feat: drop node on edge

Closes #13

app/src/lib/graph-interface/debug/Debug.svelte

@@ -1,19 +1,44 @@
 <script lang="ts">
-	import { MeshLineGeometry, MeshLineMaterial } from '@threlte/extras';
-	import { points, lines } from './store.js';
-	import { T } from '@threlte/core';
+  import { MeshLineGeometry, MeshLineMaterial } from "@threlte/extras";
+  import { points, lines, rects } from "./store.js";
+  import { T } from "@threlte/core";
+  import { Color } from "three";
 </script>
 
 {#each $points as point}
-	<T.Mesh position.x={point.x} position.y={point.y} position.z={point.z} rotation.x={-Math.PI / 2}>
-		<T.CircleGeometry args={[0.2, 32]} />
-		<T.MeshBasicMaterial color="red" />
-	</T.Mesh>
+  <T.Mesh
+    position.x={point.x}
+    position.y={point.y}
+    position.z={point.z}
+    rotation.x={-Math.PI / 2}
+  >
+    <T.CircleGeometry args={[0.2, 32]} />
+    <T.MeshBasicMaterial color="red" />
+  </T.Mesh>
+{/each}
+
+{#each $rects as rect, i}
+  <T.Mesh
+    position.x={(rect.minX + rect.maxX) / 2}
+    position.y={0}
+    position.z={(rect.minY + rect.maxY) / 2}
+    rotation.x={-Math.PI / 2}
+  >
+    <T.PlaneGeometry args={[rect.maxX - rect.minX, rect.maxY - rect.minY]} />
+    <T.MeshBasicMaterial
+      color={new Color().setHSL((i * 1.77) % 1, 1, 0.5)}
+      opacity={0.9}
+    />
+  </T.Mesh>
 {/each}
 
 {#each $lines as line}
-	<T.Mesh>
-		<MeshLineGeometry points={line} />
-		<MeshLineMaterial color="red" linewidth={1} attenuate={false} />
-	</T.Mesh>
+  <T.Mesh position.y={1}>
+    <MeshLineGeometry points={line.points} />
+    <MeshLineMaterial
+      color={line.color || "red"}
+      linewidth={1}
+      attenuate={false}
+    />
+  </T.Mesh>
 {/each}