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, 9 insertions, 0 deletions

diff --git a/packages/meshbay-client/src/main.js b/packages/meshbay-client/src/main.js
index 6228189..0ed06d9 100644
--- a/packages/meshbay-client/src/main.js
+++ b/packages/meshbay-client/src/main.js
@@ -505,6 +505,7 @@ function registerBridge() {
   // The renderer still never names a path. It asks; the user chooses once; the
   // main process holds the handle and the renderer refers to it by an opaque id.
   const sinks = new Map();
+  const completedPaths = new Map();
   let sinkId = 0;
 
   /** `name`, or the first "name (n).ext" that is not taken — never an overwrite. */
@@ -611,10 +612,18 @@ function registerBridge() {
     const sink = sinks.get(String(id));
     if (!sink) return false;
     sinks.delete(String(id));
+    completedPaths.set(String(id), sink.path);
     await new Promise((resolve) => sink.stream.end(resolve));
     return true;
   });
 
+  ipcMain.handle('save:open', async (_e, id) => {
+    const p = completedPaths.get(String(id));
+    if (!p) return false;
+    await shell.openPath(p);
+    return true;
+  });
+
   ipcMain.handle('save:abort', async (_e, id) => {
     const sink = sinks.get(String(id));
     if (!sink) return false;