Decouple core Yaak logic from Tauri (#354)

crates-tauri/yaak-mac-window/index.ts

@@ -0,0 +1,9 @@
+import { invoke } from '@tauri-apps/api/core';
+
+export function setWindowTitle(title: string) {
+  invoke('plugin:yaak-mac-window|set_title', { title }).catch(console.error);
+}
+
+export function setWindowTheme(bgColor: string) {
+  invoke('plugin:yaak-mac-window|set_theme', { bgColor }).catch(console.error);
+}