refactor: enhance markdown processing and code structure

- Updated the ConduitMarkdown class to streamline markdown rendering, improving maintainability and clarity.
- Refactored the markdown configuration to utilize new methods for building markdown blocks and handling LaTeX syntax.
- Improved the StreamingMarkdownWidget to leverage the updated markdown processing logic, ensuring a cohesive user experience.
- Enhanced the handling of Mermaid diagrams and LaTeX rendering, providing better support for complex markdown content.

lib/shared/widgets/markdown/latex_block_widget.dart

@@ -0,0 +1,41 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_math_fork/flutter_math.dart';
+
+import '../../theme/theme_extensions.dart';
+
+class LatexBlockWidget extends StatelessWidget {
+  const LatexBlockWidget({
+    super.key,
+    required this.content,
+    required this.isInline,
+    required this.style,
+    required this.isDark,
+  });
+
+  final String content;
+  final bool isInline;
+  final TextStyle style;
+  final bool isDark;
+
+  @override
+  Widget build(BuildContext context) {
+    final mathWidget = Math.tex(
+      content,
+      mathStyle: MathStyle.text,
+      textStyle: style,
+      textScaleFactor: 1,
+      onErrorFallback: (error) {
+        return Text(content, style: style.copyWith(color: Colors.red));
+      },
+    );
+
+    if (isInline) {
+      return mathWidget;
+    }
+
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: Spacing.xs),
+      child: Center(child: mathWidget),
+    );
+  }
+}