fix(desktop): preserve cleared spoken languages (#5281)

Persist an explicit empty spoken language list so OS language defaults are not restored after reopening settings.

Author: ComputelessComputer

apps/desktop/src/store/tinybase/persister/settings/persister.test.ts

@@ -463,6 +463,30 @@ describe("settingsPersister roundtrip", () => {
     expect(result.language).toEqual({});
   });
 
+  test("storeValuesToSettings preserves explicitly cleared spoken languages", () => {
+    const [tables, values] = settingsToContent({
+      language: {
+        ai_language: "ko",
+        spoken_languages: [],
+      },
+    });
+    const store = createMergeableStore()
+      .setTablesSchema(SCHEMA.table)
+      .setValuesSchema(SCHEMA.value);
+    store.setTables(tables);
+    store.setValues(values);
+
+    const storeValues = store.getValues();
+    const result = storeValuesToSettings(
+      storeValues as Record<string, unknown>,
+      { ai_language: "ko", spoken_languages: ["ko", "en"] },
+    );
+
+    expect(result.language).toEqual({
+      spoken_languages: [],
+    });
+  });
+
   test("storeValuesToSettings keeps language values differing from OS locale defaults", () => {
     const [tables, values] = settingsToContent({
       language: {

apps/desktop/src/store/tinybase/persister/settings/transform.ts

@@ -170,7 +170,13 @@ export function storeValuesToSettings(
       continue;
     }
     if ("default" in config && value === config.default) {
-      continue;
+      const isClearedSpokenLanguages =
+        key === "spoken_languages" &&
+        (languageDefaults?.spoken_languages?.length ?? 0) > 0;
+
+      if (!isClearedSpokenLanguages) {
+        continue;
+      }
     }
     if (languageDefaults) {
       if (