feat: add markdown support for formula descriptions

lib/ai/formula_screen.dart

@@ -1,6 +1,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_markdown/flutter_markdown.dart';
 import '../formula_models.dart';
 import '../formula_evaluator.dart';
 import '../corpus.dart';
@@ -106,6 +107,7 @@ class _FormulaScreenState extends State<FormulaScreen> {
           padding: const EdgeInsets.all(16.0),
           child: ListView(
             children: [
+              _buildDescriptionSection(),
               _buildInputSection(),
               const SizedBox(height: 24),
               _buildOutputSection(),
@@ -116,6 +118,38 @@ class _FormulaScreenState extends State<FormulaScreen> {
     );
   }
 
+  Widget _buildDescriptionSection() {
+    if (widget.formula.description == null || 
+        widget.formula.description!.isEmpty) {
+      return const SizedBox.shrink();
+    }
+
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(
+          'Description',
+          style: Theme.of(context).textTheme.titleMedium?.copyWith(
+            fontWeight: FontWeight.bold,
+          ),
+        ),
+        const SizedBox(height: 8),
+        Container(
+          padding: const EdgeInsets.all(8),
+          decoration: BoxDecoration(
+            color: Theme.of(context).colorScheme.surfaceVariant,
+            borderRadius: BorderRadius.circular(8),
+          ),
+          child: MarkdownBody(
+            data: widget.formula.description!,
+            shrinkWrap: true,
+          ),
+        ),
+        const SizedBox(height: 24),
+      ],
+    );
+  }
+
   Widget _buildInputSection() {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,

lib/ai/unit_list.dart

@@ -54,6 +54,11 @@ class _UnitListState extends State<UnitList> {
                   VariableSpec(name: 'mass', unit: 'kilogram'),
                   VariableSpec(name: 'velocity', unit: 'meters_per_second'),
                 ],
+                description : """
+                # titulo
+                hola
+                ## otro titulo
+                """,
                 output: VariableSpec(name: 'energy', unit: 'joule'),
                 d4rtCode: "energy = 0.5 * mass * velocity * velocity;",
               );

pubspec.lock

@@ -150,6 +150,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.0.0"
+  flutter_markdown:
+    dependency: "direct main"
+    description:
+      name: flutter_markdown
+      sha256: "04c4722cc36ec5af38acc38ece70d22d3c2123c61305d555750a091517bbe504"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.23"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -251,6 +259,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.0"
+  markdown:
+    dependency: transitive
+    description:
+      name: markdown
+      sha256: "935e23e1ff3bc02d390bad4d4be001208ee92cc217cb5b5a6c19bc14aaa318c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.3.0"
   matcher:
     dependency: transitive
     description:
@@ -522,4 +538,4 @@ packages:
     version: "3.1.3"
 sdks:
   dart: ">=3.8.1 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.19.0"

pubspec.yaml

@@ -37,6 +37,7 @@ dependencies:
   resource_portable:
   d4rt:
   flutter_d4rt:
+  flutter_markdown: ^0.6.0
 
   collection: any
 dev_dependencies: