Add cloud download icon and improve update UI handling

Update UI to use CloudDownload icon instead of RefreshCw
Improve error handling for update checks
Add better visual feedback for update states
Change GitHub link to RealManual repository

app/src/TopBar.tsx

@@ -1,5 +1,5 @@
 import { useState } from "react";
-import { FolderGit2, PanelLeft, PanelRight, Search, Bell, Settings, ChevronDown, RefreshCw, Download } from "lucide-react";
+import { FolderGit2, PanelLeft, PanelRight, Search, Bell, Settings, ChevronDown, CloudDownload, Download } from "lucide-react";
 import { COLORS, FONT } from "./theme";
 import type { WorkspaceView } from "./layoutTypes";
 import { leafIds } from "./layoutTypes";
@@ -51,7 +51,7 @@ function UpdateControl({ update, checking, onCheck }: { update: UpdateInfo | nul
           animation: hasUpdate ? "spaceshPulse 2s ease-in-out infinite" : "none",
         }}
       >
-        <RefreshCw size={15} style={{ animation: checking ? "spaceshSpin 0.8s linear infinite" : "none" }} />
+        <CloudDownload size={15} style={{ animation: checking ? "spaceshBlink 1s ease-in-out infinite" : "none" }} />
       </button>
 
       {open && (
@@ -83,8 +83,10 @@ function UpdateControl({ update, checking, onCheck }: { update: UpdateInfo | nul
               >
                 <Download size={14} /> Скачать {update?.latest}
               </button>
-            ) : (
+            ) : update?.latest ? (
               <div style={{ marginTop: 10, fontSize: 12, color: COLORS.stDone }}>Установлена последняя версия</div>
+            ) : (
+              <div style={{ marginTop: 10, fontSize: 12, color: COLORS.textMuted }}>Не удалось проверить сервер</div>
             )}
 
             <button
@@ -151,7 +153,7 @@ export function TopBar({
       <div style={{ flex: 1 }} />
 
       <style>{`
-        @keyframes spaceshSpin { to { transform: rotate(360deg); } }
+        @keyframes spaceshBlink { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
         @keyframes spaceshPulse { 0%,100% { box-shadow: 0 0 6px rgba(52,211,194,0.35); } 50% { box-shadow: 0 0 14px rgba(52,211,194,0.7); } }
       `}</style>