diff --git a/frontend/editor/public/locales/en-US/translation.toml b/frontend/editor/public/locales/en-US/translation.toml
index be90cb180a..eb2c80c981 100644
--- a/frontend/editor/public/locales/en-US/translation.toml
+++ b/frontend/editor/public/locales/en-US/translation.toml
@@ -4102,6 +4102,12 @@ deviceHint = "Removes the local copy. The cloud copy is kept."
 everywhere = "Everywhere"
 everywhereHint = "Deletes the file from this device and the cloud."
 
+[filesPage.diskLink]
+conflict = "Disk changed"
+conflictHint = "The file on disk changed while you had unsaved edits. Your version is shown - saving will overwrite the one on disk."
+orphaned = "Not on disk"
+orphanedHint = "The original at {{path}} is gone. This copy is only here - saving it will ask for a new location."
+
 [filesPage.empty]
 hint = "Drop PDFs anywhere on this page to upload, or use the New folder button to organize your files."
 newFolderCta = "Create folder"
@@ -4189,12 +4195,6 @@ newFolderPlaceholder = "Folder name"
 newFolderToggle = "Create new folder…"
 title = "Move to folder"
 
-[filesPage.diskLink]
-conflict = "Disk changed"
-conflictHint = "The file on disk changed while you had unsaved edits. Your version is shown - saving will overwrite the one on disk."
-orphaned = "Not on disk"
-orphanedHint = "The original at {{path}} is gone. This copy is only here - saving it will ask for a new location."
-
 [filesPage.origin]
 all = "All sources"
 cloud = "Cloud"
diff --git a/frontend/editor/src/core/services/diskFileSync.test.ts b/frontend/editor/src/core/services/diskFileSync.test.ts
index 9bc0a829b7..8458c8b0d6 100644
--- a/frontend/editor/src/core/services/diskFileSync.test.ts
+++ b/frontend/editor/src/core/services/diskFileSync.test.ts
@@ -31,8 +31,11 @@ vi.mock("@app/services/fileStorage", () => ({
 
 const downloadFileWithPolicy = vi.hoisted(() =>
   vi.fn(
-    async (_request: Record<string, unknown>) =>
-      ({ savedPath: "C:/elsewhere/report.pdf" }) as any,
+    async (
+      _request: Record<string, unknown>,
+    ): Promise<{ savedPath?: string; cancelled?: boolean }> => ({
+      savedPath: "C:/elsewhere/report.pdf",
+    }),
   ),
 );
 vi.mock("@app/services/exportWithPolicy", () => ({ downloadFileWithPolicy }));
diff --git a/frontend/editor/src/core/services/diskFileSync.ts b/frontend/editor/src/core/services/diskFileSync.ts
index 28d192ce31..e8bb60bcd7 100644
--- a/frontend/editor/src/core/services/diskFileSync.ts
+++ b/frontend/editor/src/core/services/diskFileSync.ts
@@ -274,6 +274,19 @@ export async function saveOrphanAsCopy(
   }
 }
 
+/** The bit of i18next this module needs, if it has been initialised at all. */
+interface Translator {
+  t: (key: string, options?: Record<string, unknown>) => string;
+}
+
+function isTranslator(value: unknown): value is Translator {
+  return (
+    typeof value === "object" &&
+    value !== null &&
+    typeof (value as Translator).t === "function"
+  );
+}
+
 /**
  * Best-effort translation without a hard dependency on i18n being initialised —
  * this module runs from storage/hydration paths that have no React context. The
@@ -286,8 +299,8 @@ function translate(
   params?: Record<string, string>,
 ): string {
   try {
-    const i18next = (globalThis as Record<string, any>)?.i18next;
-    if (i18next && typeof i18next.t === "function") {
+    const i18next = (globalThis as Record<string, unknown>).i18next;
+    if (isTranslator(i18next)) {
       return i18next.t(key, { defaultValue, ...params });
     }
   } catch {
diff --git a/frontend/editor/src/core/services/pruneMissingRecentFiles.test.ts b/frontend/editor/src/core/services/pruneMissingRecentFiles.test.ts
index 416d7e7398..73cb372d5f 100644
--- a/frontend/editor/src/core/services/pruneMissingRecentFiles.test.ts
+++ b/frontend/editor/src/core/services/pruneMissingRecentFiles.test.ts
@@ -1,6 +1,7 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import type { StirlingFileStub } from "@app/types/fileContext";
 import type { FileId } from "@app/types/file";
+import type { ToolId } from "@app/types/toolId";
 
 const disk = vi.hoisted(() => ({
   supported: true,
@@ -94,7 +95,7 @@ describe("pruneMissingRecentFiles", () => {
         id: "edited" as FileId,
         localFilePath: "C:/docs/gone.pdf",
         versionNumber: 3,
-        toolHistory: [{ toolId: "split" as any, timestamp: 1 }],
+        toolHistory: [{ toolId: "split" as ToolId, timestamp: 1 }],
       }),
     ];
     const result = await pruneMissingRecentFiles(stubs);