Globale .icon-btn Klasse für alle Icon-only Buttons, Hover-Filter, Theme-Anpassungen

wwwroot/css/base.css

@@ -61,6 +61,7 @@ button:not(:disabled) {
 
 button:not(:disabled):hover, select:hover, input:hover, textarea:hover {
   border-color: var(--primary);
+  filter: var(--hover-filter);
 }
 
 button:disabled {
@@ -71,6 +72,20 @@ input {
   min-width: 0;
 }
 
+.icon-btn {
+  width: 2em;
+  aspect-ratio: 1;
+  padding: 0;
+  line-height: 1;
+  overflow: hidden;
+  flex-shrink: 0;
+}
+
+button.icon-btn,
+button.icon-btn:hover {
+  border-color: transparent;
+}
+
 textarea, code, pre, .tool-input, .tool-diff, .tool-result, .fe-line-numbers {
   font-family: var(--mono);
   font-size: var(--mono-size);