fix(markdown): broaden trailing-punct lookahead to all word characters

The right-flanking delimiter fix only checked for Korean after closing
** but the same issue occurs with digits and letters (e.g. **text:**1).
Widen lookahead from (?=[가-힣]) to (?=[^\s\p{P}\p{S}]) to match the
exact CommonMark failure condition.

Generated with oh-my-agent

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>

Author: gracefullight

packages/markdown/src/preprocess.integration.test.ts

@@ -57,6 +57,15 @@ describe("preprocessMarkdown integration", () => {
     );
   });
 
+  it("renders bold with trailing colon before digit as strong tags", () => {
+    const input =
+      "**보강된 주요 속성:**1. 할인 효과 적용 (심리적 가격): - 기존에는 판매가(15,000원)만 있었으나";
+
+    expect(renderMarkdown(preprocessMarkdown(input))).toBe(
+      "<p><strong>보강된 주요 속성</strong>:1. 할인 효과 적용 (심리적 가격): - 기존에는 판매가(15,000원)만 있었으나</p>",
+    );
+  });
+
   it("renders bold with space-trimmed trailing paren before Korean as strong tags", () => {
     const input =
       "**다른 디자인의 스타일을 수정하거나, 현재 디자인의 느낌을 완전히 바꿔볼까요? ** 원하시는 작업이 있다면 말씀해 주세요!";

packages/markdown/src/preprocess.test.ts

@@ -52,6 +52,12 @@ describe("preprocessMarkdown", () => {
     expect(preprocessMarkdown("**주의:**사항을 확인하세요")).toBe("**주의**:사항을 확인하세요");
   });
 
+  it("moves colon outside bold markers when followed by digit", () => {
+    expect(preprocessMarkdown("**보강된 주요 속성:**1. 할인 효과 적용")).toBe(
+      "**보강된 주요 속성**:1. 할인 효과 적용",
+    );
+  });
+
   it("does not add space after any bold text followed by Korean", () => {
     expect(preprocessMarkdown("**볼드텍스트**입니다")).toBe("**볼드텍스트**입니다");
   });

packages/markdown/src/preprocess.ts

@@ -6,7 +6,7 @@
  * 1. Trim invalid inner spaces around bold text: `** text **` → `**text**`
  * 2. Move quoted bold text outside markers when followed by Korean: `**'text'**에` → `'**text**'에`
  * 3. Move double-quoted bold text outside markers when followed by Korean: `**"text"**에` → `"**text**"에`
- * 4. Move trailing punctuation outside bold markers when followed by Korean: `**text)**을` → `**text**)`을`
+ * 4. Move trailing punctuation outside bold markers when followed by word char: `**text:**1` → `**text**:1`
  * 5. Tilde escaping to prevent accidental strikethrough: `~` → `\~`
  */
 export function preprocessMarkdown(content: string): string {
@@ -27,10 +27,10 @@ export function preprocessMarkdown(content: string): string {
   // **"text"**에 -> "**text**"에
   processed = processed.replace(/\*\*"([^"]+)"\*\*(?=[가-힣])/g, '"**$1**"');
 
-  // 4. Move trailing punctuation outside bold markers when followed by Korean text
-  // Fixes CommonMark right-flanking delimiter: punct before closing ** + Korean after = no bold
-  // **text(등))**Korean → **text(등)**))Korean
-  processed = processed.replace(/\*\*([^*]+?)([)\]:;,.!?]+)\*\*(?=[가-힣])/g, "**$1**$2");
+  // 4. Move trailing punctuation outside bold markers when followed by word characters
+  // Fixes CommonMark right-flanking delimiter: punct before closing ** + non-punct/non-space after = no bold
+  // **text:**1. list → **text**:1. list | **text(등))**Korean → **text(등)**))Korean
+  processed = processed.replace(/\*\*([^*]+?)([)\]:;,.!?]+)\*\*(?=[^\s\p{P}\p{S}])/gu, "**$1**$2");
 
   // 5. Escape tildes to prevent accidental strikethrough
   processed = processed.replace(/~/g, "\\~");