Fix dialog text color for dark theme with links

Co-authored-by: rustdesk <71636191+rustdesk@users.noreply.github.com>

flutter/lib/common.dart

@@ -1124,19 +1124,31 @@ class CustomAlertDialog extends StatelessWidget {
 
 Widget createDialogContent(String text) {
   final RegExp linkRegExp = RegExp(r'(https?://[^\s]+)');
+  bool hasLink = linkRegExp.hasMatch(text);
+
+  if (!hasLink) {
+    return SelectableText(text, style: const TextStyle(fontSize: 15));
+  }
+
+  return Builder(
+    builder: (context) {
       final List<TextSpan> spans = [];
       int start = 0;
-  bool hasLink = false;
+      
+      // Get theme-aware colors
+      final textColor = Theme.of(context).textTheme.bodyMedium?.color;
+      final linkColor = Theme.of(context).brightness == Brightness.dark
+          ? Colors.lightBlue
+          : Colors.blue;
 
       linkRegExp.allMatches(text).forEach((match) {
-    hasLink = true;
         if (match.start > start) {
           spans.add(TextSpan(text: text.substring(start, match.start)));
         }
         spans.add(TextSpan(
           text: match.group(0) ?? '',
           style: TextStyle(
-        color: Colors.blue,
+            color: linkColor,
             decoration: TextDecoration.underline,
           ),
           recognizer: TapGestureRecognizer()
@@ -1153,16 +1165,17 @@ Widget createDialogContent(String text) {
         spans.add(TextSpan(text: text.substring(start)));
       }
 
-  if (!hasLink) {
-    return SelectableText(text, style: const TextStyle(fontSize: 15));
-  }
-
       return SelectableText.rich(
         TextSpan(
-      style: TextStyle(color: Colors.black, fontSize: 15),
+          style: TextStyle(
+            color: textColor,
+            fontSize: 15,
+          ),
           children: spans,
         ),
       );
+    },
+  );
 }
 
 void msgBox(SessionID sessionId, String type, String title, String text,