fix(M01): 재료 처음 펼치면 자재품목 목록 바로 열림 · 좁은 화면 넓은 표 안내 한 줄 (일감 30)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PAdA5ThqmtVSsbzjusk1cJ

M01_MasterData/M01_MasterData_UI_Page.ts

@@ -80,7 +80,12 @@ function buildPage(): HTMLElement {
   const comboHost = el("div", { className: "m01-master__logic", attrs: { hidden: "" } });
   const elementView = el("div", {
     className: "m01-master__elements",
-    children: [head, notice, body],
+    children: [
+      head,
+      notice,
+      el("p", { className: "m01-master__hint", text: L("M01_WideHint") }),
+      body,
+    ],
   });
 
   const showNotice = (nodes: (HTMLElement | string)[]): void => {