feat(md-deck): Add card list navigation and tabbed editor panels

- Move card tab selector to a left sidebar (CardList) with pagination
- Replace separate side toggle and layer panels with EditorTabs
- Move copy code button from layer panel to DeckHeader
- Simplify PropertiesEditorPanel by removing front/back toggle and
  using a select for shape

src/components/md-deck/EditorTabs.tsx

@@ -0,0 +1,59 @@
+import { createSignal } from "solid-js";
+import type { DeckStore } from "./hooks/deckStore";
+import { LayerEditorPanel, PropertiesEditorPanel } from "./editor-panel";
+
+export interface EditorTabsProps {
+  store: DeckStore;
+}
+
+type TabKey = "sizing" | "front" | "back";
+
+/**
+ * 编辑面板：尺寸 / 正面图层 / 背面图层 用标签页切换，节省横向空间
+ */
+export function EditorTabs(props: EditorTabsProps) {
+  const { store } = props;
+  const [tab, setTab] = createSignal<TabKey>("sizing");
+
+  const tabs: { key: TabKey; label: string }[] = [
+    { key: "sizing", label: "尺寸" },
+    { key: "front", label: "正面图层" },
+    { key: "back", label: "背面图层" },
+  ];
+
+  const selectTab = (key: TabKey) => {
+    setTab(key);
+    // 切换正/背面标签时，同步预览的显示面
+    if (key === "front") store.actions.setActiveSide("front");
+    if (key === "back") store.actions.setActiveSide("back");
+  };
+
+  return (
+    <div class="w-64 shrink-0">
+      {/* 标签页切换 */}
+      <div class="flex gap-1 mb-3">
+        {tabs.map((t) => (
+          <button
+            onClick={() => selectTab(t.key)}
+            class={`flex-1 px-3 py-1.5 rounded text-sm font-medium cursor-pointer ${
+              tab() === t.key
+                ? "bg-blue-600 text-white"
+                : "bg-gray-100 text-gray-600 hover:bg-gray-200"
+            }`}
+          >
+            {t.label}
+          </button>
+        ))}
+      </div>
+
+      {tab() === "sizing" ? (
+        <PropertiesEditorPanel store={store} />
+      ) : (
+        <LayerEditorPanel
+          store={store}
+          side={tab() === "front" ? "front" : "back"}
+        />
+      )}
+    </div>
+  );
+}