Added Focused mode as default. Also finally adding the icons correctly.

bicorder-app/src/components/ExportControls.svelte

@@ -3,6 +3,7 @@
   import type { BicorderState } from '../types';
 
   export let data: BicorderState;
+  export let focusedMode: boolean = false;
 
   const dispatch = createEventDispatcher<{
     reset: void;
@@ -121,7 +122,7 @@
   }
 </script>
 
-<section class="export-controls">
+<section class="export-controls" class:focused={focusedMode}>
   <div class="button-group">
     <button on:click={exportToJSON}>
       💾 Export JSON
@@ -170,6 +171,10 @@
     border-top: 2px solid var(--border-color);
   }
 
+  .export-controls.focused {
+    border-top: none;
+  }
+
   .button-group {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));