fix(files): hide desktop-only reveal action and label download in browser clients

Reveal-in-file-manager was always offered whenever the server exposed
revealPath, including in a plain browser tab where there is no local
file manager to reveal into. Gate it behind a new isBrowserClientRuntime
check (web platform, no Electron shell) and relabel the save action to
"Download" for that case, since it triggers a browser-style file
download rather than an in-place save.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/ui/src/lib/desktop.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, test } from 'bun:test';
+
+import { isBrowserClientRuntime } from './desktop';
+
+describe('browser client runtime', () => {
+  test('uses browser file behavior only outside the Electron shell', () => {
+    expect(isBrowserClientRuntime('web', false)).toBe(true);
+    expect(isBrowserClientRuntime('web', true)).toBe(false);
+  });
+
+  test('keeps desktop and VS Code runtime behavior out of browser-only flows', () => {
+    expect(isBrowserClientRuntime('desktop', false)).toBe(false);
+    expect(isBrowserClientRuntime('vscode', false)).toBe(false);
+  });
+});

packages/ui/src/lib/desktop.ts

@@ -1,4 +1,4 @@
-import type { ProjectEntry, TerminalShell } from '@/lib/api/types';
+import type { ProjectEntry, RuntimeAPIs, TerminalShell } from '@/lib/api/types';
 import { getInjectedBootOutcome } from '@/lib/desktopBoot';
 import type { DraftStarterRef } from '@/lib/draftStarters';
 import type { MobileKeyboardMode } from '@/lib/mobileKeyboardMode';
@@ -562,6 +562,15 @@ export const isWebRuntime = (): boolean => {
   return !isVSCodeRuntime();
 };
 
+/**
+ * Electron reuses the web RuntimeAPIs implementation, so distinguish a browser
+ * client from an Electron renderer with both the runtime descriptor and shell.
+ */
+export const isBrowserClientRuntime = (
+  platform: RuntimeAPIs['runtime']['platform'],
+  desktopShell = isDesktopShell(),
+): boolean => platform === 'web' && !desktopShell;
+
 export const getDesktopHomeDirectory = async (): Promise<string | null> => {
   if (typeof window !== 'undefined') {
     const embedded = window.__OPENCHAMBER_HOME__;

packages/ui/src/lib/i18n/messages/en.ts

@@ -1225,6 +1225,7 @@ export const dict = {
   'sidebarFilesTree.menu.rename': 'Rename',
   'sidebarFilesTree.menu.copyPath': 'Copy Path',
   'sidebarFilesTree.menu.save': 'Save',
+  'sidebarFilesTree.menu.download': 'Download',
   'sidebarFilesTree.menu.newFile': 'New File',
   'sidebarFilesTree.menu.newFolder': 'New Folder',
   'sidebarFilesTree.menu.delete': 'Delete',

packages/ui/src/lib/i18n/messages/es.ts

@@ -1191,6 +1191,7 @@ export const dict: Record<I18nKey, string> = {
   "sidebarFilesTree.menu.rename": "Cambiar nombre",
   "sidebarFilesTree.menu.copyPath": "Copiar ruta",
   "sidebarFilesTree.menu.save": "Guardar",
+  "sidebarFilesTree.menu.download": "Descargar",
   "sidebarFilesTree.menu.newFile": "Nuevo archivo",
   "sidebarFilesTree.menu.newFolder": "Nueva carpeta",
   "sidebarFilesTree.menu.delete": "Eliminar",

packages/ui/src/lib/i18n/messages/fr.ts

@@ -1047,6 +1047,7 @@ export const dict = {
   'sidebarFilesTree.menu.rename': 'Rebaptiser',
   'sidebarFilesTree.menu.copyPath': 'Copier le chemin',
   'sidebarFilesTree.menu.save': 'Sauvegarder',
+  'sidebarFilesTree.menu.download': 'Télécharger',
   'sidebarFilesTree.menu.newFile': 'Nouveau fichier',
   'sidebarFilesTree.menu.newFolder': 'Nouveau dossier',
   'sidebarFilesTree.menu.delete': 'Supprimer',

packages/ui/src/lib/i18n/messages/ja.ts

@@ -1221,6 +1221,7 @@ export const dict: Record<I18nKey, string> = {
   'sidebarFilesTree.menu.rename': '名前の変更',
   'sidebarFilesTree.menu.copyPath': 'パスをコピー',
   'sidebarFilesTree.menu.save': '保存',
+  'sidebarFilesTree.menu.download': 'ダウンロード',
   'sidebarFilesTree.menu.newFile': '新しいファイル',
   'sidebarFilesTree.menu.newFolder': '新しいフォルダ',
   'sidebarFilesTree.menu.delete': '削除',

packages/ui/src/lib/i18n/messages/ko.ts

@@ -1228,6 +1228,7 @@ export const dict: Record<I18nKey, string> = {
   'sidebarFilesTree.menu.rename': '이름 변경',
   'sidebarFilesTree.menu.copyPath': '경로 복사',
   'sidebarFilesTree.menu.save': '저장',
+  'sidebarFilesTree.menu.download': '다운로드',
   'sidebarFilesTree.menu.newFile': '새 파일',
   'sidebarFilesTree.menu.newFolder': '새 폴더',
   'sidebarFilesTree.menu.delete': '삭제',

packages/ui/src/lib/i18n/messages/pl.ts

@@ -2708,6 +2708,7 @@ export const dict: Record<I18nKey, string> = {
   'sidebarFilesTree.menu.newFolder': 'Nowy folder',
   'sidebarFilesTree.menu.rename': 'Zmień nazwę',
   'sidebarFilesTree.menu.save': 'Zapisz',
+  'sidebarFilesTree.menu.download': 'Pobierz',
   'sidebarFilesTree.search.clearAria': 'Wyczyść wyszukiwanie',
   'sidebarFilesTree.search.placeholder': 'Szukaj plików...',
   'sidebarFilesTree.state.loading': 'Ładowanie...',

packages/ui/src/lib/i18n/messages/pt-BR.ts

@@ -1191,6 +1191,7 @@ export const dict: Record<I18nKey, string> = {
   "sidebarFilesTree.menu.rename": "Renomear",
   "sidebarFilesTree.menu.copyPath": "Copiar caminho",
   "sidebarFilesTree.menu.save": "Salvar",
+  "sidebarFilesTree.menu.download": "Baixar",
   "sidebarFilesTree.menu.newFile": "Novo arquivo",
   "sidebarFilesTree.menu.newFolder": "Nova pasta",
   "sidebarFilesTree.menu.delete": "Excluir",

packages/ui/src/lib/i18n/messages/uk.ts

@@ -1191,6 +1191,7 @@ export const dict: Record<I18nKey, string> = {
   "sidebarFilesTree.menu.rename": "Перейменувати",
   "sidebarFilesTree.menu.copyPath": "Копіювати шлях",
   "sidebarFilesTree.menu.save": "Зберегти",
+  "sidebarFilesTree.menu.download": "Завантажити",
   "sidebarFilesTree.menu.newFile": "Новий файл",
   "sidebarFilesTree.menu.newFolder": "Нова папка",
   "sidebarFilesTree.menu.delete": "Видалити",

packages/ui/src/lib/i18n/messages/zh-CN.ts

@@ -1191,6 +1191,7 @@ export const dict: Record<I18nKey, string> = {
   'sidebarFilesTree.menu.rename': '重命名',
   'sidebarFilesTree.menu.copyPath': '复制路径',
   'sidebarFilesTree.menu.save': '保存',
+  'sidebarFilesTree.menu.download': '下载',
   'sidebarFilesTree.menu.newFile': '新建文件',
   'sidebarFilesTree.menu.newFolder': '新建文件夹',
   'sidebarFilesTree.menu.delete': '删除',

packages/ui/src/lib/i18n/messages/zh-TW.ts

@@ -1203,6 +1203,7 @@ export const dict: Record<I18nKey, string> = {
   'sidebarFilesTree.menu.rename': '重新命名',
   'sidebarFilesTree.menu.copyPath': '複製路徑',
   'sidebarFilesTree.menu.save': '儲存',
+  'sidebarFilesTree.menu.download': '下載',
   'sidebarFilesTree.menu.newFile': '新增檔案',
   'sidebarFilesTree.menu.newFolder': '新增資料夾',
   'sidebarFilesTree.menu.delete': '刪除',