feat: add header element

app/src/lib/graph-interface/graph/Graph.svelte

@@ -105,7 +105,7 @@
   onwheel={(ev) => mouseEvents.handleMouseScroll(ev)}
   bind:this={graphState.wrapper}
   class="graph-wrapper"
-  style="height: 100vh;"
+  style="height: 100%;"
   class:is-panning={graphState.isPanning}
   class:is-hovering={graphState.hoveredNodeId !== -1}
   aria-label="Graph"

app/src/lib/result-viewer/Viewer.svelte

@@ -95,7 +95,7 @@
   <SmallPerformanceViewer {fps} store={perf} />
 {/if}
 
-<div style="height: 100vh">
+<div style="height: 100%">
   <Canvas>
     <Scene
       bind:this={sceneComponent}

app/src/routes/+page.svelte

@@ -172,7 +172,7 @@
 <svelte:document onkeydown={applicationKeymap.handleKeyboardEvent} />
 
 <div class="wrapper manager-{manager?.status}">
-  <header></header>
+  <header class="h-[40px] border-b-1 border-[var(--outline)]"></header>
   <Grid.Row>
     <Grid.Cell>
       <Viewer
@@ -285,7 +285,7 @@
     width: 100vw;
     color: white;
     display: grid;
-    grid-template-rows: 0px 1fr;
+    grid-template-rows: 40px 1fr;
   }
 
   .wrapper :global(canvas) {