fix(i18n): add missing pin/unpin tab context menu keys

EditorGroupTabBar referenced contextMenu.pinTab/unpinTab (introduced in
5a3a6e2bb) but no locale declared them, so the tab context menu rendered
the raw key path in every language. Rename the unused fixTab/unfixTab
entries to pinTab/unpinTab in all nine locales and add a test asserting
every tab-menu key resolves to text in en (the fallback locale) and that
pin/unpin labels resolve in every locale.

apps/desktop/src/i18n/__tests__/tabContextMenuKeys.spec.ts

@@ -0,0 +1,55 @@
+import { describe, expect, it } from "vitest";
+import en from "../locales/en";
+import es from "../locales/es";
+import it_ from "../locales/it";
+import ja from "../locales/ja";
+import ko from "../locales/ko";
+import ptBR from "../locales/pt-BR";
+import tr from "../locales/tr";
+import zhCN from "../locales/zh-CN";
+import zhTW from "../locales/zh-TW";
+
+// EditorGroupTabBar renders its context menu via `t("contextMenu.<key>")`.
+// When a key is missing everywhere, vue-i18n echoes the key path itself and
+// the menu shows raw text like "contextMenu.pinTab" (regression in 5a3a6e2bb:
+// the component landed without locale entries; spec mocks supplied their own
+// translations, so tests stayed green). en is the fallbackLocale, so a missing
+// en key leaks the raw path in every language — guard the full tab-menu key
+// set against the real en module, not a mock.
+const tabMenuKeys = ["changeOrientation", "closeAllTabs", "closeLeftTabs", "closeOtherTabs", "closeRightTabs", "closeTab", "closeTabGroup", "compactTabTitle", "copyName", "editTabGroup", "fullTabTitle", "pinTab", "resetTabGroup", "splitDown", "splitRight", "unpinTab", "unsplit"] as const;
+
+// Non-English locales are `export default withEnglishFallback({...})`, so
+// these imports are en-merged; the assertions below prove the key resolves to
+// real text for every UI language, while the en test above is the one that
+// actually catches a missing-from-everywhere key.
+const locales: Array<[string, Record<string, unknown>]> = [
+  ["en", en as Record<string, unknown>],
+  ["es", es],
+  ["it", it_],
+  ["ja", ja],
+  ["ko", ko],
+  ["pt-BR", ptBR],
+  ["tr", tr],
+  ["zh-CN", zhCN],
+  ["zh-TW", zhTW],
+];
+
+function contextMenuEntry(locale: Record<string, unknown>, key: string): unknown {
+  const contextMenu = locale["contextMenu"];
+  if (!contextMenu || typeof contextMenu !== "object") return undefined;
+  return (contextMenu as Record<string, unknown>)[key];
+}
+
+describe("tab context menu i18n keys", () => {
+  it.each(tabMenuKeys)("en resolves contextMenu.%s to text", (key) => {
+    const value = contextMenuEntry(en as Record<string, unknown>, key);
+    expect(value, `contextMenu.${key} missing from locales/en.ts`).toBeTypeOf("string");
+    expect(value).not.toBe("");
+  });
+
+  it.each(locales)("%s resolves pin/unpin tab menu labels", (_name, locale) => {
+    for (const key of ["pinTab", "unpinTab"] as const) {
+      expect(contextMenuEntry(locale, key), `${_name} contextMenu.${key}`).toBeTypeOf("string");
+    }
+  });
+});

apps/desktop/src/i18n/locales/en.ts

@@ -3038,8 +3038,8 @@ export default {
     pin: "Pin",
     reorderPinned: "Reorder pinned item",
     unpin: "Unpin",
-    fixTab: "Fix Tab",
+    pinTab: "Pin Tab",
-    unfixTab: "Unfix Tab",
+    unpinTab: "Unpin Tab",
     refreshTab: "Refresh Data",
     renameTab: "Rename Tab",
     duplicateTab: "Duplicate Tab",

apps/desktop/src/i18n/locales/es.ts

@@ -2956,8 +2956,8 @@ export default withEnglishFallback({
     pin: "Fijar",
     reorderPinned: "Reordenar elemento fijado",
     unpin: "Desfijar",
-    fixTab: "Fijar pestaña",
+    pinTab: "Fijar pestaña",
-    unfixTab: "Desfijar pestaña",
+    unpinTab: "Desfijar pestaña",
     refreshTab: "Actualizar datos",
     renameTab: "Renombrar pestaña",
     duplicateTab: "Duplicar pestaña",

apps/desktop/src/i18n/locales/it.ts

@@ -2954,8 +2954,8 @@ export default withEnglishFallback({
     pin: "Fissa",
     reorderPinned: "Riordina elemento fissato",
     unpin: "Sblocca",
-    fixTab: "Blocca scheda",
+    pinTab: "Blocca scheda",
-    unfixTab: "Sblocca scheda",
+    unpinTab: "Sblocca scheda",
     refreshTab: "Aggiorna Dati",
     renameTab: "Rinomina Scheda",
     duplicateTab: "Duplica Scheda",

apps/desktop/src/i18n/locales/ja.ts

@@ -2978,8 +2978,8 @@ export default withEnglishFallback({
     pin: "ピン留め",
     reorderPinned: "ピン留め項目を並べ替え",
     unpin: "ピン留め解除",
-    fixTab: "タブを固定",
+    pinTab: "タブを固定",
-    unfixTab: "タブの固定を解除",
+    unpinTab: "タブの固定を解除",
     refreshTab: "データを更新",
     renameTab: "タブ名を変更",
     duplicateTab: "タブを複製",

apps/desktop/src/i18n/locales/ko.ts

@@ -2848,8 +2848,8 @@ export default withEnglishFallback({
     pin: "고정",
     reorderPinned: "고정 항목 재정렬",
     unpin: "고정 해제",
-    fixTab: "탭 고정",
+    pinTab: "탭 고정",
-    unfixTab: "탭 고정 해제",
+    unpinTab: "탭 고정 해제",
     refreshTab: "데이터 새로고침",
     renameTab: "탭 이름 변경",
     duplicateTab: "탭 복제",

apps/desktop/src/i18n/locales/pt-BR.ts

@@ -2956,8 +2956,8 @@ export default withEnglishFallback({
     pin: "Fixar",
     reorderPinned: "Reordenar item fixado",
     unpin: "Desafixar",
-    fixTab: "Fixar aba",
+    pinTab: "Fixar aba",
-    unfixTab: "Desafixar aba",
+    unpinTab: "Desafixar aba",
     refreshTab: "Atualizar Dados",
     renameTab: "Renomear Aba",
     duplicateTab: "Duplicar Aba",

apps/desktop/src/i18n/locales/tr.ts

@@ -3039,8 +3039,8 @@ export default withEnglishFallback({
     pin: "Sabitle",
     reorderPinned: "Sabitlenmiş öğeyi yeniden sırala",
     unpin: "Sabitlemeyi kaldır",
-    fixTab: "Sekmeyi Sabitle",
+    pinTab: "Sekmeyi Sabitle",
-    unfixTab: "Sekme Sabitlemesini Kaldır",
+    unpinTab: "Sekme Sabitlemesini Kaldır",
     refreshTab: "Verileri Yenile",
     renameTab: "Sekmeyi Yeniden Adlandır",
     duplicateTab: "Sekmeyi Çoğalt",

apps/desktop/src/i18n/locales/zh-CN.ts

@@ -2961,8 +2961,8 @@ export default withEnglishFallback({
     pin: "置顶",
     reorderPinned: "拖动调整置顶顺序",
     unpin: "取消置顶",
-    fixTab: "固定标签页",
+    pinTab: "固定标签页",
-    unfixTab: "取消固定标签页",
+    unpinTab: "取消固定标签页",
     refreshTab: "刷新数据",
     renameTab: "重命名标签页",
     duplicateTab: "复制标签页",

apps/desktop/src/i18n/locales/zh-TW.ts

@@ -2953,8 +2953,8 @@ export default withEnglishFallback({
     pin: "置頂",
     reorderPinned: "拖曳調整置頂順序",
     unpin: "取消置頂",
-    fixTab: "固定分頁",
+    pinTab: "固定分頁",
-    unfixTab: "取消固定分頁",
+    unpinTab: "取消固定分頁",
     refreshTab: "重新整理資料",
     renameTab: "重新命名分頁",
     duplicateTab: "複製分頁",