fix: remove 8 unused variables in File Manager and Host Manager components

Cleaned up unused imports, state variables, and function parameters:
- DiffViewer.tsx: removed unused error parameter in catch block
- FileViewer.tsx: removed ReactPlayer import, unused originalContent state,
  node parameters from markdown code components, audio variable
- HostManager.tsx: removed onSelectView and updatedHost parameters
- TunnelViewer.tsx: removed TunnelConnection import

Reduced lint errors from 271 to 208 (63 errors fixed total)

src/ui/Desktop/Apps/File Manager/components/DiffViewer.tsx

@@ -61,7 +61,7 @@ export function DiffViewer({
           userId: sshHost.userId,
         });
       }
-    } catch (error) {
+    } catch {
       await connectSSH(sshSessionId, {
         hostId: sshHost.id,
         ip: sshHost.ip,

src/ui/Desktop/Apps/File Manager/components/FileViewer.tsx

@@ -60,7 +60,6 @@ import {
 import { autocompletion, completionKeymap } from "@codemirror/autocomplete";
 import { PhotoProvider, PhotoView } from "react-photo-view";
 import "react-photo-view/dist/react-photo-view.css";
-import ReactPlayer from "react-player";
 import AudioPlayer from "react-h5-audio-player";
 import "react-h5-audio-player/lib/styles.css";
 import ReactMarkdown from "react-markdown";
@@ -311,9 +310,7 @@ export function FileViewer({
 }: FileViewerProps) {
   const { t } = useTranslation();
   const [editedContent, setEditedContent] = useState(content);
-  const [originalContent, setOriginalContent] = useState(
-    savedContent || content,
-  );
+  const [, setOriginalContent] = useState(savedContent || content);
   const [hasChanges, setHasChanges] = useState(false);
   const [showLargeFileWarning, setShowLargeFileWarning] = useState(false);
   const [forceShowAsText, setForceShowAsText] = useState(false);
@@ -1097,7 +1094,7 @@ export function FileViewer({
                     <ReactMarkdown
                       remarkPlugins={[remarkGfm]}
                       components={{
-                        code({ node, inline, className, children, ...props }) {
+                        code({ inline, className, children, ...props }) {
                           const match = /language-(\w+)/.exec(className || "");
                           return !inline && match ? (
                             <SyntaxHighlighter
@@ -1380,8 +1377,7 @@ export function FileViewer({
                     <div className="rounded-lg overflow-hidden">
                       <AudioPlayer
                         src={audioUrl}
-                        onLoadedMetadata={(e) => {
-                          const audio = e.currentTarget;
+                        onLoadedMetadata={() => {
                           if (onMediaDimensionsChange) {
                             onMediaDimensionsChange({
                               width: 600,

src/ui/Desktop/Apps/Host Manager/HostManager.tsx

@@ -15,7 +15,6 @@ import { useTranslation } from "react-i18next";
 import type { SSHHost, HostManagerProps } from "../../../types/index";
 
 export function HostManager({
-  onSelectView,
   isTopbarOpen,
 }: HostManagerProps): React.ReactElement {
   const { t } = useTranslation();
@@ -30,7 +29,7 @@ export function HostManager({
     setActiveTab("add_host");
   };
 
-  const handleFormSubmit = (updatedHost?: SSHHost) => {
+  const handleFormSubmit = () => {
     setEditingHost(null);
     setActiveTab("host_viewer");
   };

src/ui/Desktop/Apps/Tunnel/TunnelViewer.tsx

@@ -1,11 +1,7 @@
 import React from "react";
 import { TunnelObject } from "./TunnelObject.tsx";
 import { useTranslation } from "react-i18next";
-import type {
-  SSHHost,
-  TunnelConnection,
-  TunnelStatus,
-} from "../../../types/index.js";
+import type { SSHHost, TunnelStatus } from "../../../types/index.js";
 
 interface SSHTunnelViewerProps {
   hosts: SSHHost[];