index.css

@@ -595,3 +595,7 @@ hr {
     margin: 1rem 0;
     opacity: .25;
 }
+
+.primary-file-text-suffix {
+  font-style: italic;
+}

spiffworkflow-frontend/src/routes/ProcessModelShow.tsx

@@ -352,9 +352,14 @@ export default function ProcessModelShow() {
         );
       }
 
-      let primarySuffix = '';
+      let primarySuffix = null;
       if (isPrimaryBpmnFile) {
-        primarySuffix = '- Primary File';
+        primarySuffix = (
+          <span>
+            &nbsp;-{' '}
+            <span className="primary-file-text-suffix">Primary File</span>
+          </span>
+        );
       }
       let fileLink = null;
       const fileUrl = profileModelFileEditUrl(processModelFile);