Dashboard: hide unreachable servers by default + keep card height consistent

- Unreachable cards now show a disabled 'Starten' button so moderator cards
  stay the same height as reachable ones
- Dashboard hides unreachable servers by default; a toggle button (bottom
  of header area, only visible when unreachable count > 0) flips the view
  and persists the preference in localStorage

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

gsm-frontend/src/components/ServerCard.jsx

@@ -288,10 +288,18 @@ export default function ServerCard({ server, onClick, isAuthenticated, isGuest,
       )}
 
       {/* Server Controls - only for moderators */}
-      {isModerator && !isUnreachable && (
+      {isModerator && (
         <div className="mt-3 pt-3 border-t border-neutral-800">
           <div className="flex flex-wrap gap-2">
-            {(server.status === 'online' || (server.running && server.status !== 'starting' && server.status !== 'stopping')) ? (
+            {isUnreachable ? (
+              <button
+                disabled
+                title="Host nicht erreichbar"
+                className="btn btn-primary btn-sm"
+              >
+                Starten
+              </button>
+            ) : (server.status === 'online' || (server.running && server.status !== 'starting' && server.status !== 'stopping')) ? (
               <>
                 <button
                   onClick={(e) => handleActionClick('stop', e)}

gsm-frontend/src/pages/Dashboard.jsx

@@ -20,6 +20,17 @@ export default function Dashboard({ onLogout }) {
   const [showLogin, setShowLogin] = useState(false)
   const [showSendUpdate, setShowSendUpdate] = useState(false)
   const [mobileMenuOpen, setMobileMenuOpen] = useState(false)
+  const [showUnreachable, setShowUnreachable] = useState(() => {
+    try { return localStorage.getItem('gsm:showUnreachable') === '1' } catch { return false }
+  })
+
+  const toggleShowUnreachable = () => {
+    setShowUnreachable(v => {
+      const next = !v
+      try { localStorage.setItem('gsm:showUnreachable', next ? '1' : '0') } catch {}
+      return next
+    })
+  }
 
   const isGuest = user?.isGuest || role === 'guest'
 
@@ -72,6 +83,8 @@ export default function Dashboard({ onLogout }) {
   const onlineCount = servers.filter(s => s.running).length
   document.title = 'Dashboard | Zeasy GSM'
   const totalPlayers = servers.reduce((sum, s) => sum + (s.players?.online || 0), 0)
+  const unreachableCount = servers.filter(s => s.status === 'unreachable').length
+  const visibleServers = showUnreachable ? servers : servers.filter(s => s.status !== 'unreachable')
 
   return (
     <div className="min-h-screen page-enter">
@@ -260,8 +273,21 @@ export default function Dashboard({ onLogout }) {
             <div className="text-neutral-400">Lade Server...</div>
           </div>
         ) : (
+          <>
+            {unreachableCount > 0 && (
+              <div className="mb-4 flex justify-end">
+                <button
+                  onClick={toggleShowUnreachable}
+                  className="btn btn-ghost btn-sm text-sm text-neutral-400 hover:text-white"
+                >
+                  {showUnreachable
+                    ? `Nicht erreichbare ausblenden (${unreachableCount})`
+                    : `Nicht erreichbare anzeigen (${unreachableCount})`}
+                </button>
+              </div>
+            )}
             <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
-            {servers.map((server, index) => (
+              {visibleServers.map((server, index) => (
               <div
                 key={server.id}
                 className="fade-in-up"
@@ -280,6 +306,7 @@ export default function Dashboard({ onLogout }) {
               </div>
             ))}
             </div>
+          </>
         )}
 
         {/* Discord Bot Invite Section */}