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, 1 insertions, 0 deletions

diff --git a/packages/meshbay-client/src/preload.js b/packages/meshbay-client/src/preload.js
index caad523..3804ad3 100644
--- a/packages/meshbay-client/src/preload.js
+++ b/packages/meshbay-client/src/preload.js
@@ -86,6 +86,7 @@ contextBridge.exposeInMainWorld('meshbay', {
       write: (chunk) => ipcRenderer.invoke('save:write', handle.id, chunk),
       close: () => ipcRenderer.invoke('save:end', handle.id),
       abort: () => ipcRenderer.invoke('save:abort', handle.id),
+      open: () => ipcRenderer.invoke('save:open', handle.id),
     };
   },
 });