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, 20 insertions, 8 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/ops.py b/packages/meshbay-node/src/meshbay_node/ops.py
index c111581..20345bb 100644
--- a/packages/meshbay-node/src/meshbay_node/ops.py
+++ b/packages/meshbay-node/src/meshbay_node/ops.py
@@ -315,7 +315,8 @@ async def list_groups(state: dict) -> dict:
     return {"groups": out}
 
 
-async def attach_group(state: dict, name: str, shared_dir: str) -> dict:
+async def attach_group(state: dict, name: str, shared_dir: str,
+                       upload_dir: str = "") -> dict:
     """
     Write a new [[groups]] block into node.toml.
 
@@ -360,19 +361,30 @@ async def attach_group(state: dict, name: str, shared_dir: str) -> dict:
     block = (f'\n[[groups]]\n'
              f'id          = "{group["id"]}"\n'
              f'name        = "{group["name"]}"\n'
-             f'visibility  = "{group.get("visibility", "private")}"\n'
-             f'\n  [[groups.roots]]\n'
-             f'  path   = "{path}"\n'
-             f'  upload = true\n')
+             f'visibility  = "{group.get("visibility", "private")}"\n')
+    if upload_dir:
+        upload_path = Path(upload_dir).expanduser()
+        try:
+            upload_path.mkdir(parents=True, exist_ok=True)
+        except OSError as e:
+            raise OpError(f"Cannot create {upload_path}: {e}") from e
+        block += f'upload_dir  = "{upload_path}"\n'
+    block += (f'\n  [[groups.roots]]\n'
+              f'  path   = "{path}"\n')
+    if not upload_dir:
+        block += f'  upload = true\n'
     try:
         with conf_path.open("a") as f:
             f.write(block)
     except OSError as e:
         raise OpError(f"Cannot write {conf_path}: {e}", status=500) from e
 
-    return {"group_id": group["id"], "name": group["name"],
-            "shared_dir": str(path), "config": str(conf_path),
-            "note": "restart the node to pick it up"}
+    result = {"group_id": group["id"], "name": group["name"],
+              "shared_dir": str(path), "config": str(conf_path),
+              "note": "restart the node to pick it up"}
+    if upload_dir:
+        result["upload_dir"] = str(upload_path)
+    return result
 
 
 async def add_root(state: dict, group_id: str, path: str, *,