Added settings for misc. & tools preferences with fullscreen option

src/stores/misc-preferences.js

@@ -0,0 +1,14 @@
+import {writable} from "svelte/store";
+import MiscSettings from "$lib/extension/settings/MiscSettings.js";
+
+export const fullScreenViewerEnabled = writable(false);
+
+const miscSettings = new MiscSettings();
+
+Promise.allSettled([
+  miscSettings.resolveFullscreenViewerEnabled().then(v => fullScreenViewerEnabled.set(v))
+]).then(() => {
+  fullScreenViewerEnabled.subscribe(value => {
+    void miscSettings.setFullscreenViewerEnabled(value);
+  })
+});