misc: load json files using json modules

resources/browserhtml/homescreen/index.js

···
 // Load widgets from JSON
 async function loadWidgets() {
   try {
-    const response = await fetch("resources/widgets.json");
-    const widgets = await response.json();
+    const { default: widgets } = await import("./resources/widgets.json", {
+      with: { type: "json" },
+    });
     renderWidgets(widgets);
   } catch (e) {
     console.log("[Homescreen] No widgets configured");
···
 // Load bookmarks from JSON
 async function loadBookmarks() {
   try {
-    const response = await fetch("resources/bookmarks.json");
-    const bookmarks = await response.json();
+    const { default: bookmarks } = await import("./resources/bookmarks.json", {
+      with: { type: "json" },
+    });
     renderBookmarks(bookmarks);
   } catch (e) {
     console.error("[Homescreen] Failed to load bookmarks:", e);

resources/browserhtml/shared/search/engines.js

···
 
 const PREF_NAME = "browserhtml.search_engine";
 
+// Load the default search engines resource.
+import ENGINES from "//shared.localhost:8888/search/default_engines.json" with { type: "json" };
+
 export default class SearchEngines extends EventTarget {
   constructor() {
     super();
-    this.engines = null;
     this.currentEngine = null;
+    this.engines = ENGINES;
   }
 
   async ensureReady() {
     if (this.currentEngine) {
-      return;
-    }
-
-    // Load the default search engines resource.
-    try {
-      let response = await fetch(
-        "//shared.localhost:8888/search/default_engines.json",
-      );
-      this.engines = await response.json();
-    } catch (e) {
-      console.error(`Failed to load search engines: ${e}`);
       return;
     }