diff --git a/src/trackChangesModel.ts b/src/trackChangesModel.ts
index 9351551..b892dc2 100644
--- a/src/trackChangesModel.ts
+++ b/src/trackChangesModel.ts
@@ -642,15 +642,6 @@ function isCloseSentinel(m: string): boolean {
   return m === SENT.claude.close || m === SENT.human.close;
 }
 
-function authorBadge(authors: Set<AuthorKind>): { cls: string; label: string } | null {
-  if (authors.size === 0) return null;
-  if (authors.size > 1) return { cls: "cw-mixed", label: "mixed" };
-  const only = [...authors][0];
-  return only === "claude"
-    ? { cls: "cw-by-claude", label: "Claude" }
-    : { cls: "cw-by-human", label: "You" };
-}
-
 // Markdown emphasis / code delimiters whose RUNS must never be split by an
 // injected sentinel — a sentinel between two run chars (e.g. `*|*`) breaks
 // markdown-it's delimiter pairing (#33 CASE1).
diff --git a/test/trackChangesModel.test.ts b/test/trackChangesModel.test.ts
index 101ea91..bf8173f 100644
--- a/test/trackChangesModel.test.ts
+++ b/test/trackChangesModel.test.ts
@@ -263,9 +263,7 @@ describe("wordDiffByAuthor", () => {
   });
 });
 
-import { renderPlain } from "../src/trackChangesModel";
-
-import { wordEditHunks, decorationPlan } from "../src/trackChangesModel";
+import { renderPlain, wordEditHunks, decorationPlan } from "../src/trackChangesModel";
 
 test("committed change: wordEditHunks(current, baseline) → start/end index current; replacement is baseline text", () => {
   const baseline = "the light mode";