diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
index 3918fdac4029e5973c74fe74c258fe296d081067..cf04d28e1200b95759070779b769a33c8e5e1648 100644
--- a/apps/web/src/components/ChatView.tsx
+++ b/apps/web/src/components/ChatView.tsx
@@ -60,7 +60,7 @@ import {
 import { isScrollContainerNearBottom } from "../chat-scroll";
 import { useStore } from "../store";
 import { MAX_THREAD_TERMINAL_COUNT, type ChatImageAttachment } from "../types";
-import { getVscodeIconUrlForEntry } from "../vscode-icons";
+import { basenameOfPath, getVscodeIconUrlForEntry } from "../vscode-icons";
 import { useTheme } from "../hooks/useTheme";
 import BranchToolbar from "./BranchToolbar";
 import GitActionsControl from "./GitActionsControl";
@@ -125,12 +125,6 @@ function workToneClass(tone: "thinking" | "tool" | "info" | "error"): string {
   return "text-muted-foreground/40";
 }
 
-function basenameOfPath(pathValue: string): string {
-  const slashIndex = pathValue.lastIndexOf("/");
-  if (slashIndex === -1) return pathValue;
-  return pathValue.slice(slashIndex + 1);
-}
-
 type SessionContinuityState = "resumed" | "new" | "fallback_new";
 
 interface EnsuredSessionInfo {
diff --git a/apps/web/src/vscode-icons.ts b/apps/web/src/vscode-icons.ts
index 696e5b23dc80caeb1f9d93644a30d5210b406336..e2c0d95834270fcc0a8122d3942b9b72a34f220c 100644
--- a/apps/web/src/vscode-icons.ts
+++ b/apps/web/src/vscode-icons.ts
@@ -66,7 +66,7 @@ function toLowercaseLookup(source: Record<string, string>): Record<string, strin
   return lookup;
 }
 
-function basenameOfPath(pathValue: string): string {
+export function basenameOfPath(pathValue: string): string {
   const slashIndex = pathValue.lastIndexOf("/");
   if (slashIndex === -1) return pathValue;
   return pathValue.slice(slashIndex + 1);
@@ -88,7 +88,10 @@ function extensionCandidates(fileName: string): string[] {
   return [...candidates];
 }
 
-function resolveLanguageFallbackDefinition(pathValue: string, theme: "light" | "dark"): string | null {
+function resolveLanguageFallbackDefinition(
+  pathValue: string,
+  theme: "light" | "dark",
+): string | null {
   const basename = basenameOfPath(pathValue).toLowerCase();
   const languageIds = theme === "light" ? lightLanguageIds : darkLanguageIds;
 
@@ -99,8 +102,9 @@ function resolveLanguageFallbackDefinition(pathValue: string, theme: "light" | "
 
   for (const candidate of extensionCandidates(basename)) {
     const languageId =
-      localLanguageIdByExtensionOverrides[candidate as keyof typeof localLanguageIdByExtensionOverrides] ??
-      languageIdByExtension[candidate];
+      localLanguageIdByExtensionOverrides[
+        candidate as keyof typeof localLanguageIdByExtensionOverrides
+      ] ?? languageIdByExtension[candidate];
     if (!languageId) continue;
     return languageIds[languageId] ?? darkLanguageIds[languageId] ?? null;
   }