Refine appearance settings and syntax highlighting

Keep parsed chat and tool detail content in sync with appearance token changes. Hide font-family controls on native, use One as the default syntax theme, add Swift highlighting, and give Nord a distinct light palette.

packages/highlight/package.json

@@ -25,6 +25,8 @@
     "typecheck": "tsgo --noEmit"
   },
   "dependencies": {
+    "@codemirror/language": "^6.12.3",
+    "@codemirror/legacy-modes": "^6.5.3",
     "@lezer/common": "^1.5.0",
     "@lezer/cpp": "^1.1.5",
     "@lezer/css": "^1.3.0",

packages/highlight/src/__tests__/highlighter.test.ts

@@ -30,6 +30,22 @@ describe("highlightCode", () => {
     expect(stringToken?.style).toBe("string");
   });
 
+  it("highlights Swift code", () => {
+    const code = 'struct Greeter {\n    let message = "hello"\n}';
+    const result = highlightCode(code, "test.swift");
+
+    expect(result).toHaveLength(3);
+
+    const structToken = result[0].find((t) => t.text === "struct");
+    expect(structToken?.style).toBe("keyword");
+
+    const typeToken = result[0].find((t) => t.text === "Greeter");
+    expect(typeToken?.style).toBe("definition");
+
+    const stringToken = result[1].find((t) => t.text.includes("hello"));
+    expect(stringToken?.style).toBe("string");
+  });
+
   it("highlights TSX code with correct dialect", () => {
     const code = 'const el = <div className="test">hello</div>;';
     const result = highlightCode(code, "test.tsx");

packages/highlight/src/__tests__/parsers.test.ts

@@ -13,6 +13,7 @@ describe("isLanguageSupported", () => {
     expect(isLanguageSupported("test.css")).toBe(true);
     expect(isLanguageSupported("test.html")).toBe(true);
     expect(isLanguageSupported("test.java")).toBe(true);
+    expect(isLanguageSupported("test.swift")).toBe(true);
     expect(isLanguageSupported("test.ex")).toBe(true);
   });
 
@@ -49,6 +50,7 @@ describe("getSupportedExtensions", () => {
     expect(extensions).toContain("py");
     expect(extensions).toContain("go");
     expect(extensions).toContain("rs");
+    expect(extensions).toContain("swift");
     expect(extensions).toContain("json");
   });
 });

packages/highlight/src/__tests__/themes.test.ts

@@ -59,10 +59,19 @@ describe("resolveSyntaxColors", () => {
   });
 
   it("dark-only themes ignore the color scheme", () => {
-    for (const id of ["dracula", "nord"] as const) {
+    for (const id of ["dracula"] as const) {
       expect(resolveSyntaxColors(id, "light")).toEqual(resolveSyntaxColors(id, "dark"));
     }
   });
+
+  it("nord uses a dark text palette in light mode", () => {
+    const light = resolveSyntaxColors("nord", "light");
+    const dark = resolveSyntaxColors("nord", "dark");
+
+    expect(light).not.toEqual(dark);
+    expect(light.variable).toBe("#2e3440");
+    expect(light.comment).toBe("#6b7280");
+  });
 });
 
 describe("isSyntaxThemeId", () => {

packages/highlight/src/parsers.ts

@@ -1,3 +1,5 @@
+import { StreamLanguage } from "@codemirror/language";
+import { swift } from "@codemirror/legacy-modes/mode/swift";
 import { parser as jsParser } from "@lezer/javascript";
 import { parser as jsonParser } from "@lezer/json";
 import { parser as cssParser } from "@lezer/css";
@@ -55,6 +57,8 @@ const parsersByExtension: Record<string, Parser> = {
   yml: yamlParser,
   // Rust
   rs: rustParser,
+  // Swift
+  swift: StreamLanguage.define(swift).parser,
   // Elixir
   ex: elixirParser,
   exs: elixirParser,

packages/highlight/src/themes.ts

@@ -180,8 +180,20 @@ const oneDark: RolePalette = {
   operator: "#56b6c2",
 };
 
-// --- Nord (dark only) ----------------------------------------------------
-const nord: RolePalette = {
+// --- Nord (Snow Storm light / Polar Night dark) ---------------------------
+const nordLight: RolePalette = {
+  base: "#2e3440",
+  keyword: "#5e81ac",
+  comment: "#6b7280",
+  string: "#4f6f3a",
+  number: "#8f5e91",
+  function: "#2e6f8e",
+  type: "#3b7f87",
+  tag: "#5e81ac",
+  attribute: "#8f5e91",
+  operator: "#5e81ac",
+};
+const nordDark: RolePalette = {
   base: "#d8dee9",
   keyword: "#81a1c1",
   comment: "#616e88",
@@ -269,7 +281,7 @@ export function resolveSyntaxColors(
     case "one":
       return expandRolePalette(dark ? oneDark : oneLight);
     case "nord":
-      return expandRolePalette(nord);
+      return expandRolePalette(dark ? nordDark : nordLight);
     case "gruvbox":
       return expandRolePalette(dark ? gruvboxDark : gruvboxLight);
     case "solarized":