added staging banner

internal/view/baseview/layout.templ

@@ -40,6 +40,9 @@ templ Layout(title string) {
 				id="main-content"
 				class="flex flex-col h-screen"
 			>
+				if devInfo.StagingBanner {
+					@stagingBanner()
+				}
 				@Navbar()
 				if previewRole != nil {
 					@previewModeBanner(previewRole)
@@ -57,6 +60,12 @@ templ Layout(title string) {
 	</html>
 }
 
+templ stagingBanner() {
+	<div class="bg-peach text-crust text-center text-xs font-bold py-1 tracking-wider uppercase">
+		Staging Environment - For Testing Only
+	</div>
+}
+
 // Preview mode banner (private helper)
 templ previewModeBanner(previewRole *db.Role) {
 	<div class="bg-yellow/20 border-b border-yellow/40 px-4 py-3">