fix(ui): forzar estilos oscuros en opciones de select en panel de admin

src/components/AdminPanel.tsx

@@ -380,11 +380,13 @@ const VOTOS_EMBEBIDOS = ${JSON.stringify(rawVotes, null, 2)};`;
                 <select
                   value={selectedVoter}
                   onChange={(e) => setSelectedVoter(e.target.value)}
-                  className="w-full px-3 py-2.5 bg-white/[0.04] border border-white/10 rounded-xl text-white text-xs focus:border-[#00B7D4] focus:outline-none uppercase font-mono"
+                  className="w-full px-3 py-2.5 bg-[#0f1318] border border-white/10 rounded-xl text-white text-xs focus:border-[#00B7D4] focus:outline-none uppercase font-mono cursor-pointer"
                 >
-                  <option value="">Selecciona votante a remover...</option>
+                  <option value="" className="bg-[#0f1318] text-gray-400 py-1">
+                    Selecciona votante a remover...
+                  </option>
                   {registeredVoters.map((v) => (
-                    <option key={v} value={v}>
+                    <option key={v} value={v} className="bg-[#0f1318] text-white py-1 font-semibold">
                       {v} → {rawVotes[v]}
                     </option>
                   ))}

src/index.css

@@ -120,3 +120,10 @@
 ::-webkit-scrollbar-thumb:hover {
   background: var(--accent);
 }
+
+/* Dark theme enforcement for native dropdown selects */
+select, option, optgroup {
+  background-color: #0f1318 !important;
+  color: #ffffff !important;
+  color-scheme: dark;
+}