feat: add general assist feature and enhance shortcut management

- Introduced a new "General Assist" shortcut, allowing users to open SurfSense from anywhere.
- Updated shortcut management to include the new general assist functionality in both the desktop and web applications.
- Enhanced the UI to reflect changes in shortcut labels and descriptions for better clarity.
- Improved the Electron API to support the new shortcut configuration.

surfsense_web/components/desktop/shortcut-recorder.tsx

@@ -36,6 +36,7 @@ export function acceleratorToDisplay(accel: string): string[] {
 }
 
 export const DEFAULT_SHORTCUTS = {
+	generalAssist: "CommandOrControl+Shift+S",
 	quickAsk: "CommandOrControl+Alt+S",
 	autocomplete: "CommandOrControl+Shift+Space",
 };