feat: update sidebar to svelte-5

app/src/lib/sidebar/PanelState.svelte.ts

@@ -0,0 +1,35 @@
+import { localState } from "$lib/helpers/localState.svelte";
+
+type Panel = {
+  icon: string;
+  classes: string;
+  hidden?: boolean;
+}
+
+export class PanelState {
+
+  panels = $state<Record<string, Panel>>({});
+  activePanel = localState<string | boolean>("node.activePanel", "")
+
+  get keys() {
+    return Object.keys(this.panels);
+  }
+
+  public registerPanel(id: string, icon: string, classes: string, hidden: boolean): Panel {
+    const state = $state({
+      icon: icon,
+      classes: classes,
+      hidden: hidden,
+    });
+    this.panels[id] = state;
+    return state;
+  }
+
+  public toggleOpen() {
+    if (this.activePanel.value) {
+      this.activePanel.value = false;
+    } else {
+      this.activePanel.value = this.keys[0]
+    }
+  }
+}