feat: add markdown view component

Cargo.lock

@@ -1912,8 +1912,10 @@ version = "0.1.0"
 dependencies = [
  "gpui",
  "gpui-native-core",
+ "gpui-native-icons",
  "gpui-native-theme",
  "gpui-native-utils",
+ "pulldown-cmark",
  "similar",
  "tree-sitter",
  "tree-sitter-javascript",
@@ -4235,6 +4237,17 @@ dependencies = [
  "syn 3.0.9",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.13.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3db2be46835f013dd3f4fa7f5f7402c537787b54ebb6fe2b94bbdd7e2669bb7b"
+dependencies = [
+ "bitflags 2.13.2",
+ "memchr",
+ "unicase",
+]
+
 [[package]]
 name = "pulp"
 version = "0.22.3"
@@ -5978,6 +5991,12 @@ version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eaea85b334db583fe3274d12b4cd1880032beab409c0d774be044d4480ab9a94"
 
+[[package]]
+name = "unicase"
+version = "2.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "357cc3acc6a036009fd6c973ed009037c732d60d0b4f6c673e9041497482a28f"
+
 [[package]]
 name = "unicode-bidi"
 version = "0.3.18"