feat: migrate most of graph-manager to svelte-5

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

@@ -0,0 +1,27 @@
+import type { Socket } from "@nodes/types";
+import { getContext } from "svelte";
+
+export function getGraphState() {
+  return getContext<GraphState>("graphState");
+}
+
+export class GraphState {
+
+  activeNodeId = $state(-1);
+
+  selectedNodes = $state(new Set<number>());
+  clearSelection() {
+    this.selectedNodes = new Set();
+  }
+
+  activeSocket = $state<Socket | null>(null);
+  hoveredSocket = $state<Socket | null>(null);
+  possibleSockets = $state<Socket[]>([]);
+  possibleSocketIds = $derived(new Set(
+    this.possibleSockets.map((s) => `${s.node.id}-${s.index}`),
+  ));
+
+}
+
+export { colors } from "./colors";
+