feat(ui): 11-point UI overhaul — tabs, transfers, settings, uploads

Hub/UI:
- Icon-only group tabs (chat, files, settings) with per-group default tab
- Transfer widget: filename becomes a clickable link to open completed downloads
- Pulse animation on transfer icon (pale→dark green) while active
- Download button feedback in FilePreview (spinner, auto-reset)
- Group mute toggle persists across navigation
- Login page autofocus, chat refocus after send
- Theme toggle closes menu, status badge and duplicate connecting removed
- Create-folder restricted to operators, download-path note removed
- User preferences API (CRUD) with Alembic migration
- Profile: email display/edit via PATCH /v1/users/me
- Settings: "Defaults" section for default tab selector
- All 10 locale files updated

Node:
- upload_dir in node.toml: separate filesystem path for uploads
- Root.direct flag: uploads land at root path, no subdirectory
- CLI --upload-dir flag on `group add`
- Admin UI accepts upload_dir

Client (Electron):
- shell.openPath bridge for opening completed downloads
- platform.js passes open callback from native save

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
index 3276db8..f249835 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/locales/zh-CN.js
@@ -122,6 +122,7 @@ export default {
   'status.idle': '空闲',
   'status.discovering': '正在查找 node…',
   'status.connecting': '正在通过 WebRTC 连接…',
+  'status.connecting_short': '正在连接…',
   'status.fetching': '正在获取索引…',
   'status.files': {
     other: '{n} 个文件',
@@ -161,13 +162,17 @@ export default {
   'settings.dl_choose': '选择文件夹',
   'settings.dl_change': '更改',
   'settings.dl_forget': '忘记',
-  'settings.dl_path_note': '网页无法被指定一个路径，因此这里没有什么需要输入：'
-    + '由您的浏览器授予对所选文件夹的访问权限，而 MeshBay 只会写入该文件夹之内。'
-    + '每个会话可能会要求您确认一次。',
-  'settings.dl_unsupported': '此浏览器无法写入您指定的文件夹（不支持 File System '
-    + 'Access API），因此下载内容会进入它自己的下载文件夹。Chrome 和 Edge 支持自行选择。',
+
   'settings.profile': '个人资料',
   'settings.username': '用户名',
+  'settings.email': 'Email',
+  'settings.email_save': 'Save',
+  'settings.email_saved': 'Email updated',
+  'settings.notif_global_disable': 'Disable all notifications',
+  'settings.notif_global_hint': 'When enabled, no notifications are created for any group.',
+  'settings.defaults': '默认值',
+  'settings.default_tab': 'Default tab',
+  'settings.default_tab_hint': 'Which tab opens first when you enter a group.',
   'settings.node_pins': 'node 身份',
   'settings.node_pins_hint': '每个 node 的身份密钥都会在您首次连接时被记住。'
     + '如果它发生变化，连接会被拒绝——只有当运营者重装 node 时才应如此。'
@@ -421,6 +426,8 @@ export default {
   'chat.jump_new': '新消息',
   'group.leave': '退出群组',
   'group.leave_confirm': '退出“{name}”？您将失去其文件和聊天的访问权。您上传的文件仍留在 node 上，node 也会保留它为您固定的身份，直到其运营者将其移除。',
+  'group.mute': 'Mute notifications',
+  'group.unmute': 'Unmute notifications',
   'profile.title': '个人资料',
   'usermenu.profile': '个人资料',
 };