Revert "feat(settings): add auto-launch on system startup feature"

This reverts commit ba336fc416.

Reason: Found issues that need to be addressed before reintroducing
the auto-launch feature. Will reimplement with fixes.

src/components/settings/WindowSettings.tsx

@@ -19,13 +19,6 @@ export function WindowSettings({ settings, onChange }: WindowSettingsProps) {
         </p>
       </header>
 
-      <ToggleRow
-        title={t("settings.launchOnStartup")}
-        description={t("settings.launchOnStartupDescription")}
-        checked={!!settings.launchOnStartup}
-        onCheckedChange={(value) => onChange({ launchOnStartup: value })}
-      />
-
       <ToggleRow
         title={t("settings.minimizeToTray")}
         description={t("settings.minimizeToTrayDescription")}