fix(tui): reject malformed COLORFGBG indexes

.changeset/strict-colorfgbg-background.md

@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Ignore malformed COLORFGBG background color indexes during terminal theme detection.

apps/kimi-code/src/tui/theme/detect.ts

@@ -113,7 +113,8 @@ export function parseColorFgBg(value: string | undefined): ResolvedTheme | null
   const parts = value.split(";");
   const bgRaw = parts.at(-1);
   if (bgRaw === undefined) return null;
-  const bg = parseInt(bgRaw, 10);
+  if (!/^\d+$/.test(bgRaw)) return null;
+  const bg = Number.parseInt(bgRaw, 10);
   if (!Number.isInteger(bg)) return null;
   // ANSI 0=black, 1=red, 2=green, 3=yellow, 4=blue, 5=magenta, 6=cyan, 8=bright black.
   const darkBgs = new Set([0, 1, 2, 3, 4, 5, 6, 8]);

apps/kimi-code/test/tui/terminal-theme.test.ts

@@ -15,6 +15,7 @@ import {
   handleTerminalThemeInput,
   installTerminalThemeTracking,
 } from "#/tui/utils/terminal-theme";
+import { parseColorFgBg } from "#/tui/theme/detect";
 
 type InputListener = Parameters<TUIState["ui"]["addInputListener"]>[0];
 const DARK_OSC11_REPORT = "\u001B]11;rgb:2828/2c2c/3434\u0007";
@@ -173,3 +174,11 @@ describe('ColorPalette warning token', () => {
     expect(getBuiltInPalette('light')).toBe(lightColors);
   });
 });
+
+describe("parseColorFgBg", () => {
+  it("rejects malformed background color indexes", () => {
+    expect(parseColorFgBg("0;9")).toBe("light");
+    expect(parseColorFgBg("0;9abc")).toBeNull();
+    expect(parseColorFgBg("0;1.5")).toBeNull();
+  });
+});