Add DEBUG-gated panel to buy any card in the shop

When the server's DEBUG env var is on, expose a card catalog endpoint
and a collapsible client panel that drops any pet or food straight into
your deck (free, off-turn). Gated server-side so it is inert in normal
play.

web/src/components/Table.tsx

@@ -5,6 +5,7 @@ import { ShopPhase } from './ShopPhase'
 import { ArrangePhase } from './ArrangePhase'
 import { BattlePhase } from './BattlePhase'
 import { GameOver } from './GameOver'
+import { DebugPanel } from './DebugPanel'
 
 // Table connects to the game and routes to the right phase screen.
 export function Table({ session, onLeave }: { session: Session; onLeave: () => void }) {
@@ -69,6 +70,12 @@ export function Table({ session, onLeave }: { session: Session; onLeave: () => v
         <div className="banner banner-warn">An opponent is disconnected…</div>
       )}
       {error && <div className="toast">{error}</div>}
+      {view.debug && (
+        <DebugPanel
+          canGrant={view.phase === 'shop' || view.phase === 'cleanup'}
+          send={send}
+        />
+      )}
     </div>
   )
 }