Move tree implementation out of collections store (#4763)

* refactor: attaching emoji in tree node is unnecessary

* refactor: pass depth and hasChildren as separate props

* refactor: move tree impl into a separate hook

* refactor: separate out as DocumentExplorer for reuse

* fix: separate search and node

* fix: review comments

* fix: tsc

app/types.ts

@@ -140,14 +140,6 @@ export type FetchOptions = {
   force?: boolean;
 };
 
-export type NavigationNode = {
-  id: string;
-  title: string;
-  url: string;
-  children: NavigationNode[];
-  isDraft?: boolean;
-};
-
 export type CollectionSort = {
   field: string;
   direction: "asc" | "desc";