feat(M01): 쉬운 단가산출 시험 단추 + 빈 창 — EasyCalc 폴더 신설

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016PSXsvyDxjNmufteN5bqmt

M01_MasterData/EasyCalc/M01_EasyCalc_Entry.ts

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+/* =============================================================================
+ * M01_EasyCalc_Entry.ts
+ * 쉬운 단가산출 시험 길 — 들어가는 단추 + 빈 창(틀만). 이 폴더째 지워도 됨.
+ * ========================================================================== */
+
+import { currentLanguageIndex } from "@ui/ui_template_locale";
+import { createButton, el } from "@ui/ui_template_elements";
+import { openModal } from "@ui/ui_template_modal";
+import "./M01_EasyCalc_Style.css";
+
+const TEXT = {
+  Open: ["쉬운 단가산출(시험)", "Easy unit-price (trial)"],
+  Title: ["쉬운 단가산출", "Easy unit-price"],
+  Ready: ["준비 중", "Coming soon"],
+  Close: ["닫기", "Close"],
+} as const;
+
+const te = (key: keyof typeof TEXT): string => TEXT[key][currentLanguageIndex];
+
+/** 「식으로 새로 만들기」 옆에 놓는 단추 — 누르면 빈 창 */
+export function createEasyCalcButton(): HTMLButtonElement {
+  return createButton({
+    label: te("Open"),
+    variant: "filled",
+    onClick: () =>
+      openModal({
+        title: te("Title"),
+        closeLabel: te("Close"),
+        mount: (body) =>
+          body.append(el("p", { className: "m01-easycalc__ready", text: te("Ready") })),
+      }),
+  });
+}

M01_MasterData/EasyCalc/M01_EasyCalc_Style.css

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+.m01-easycalc__ready {
+  margin: 0;
+  padding: var(--spacing-16) 0;
+  color: var(--color-text-muted);
+  font-size: var(--text-body-sm);
+}