fix: use $.CSRFField in dashboard template range loop (closes #146)

Inside the {{range .AppStats}} block, the dot context is *AppStats,
not the root template data. Use $ to access the root-level CSRFField
added by addGlobals.

templates/dashboard.html

@@ -69,7 +69,7 @@
                             <a href="/apps/{{.App.ID}}" class="btn-text text-sm py-1 px-2">View</a>
                             <a href="/apps/{{.App.ID}}/edit" class="btn-secondary text-sm py-1 px-2">Edit</a>
                             <form method="POST" action="/apps/{{.App.ID}}/deploy" class="inline">
-                {{ .CSRFField }}
+                {{ $.CSRFField }}
                                 <button type="submit" class="btn-success text-sm py-1 px-2">Deploy</button>
                             </form>
                         </div>