Group Header Rendering Fixes

src/lib/components/tui/TuiHeader.svelte

@@ -1,20 +1,13 @@
 <script lang="ts">
 	import Icon from '@iconify/svelte';
 	import { user } from '$lib/config';
-	import { colorTheme, type ColorTheme } from '$lib/stores/theme';
+	import { colorTheme, getThemeIcon, type ColorTheme } from '$lib/stores/theme';
 	import '$lib/assets/css/tui-header.css';
 
 	export let title = 'terminal';
 	export let interactive = true;
 	export let hasButtons = false;
 
-	function getThemeIcon(theme: ColorTheme): string {
-		switch (theme) {
-			case 'arch': return 'mdi:arch';
-			case 'catppuccin': return 'solar:cat-bold';
-			default: return 'mdi:palette';
-		}
-	}
 </script>
 
 <div class="tui-statusbar top">