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/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", () => {