Add diff syntax highlighting

Cargo.lock

@@ -4105,6 +4105,7 @@ dependencies = [
  "tree-sitter-bash",
  "tree-sitter-c",
  "tree-sitter-css",
+ "tree-sitter-diff",
  "tree-sitter-go",
  "tree-sitter-highlight",
  "tree-sitter-html",
@@ -6138,6 +6139,16 @@ dependencies = [
  "tree-sitter-language",
 ]
 
+[[package]]
+name = "tree-sitter-diff"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfe1e5ca280a65dfe5ba4205c1bcc84edf486464fed315db53dee6da9a335889"
+dependencies = [
+ "cc",
+ "tree-sitter-language",
+]
+
 [[package]]
 name = "tree-sitter-go"
 version = "0.23.4"

crates/radicle-types/Cargo.toml

@@ -24,6 +24,7 @@ thiserror = { version = "2.0.12" }
 tree-sitter-bash = { version = "0.23.3" }
 tree-sitter-c = { version = "0.23.2" }
 tree-sitter-css = { version = "0.23.1" }
+tree-sitter-diff = { version = "0.1.0" }
 tree-sitter-go = { version = "0.23.4" }
 tree-sitter-highlight = { version = "0.25.3" }
 tree-sitter-html = { version = "0.23.2" }

crates/radicle-types/src/syntax.rs

@@ -250,6 +250,7 @@ impl Highlighter {
             ("rust", Self::config("rust")),
             ("json", Self::config("json")),
             ("jsdoc", Self::config("jsdoc")),
+            ("diff", Self::config("diff")),
             ("typescript", Self::config("typescript")),
             ("javascript", Self::config("javascript")),
             ("markdown", Self::config("markdown")),
@@ -337,6 +338,16 @@ impl Highlighter {
                 )
                 .expect("Highlighter::config: highlight configuration must be valid"),
             ),
+            "diff" => Some(
+                ts::HighlightConfiguration::new(
+                    tree_sitter_diff::LANGUAGE.into(),
+                    language,
+                    tree_sitter_diff::HIGHLIGHTS_QUERY,
+                    "",
+                    "",
+                )
+                .expect("Highlighter::config: highlight configuration must be valid"),
+            ),
             "json" => Some(
                 ts::HighlightConfiguration::new(
                     tree_sitter_json::LANGUAGE.into(),