fix: remove 9 unused variables across multiple files

Files fixed:
- DesktopApp.tsx: Removed _nextView parameter
- TerminalWindow.tsx: Removed minimizeWindow
- Mobile Host.tsx: Removed Server import
- Mobile LeftSidebar.tsx: Removed setHostsLoading, err in catch
- Desktop LeftSidebar.tsx: Removed getCookie, setCookie, onSelectView, getView, setHostsLoading

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui/Desktop/DesktopApp.tsx

@@ -67,7 +67,7 @@ function AppContent() {
     localStorage.setItem("topNavbarOpen", JSON.stringify(isTopbarOpen));
   }, [isTopbarOpen]);
 
-  const handleSelectView = (_nextView: string) => {
+  const handleSelectView = () => {
     // View switching is now handled by tabs context
   };