chore: enhance markdown processing and UI adjustments in comments input

lib/features/feed/presentation/widgets/plan_widget.dart

@@ -158,14 +158,22 @@ class _PlanWidgetState extends State<PlanWidget> {
                           }
                         }
                         details = result;
+
+                        // Гарантируем, что жирный текст будет распознан
+                        final boldRegex = RegExp(r'\*\*([^*]+)\*\*');
+                        details = details.replaceAllMapped(boldRegex, (match) {
+                          return '<b>${match.group(1)}</b>';
+                        });
+
                         return Html(
                           data: md.markdownToHtml(
-                            details.replaceAll('\n', '<br>'),
-                            extensionSet: md.ExtensionSet.commonMark,
+                            details,
+                            extensionSet: md.ExtensionSet.gitHubFlavored,
                           ),
                       style: {
                         "body": Style(margin: Margins.zero, padding: HtmlPaddings.zero, fontSize: FontSize(16), lineHeight: const LineHeight(1.5)),
                         "p": Style(margin: Margins.only(bottom: 12), color: appTheme.black),
+                        "b, strong": Style(fontWeight: FontWeight.bold, color: appTheme.black),
                         "h1, h2, h3, h4, h5, h6": Style(margin: Margins.only(top: 16, bottom: 8), color: appTheme.black, fontWeight: FontWeight.bold),
                         "h1": Style(fontSize: FontSize(24)),
                         "h2": Style(fontSize: FontSize(20)),