Added meaningful window titles

frontend/src/lib/stores/windowtitle.js

@@ -0,0 +1,14 @@
+import { WindowSetTitle } from "$wails/runtime/runtime";
+import { writable } from "svelte/store";
+
+const { set, subscribe } = writable('Rolens');
+
+subscribe(newTitle => WindowSetTitle(newTitle));
+
+const windowTitle = {
+  set,
+  setSegments: (...segments) => set(segments.map(s => s.trim()).join(' — ')),
+  subscribe,
+};
+
+export default windowTitle;