feat: X 게시글 해시태그 하이라이트 및 클릭 링크 추가

- 해시태그(#xxx): primary 색상 하이라이트, 클릭 시 x.com/hashtag/xxx로 이동
- URL: primary 색상 + 밑줄, 클릭 시 해당 URL로 이동
- 웹(모바일/PC), 앱 모두 적용

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/lib/views/schedule/schedule_detail_view.dart

@@ -499,13 +499,8 @@ class _ScheduleDetailViewState extends ConsumerState<ScheduleDetailView> {
           // 본문
           Padding(
             padding: const EdgeInsets.all(16),
-            child: Text(
+            child: _buildLinkedText(
               decodeHtmlEntities(schedule.content ?? schedule.title),
-              style: const TextStyle(
-                fontSize: 15,
-                height: 1.5,
-                color: AppColors.textPrimary,
-              ),
             ),
           ),
           // 이미지
@@ -691,6 +686,69 @@ class _ScheduleDetailViewState extends ConsumerState<ScheduleDetailView> {
     );
   }
 
+  /// 해시태그, URL을 감지해서 링크로 만드는 RichText
+  Widget _buildLinkedText(String text) {
+    // 해시태그 (#xxx) 또는 URL (https://...) 매칭
+    final pattern = RegExp(r'(#[^\s#]+)|(https?://[^\s]+)');
+    final spans = <InlineSpan>[];
+    int lastEnd = 0;
+
+    for (final match in pattern.allMatches(text)) {
+      // 매치 앞의 일반 텍스트
+      if (match.start > lastEnd) {
+        spans.add(TextSpan(
+          text: text.substring(lastEnd, match.start),
+          style: const TextStyle(
+            fontSize: 15,
+            height: 1.5,
+            color: AppColors.textPrimary,
+          ),
+        ));
+      }
+
+      final matched = match.group(0)!;
+      final isHashtag = matched.startsWith('#');
+
+      final url = isHashtag
+          ? 'https://x.com/hashtag/${Uri.encodeComponent(matched.substring(1))}?src=hashtag_click'
+          : matched;
+
+      spans.add(WidgetSpan(
+        alignment: PlaceholderAlignment.baseline,
+        baseline: TextBaseline.alphabetic,
+        child: GestureDetector(
+          onTap: () => _launchUrl(url),
+          child: Text(
+            matched,
+            style: TextStyle(
+              fontSize: 15,
+              height: 1.5,
+              color: AppColors.primary,
+              decoration: isHashtag ? TextDecoration.none : TextDecoration.underline,
+              decorationColor: AppColors.primary,
+            ),
+          ),
+        ),
+      ));
+
+      lastEnd = match.end;
+    }
+
+    // 남은 텍스트
+    if (lastEnd < text.length) {
+      spans.add(TextSpan(
+        text: text.substring(lastEnd),
+        style: const TextStyle(
+          fontSize: 15,
+          height: 1.5,
+          color: AppColors.textPrimary,
+        ),
+      ));
+    }
+
+    return RichText(text: TextSpan(children: spans));
+  }
+
   /// 인증 배지
   Widget _buildVerifiedBadge() {
     return SizedBox(

frontend/src/pages/mobile/schedule/ScheduleDetail.jsx

@@ -13,26 +13,37 @@ import Birthday from './Birthday';
 function linkifyText(text) {
   if (!text) return null;
 
-  // URL 패턴: http(s)://로 시작하거나 일반적인 단축 URL 도메인
+  // 해시태그 또는 URL 매칭
-  const urlPattern = /(https?:\/\/[^\s]+|(?:bit\.ly|youtu\.be|t\.co|goo\.gl|tinyurl\.com)\/[^\s]+)/gi;
+  const pattern = /(#[^\s#]+)|(https?:\/\/[^\s]+|(?:bit\.ly|youtu\.be|t\.co|goo\.gl|tinyurl\.com)\/[^\s]+)/gi;
 
   const parts = [];
   let lastIndex = 0;
   let match;
 
-  while ((match = urlPattern.exec(text)) !== null) {
+  while ((match = pattern.exec(text)) !== null) {
     if (match.index > lastIndex) {
       parts.push(text.slice(lastIndex, match.index));
     }
 
-    let url = match[0];
+    const matched = match[0];
-    const href = url.startsWith('http') ? url : `https://${url}`;
 
-    parts.push(
+    if (matched.startsWith('#')) {
-      <a key={match.index} href={href} target="_blank" rel="noopener noreferrer" className="text-blue-500 hover:underline">
+      // 해시태그
-        {url}
+      const tag = matched.slice(1);
-      </a>
+      parts.push(
-    );
+        <a key={match.index} href={`https://x.com/hashtag/${encodeURIComponent(tag)}?src=hashtag_click`} target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+          {matched}
+        </a>
+      );
+    } else {
+      // URL
+      const href = matched.startsWith('http') ? matched : `https://${matched}`;
+      parts.push(
+        <a key={match.index} href={href} target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+          {matched}
+        </a>
+      );
+    }
 
     lastIndex = match.index + match[0].length;
   }

frontend/src/pages/pc/public/schedule/sections/XSection.jsx

@@ -9,34 +9,39 @@ import { Lightbox } from '@/components/common';
 function linkifyText(text) {
   if (!text) return null;
 
-  // URL 패턴: http(s)://로 시작하거나 일반적인 도메인 패턴
+  // 해시태그 또는 URL 매칭
-  const urlPattern = /(https?:\/\/[^\s]+|(?:bit\.ly|youtu\.be|t\.co|goo\.gl|tinyurl\.com)\/[^\s]+)/gi;
+  const pattern = /(#[^\s#]+)|(https?:\/\/[^\s]+|(?:bit\.ly|youtu\.be|t\.co|goo\.gl|tinyurl\.com)\/[^\s]+)/gi;
 
   const parts = [];
   let lastIndex = 0;
   let match;
 
-  while ((match = urlPattern.exec(text)) !== null) {
+  while ((match = pattern.exec(text)) !== null) {
-    // 매치 전 텍스트
     if (match.index > lastIndex) {
       parts.push(text.slice(lastIndex, match.index));
     }
 
-    // URL
+    const matched = match[0];
-    let url = match[0];
-    // http(s)://가 없으면 추가
-    const href = url.startsWith('http') ? url : `https://${url}`;
 
-    parts.push(
+    if (matched.startsWith('#')) {
-      <a key={match.index} href={href} target="_blank" rel="noopener noreferrer" className="text-blue-500 hover:underline">
+      const tag = matched.slice(1);
-        {url}
+      parts.push(
-      </a>
+        <a key={match.index} href={`https://x.com/hashtag/${encodeURIComponent(tag)}?src=hashtag_click`} target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
-    );
+          {matched}
+        </a>
+      );
+    } else {
+      const href = matched.startsWith('http') ? matched : `https://${matched}`;
+      parts.push(
+        <a key={match.index} href={href} target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+          {matched}
+        </a>
+      );
+    }
 
     lastIndex = match.index + match[0].length;
   }
 
-  // 나머지 텍스트
   if (lastIndex < text.length) {
     parts.push(text.slice(lastIndex));
   }