fix(M01): 계산 멈춤에도 수량 칸 날식 · 까닭 날글 안 찍음 — 마지막 조각 · 빈칸 · 까닭 걸러냄 (PLAN 6장 셋째 줄)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016WRFJmmhPi4exAzHgPZHMT

M01_MasterData/M01_MasterData_UI_LogicLab_Formula.ts

@@ -8,7 +8,7 @@
 import { el } from "@ui/ui_template_elements";
 import type { TextAnswer } from "./M01_MasterData_UI_Logic_Api";
 import { formatMoney } from "./M01_MasterData_UI_Logic_Money";
-import { tx } from "./M01_MasterData_UI_Logic_Text";
+import { safeReason, tx } from "./M01_MasterData_UI_Logic_Text";
 import { tl } from "./M01_MasterData_UI_LogicLab_Text";
 import "./M01_MasterData_UI_LogicLab_Formula.css";
 
@@ -31,7 +31,10 @@ export function buildFormula(host: HTMLElement, ctx: FormulaContext): void {
     host.replaceChildren(
       el("div", {
         className: "m01-logic__reasons",
-        children: [el("strong", { text: tx("Calc_Stopped") }), el("div", { text: text.reason })],
+        children: [
+          el("strong", { text: tx("Calc_Stopped") }),
+          el("div", { text: safeReason(text.reason) }),
+        ],
       }),
     );
     return;
@@ -62,7 +65,7 @@ export function buildFormula(host: HTMLElement, ctx: FormulaContext): void {
               ? [
                   el("div", { text: `${line.이름} : ${line.글}` }),
                   ...(line.까닭
-                    ? [el("div", { className: "m01-logic__muted", text: line.까닭 })]
+                    ? [el("div", { className: "m01-logic__muted", text: safeReason(line.까닭) })]
                     : []),
                 ]
               : [el("div", { className: "m01-logic__muted", text: tl("Formula_Slot") })],