feat(theme): merge edge and connection color

app/src/lib/graph-interface/edges/Edge.svelte

@@ -2,19 +2,19 @@
   import { colors } from '../graph/colors.svelte';
 
   const circleMaterial = new MeshBasicMaterial({
-    color: colors.edge.clone(),
+    color: colors.connection.clone(),
     toneMapped: false
   });
 
-  let lineColor = $state(colors.edge.clone().convertSRGBToLinear());
+  let lineColor = $state(colors.connection.clone().convertSRGBToLinear());
 
   $effect.root(() => {
     $effect(() => {
       if (appSettings.value.theme === undefined) {
         return;
       }
-      circleMaterial.color = colors.edge.clone().convertSRGBToLinear();
-      lineColor = colors.edge.clone().convertSRGBToLinear();
+      circleMaterial.color = colors.connection.clone().convertSRGBToLinear();
+      lineColor = colors.connection.clone().convertSRGBToLinear();
     });
   });
 

app/src/lib/graph-interface/graph/colors.svelte.ts

@@ -9,7 +9,7 @@ const variables = [
   'outline',
   'active',
   'selected',
-  'edge'
+  'connection'
 ] as const;
 
 function getColor(variable: (typeof variables)[number]) {

app/src/lib/settings/NestedSettings.svelte

@@ -211,7 +211,7 @@
   .first-level.input {
     padding-left: 1em;
     padding-right: 1em;
-    padding-bottom: 1px;
+    padding-bottom: 0.5px;
     gap: 3px;
   }