Restructure GUI folder & modify styles.css

gui/js/preload.js

@@ -0,0 +1,7 @@
+const { contextBridge, ipcRenderer } = require('electron');
+
+contextBridge.exposeInMainWorld('electronAPI', {
+    sendPrompt: (prompt, model) => ipcRenderer.invoke('send-prompt', { prompt, model }),
+    onApiKeySaved: (callback) => ipcRenderer.on('api-key-saved', callback),
+    abortPrompt: () => ipcRenderer.send('abort-prompt')
+});