cleanup: ungenutzte CSS-Klassen entfernt, sp-loading restyled

- .font-sm und .semi-transparent Utility-Klassen entfernt (nirgends verwendet)
- .sp-loading: code-Block mit eigenem Styling statt opacity
- modals.js: font-sm/semi-transparent Klassen aus Remote-Modal entfernt

wwwroot/css/chat.css

@@ -870,8 +870,15 @@
 
 .sp-loading {
   text-align: center;
-  opacity: var(--semi-transparent);
-  padding: 2em;
+  padding: var(--page-padding);
+}
+
+.sp-loading code {
+  display: inline-block;
+  background-color: var(--f3-bg);
+  border: 1px solid var(--f3-border);
+  border-radius: var(--border-radius);
+  padding: var(--badge-padding);
 }
 
 /* Payload Preview Modal */

wwwroot/css/form.css

@@ -877,8 +877,6 @@ a.admin-user-meta {
 .mr-badge { margin-right: var(--badge-spacing) }
 .ml-sm { margin-left: 8px }
 .mt-xs { margin-top: 4px }
-.font-sm { font-size: var(--font-size) }
-.semi-transparent { opacity: var(--semi-transparent) }
 .lh-relaxed { line-height: 1.7 }
 
 .scan-status { font-size: .85em; color: var(--text-secondary); padding: 0 0 .5rem 0 }