fix: dialog text color in dark theme

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/common.dart

@@ -1126,25 +1126,21 @@ Widget createDialogContent(String text) {
   final RegExp linkRegExp = RegExp(r'(https?://[^\s]+)');
   bool hasLink = linkRegExp.hasMatch(text);
 
+  // Early return: no link, use default theme color
   if (!hasLink) {
     return SelectableText(text, style: const TextStyle(fontSize: 15));
   }
 
-  return Builder(
-    builder: (context) {
   final List<TextSpan> spans = [];
   int start = 0;
 
-      // Get theme-aware color for non-link text
-      final textColor = Theme.of(context).textTheme.bodyMedium?.color;
-
   linkRegExp.allMatches(text).forEach((match) {
     if (match.start > start) {
       spans.add(TextSpan(text: text.substring(start, match.start)));
     }
     spans.add(TextSpan(
       text: match.group(0) ?? '',
-          style: TextStyle(
+      style: const TextStyle(
         color: Colors.blue,
         decoration: TextDecoration.underline,
       ),
@@ -1164,15 +1160,10 @@ Widget createDialogContent(String text) {
 
   return SelectableText.rich(
     TextSpan(
-          style: TextStyle(
-            color: textColor,
-            fontSize: 15,
-          ),
+      style: const TextStyle(fontSize: 15),
       children: spans,
     ),
   );
-    },
-  );
 }
 
 void msgBox(SessionID sessionId, String type, String title, String text,