Implement a popup card that renders description markdown

pubspec.lock

@@ -126,6 +126,14 @@ 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
@@ -227,6 +235,14 @@ 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:
@@ -506,4 +522,4 @@ packages:
     version: "3.1.3"
 sdks:
   dart: ">=3.7.2 <4.0.0"
-  flutter: ">=3.18.0-18.0.pre.54"
+  flutter: ">=3.19.0"