Add more robust modals controller

src/state/models/shell.ts

@@ -0,0 +1,28 @@
+import {makeAutoObservable} from 'mobx'
+
+export class LinkActionsModel {
+  name = 'link-actions'
+
+  constructor(public href: string, public title: string) {
+    makeAutoObservable(this)
+  }
+}
+
+export class ShellModel {
+  isModalActive = false
+  activeModal: LinkActionsModel | undefined
+
+  constructor() {
+    makeAutoObservable(this)
+  }
+
+  openModal(modal: LinkActionsModel) {
+    this.isModalActive = true
+    this.activeModal = modal
+  }
+
+  closeModal() {
+    this.isModalActive = false
+    this.activeModal = undefined
+  }
+}