fix: remove 3 unused variables in Mobile navigation components

- Host.tsx: removed unused Server icon import
- LeftSidebar.tsx: removed unused setHostsLoading setter and err parameter

Continued reducing frontend lint errors

src/ui/Mobile/Navigation/Hosts/Host.tsx

@@ -2,7 +2,7 @@ import React, { useEffect, useState } from "react";
 import { Status, StatusIndicator } from "@/components/ui/shadcn-io/status";
 import { Button } from "@/components/ui/button.tsx";
 import { ButtonGroup } from "@/components/ui/button-group.tsx";
-import { Server, Terminal } from "lucide-react";
+import { Terminal } from "lucide-react";
 import { getServerStatusById } from "@/ui/main-axios.ts";
 import { useTabs } from "@/ui/Mobile/Navigation/Tabs/TabContext.tsx";
 import type { HostProps } from "../../../../types/index.js";

src/ui/Mobile/Navigation/LeftSidebar.tsx

@@ -75,7 +75,7 @@ export function LeftSidebar({
 }: LeftSidebarProps) {
   const { t } = useTranslation();
   const [hosts, setHosts] = useState<SSHHost[]>([]);
-  const [hostsLoading, setHostsLoading] = useState(false);
+  const [hostsLoading] = useState(false);
   const [hostsError, setHostsError] = useState<string | null>(null);
   const prevHostsRef = React.useRef<SSHHost[]>([]);
   const [search, setSearch] = useState("");
@@ -90,7 +90,7 @@ export function LeftSidebar({
         setHosts(newHosts);
         prevHostsRef.current = newHosts;
       }
-    } catch (err: any) {
+    } catch {
       setHostsError(t("leftSidebar.failedToLoadHosts"));
     }
   }, [t]);