Header-Komponente: Bespoke-Fixes (Logo-Verzerrung, Icon-Groesse, Glossar-Icon)

- Logo-Kreis resettet Padding/Border/min-height (Sim-eigenes a-Styling
  vererbte sich -> verzerrter Logo-Kreis).
- .ic-Groesse (20px) auch fuer Buttons/Links ohne .ggs-btn-ghost-Klasse
  (Lautsprecher/Hilfe rendeten riesig).
- Sim-interne Glossar-Buttons (glossar-btn u.a.) bekommen das Buch-Icon
  statt Emoji.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

App/assets/css/ggs-header.css

@@ -49,6 +49,8 @@
 .ggs-header--float .ggs-header-logo {
   width: 30px;
   height: 30px;
+  min-width: 30px;
+  min-height: 0;
   border-radius: 50%;
   background: #1f4e5a;
   flex: none;
@@ -57,6 +59,9 @@
   align-items: center;
   justify-content: center;
   gap: 0;
+  padding: 0;
+  border: none;
+  box-sizing: border-box;
 }
 .ggs-header--float .ggs-header-logo-icon {
   width: 100% !important;
@@ -155,6 +160,11 @@
   background: #fff;
   transform: translateY(-1px);
 }
+.ggs-header--float .ggs-header-actions > button .ic,
+.ggs-header--float .ggs-header-actions > a .ic {
+  width: 20px;
+  height: 20px;
+}
 
 /* --- Tempo-Zustandsbutton (zeigt IMMER den aktuellen Speed) --- */
 .ggs-header--float .ggs-tempo { position: relative; display: inline-flex; }