refactor: update UI components and styles for improved consistency and functionality

- Refactored Skeleton component to include data-slot attribute and updated class names.
- Enhanced Switch component with size prop and improved styling.
- Updated Tooltip components to include data-slot attributes and improved styling.
- Refactored global CSS to use custom properties for theming and improved dark mode support.
- Added useIsMobile hook for responsive design handling.
- Updated IPC link implementation for tRPC in Electron.
- Adjusted ProjectsPage layout for better responsiveness.
- Removed outdated Tailwind configuration file and integrated Tailwind CSS with Vite.

src/preload/index.ts

@@ -1,7 +1,3 @@
 // See the Electron documentation for details on how to use preload scripts:
 // https://www.electronjs.org/docs/latest/tutorial/process-model#preload-scripts
-import { exposeElectronTRPC } from 'electron-trpc/main';
-
-process.once('loaded', () => {
-  exposeElectronTRPC();
-});
+import './trpc';

src/preload/trpc.ts

@@ -0,0 +1,20 @@
+/**
+ * Preload script — expose a minimal IPC transport to the renderer.
+ *
+ * Replaces electron-trpc's exposeElectronTRPC with a compatible shim
+ * that works with our custom IPC handler + tRPC v11.
+ */
+import { contextBridge, ipcRenderer } from 'electron';
+
+const IPC_CHANNEL = 'trpc';
+
+contextBridge.exposeInMainWorld('electronTRPC', {
+  sendMessage: (msg: unknown) => ipcRenderer.send(IPC_CHANNEL, msg),
+  onMessage: (cb: (data: unknown) => void) => {
+    const handler = (_event: Electron.IpcRendererEvent, data: unknown) => cb(data);
+    ipcRenderer.on(IPC_CHANNEL, handler);
+    return () => {
+      ipcRenderer.removeListener(IPC_CHANNEL, handler);
+    };
+  },
+});