fix: prevent browser target and focus surprises

- Respect the globally selected browser when renaming client aliases.
- Pass the resolved local profile into sync and async local transports so
  BROWSER_CLI_PROFILE is honored consistently.
- Stop tabs.active from explicitly focusing the OS browser window, avoiding
  virtual-desktop jumps during tab activation.
- Make window merging skip audible, unmuted windows so video playback windows
  are not selected as merge targets.
- Bump the Python package and extension manifest versions to 0.12.2.
- Add regression coverage for browser selection and focus-stealing behavior.

browser_cli/commands/clients.py

@@ -159,11 +159,14 @@ def _print_clients(all_clients: list) -> None:
   help="Browser profile alias to rename. Overrides the global --browser option for this command.",
 )
 @click.argument("alias")
-def cmd_clients_rename(target_browser, alias):
+@click.pass_context
+def cmd_clients_rename(ctx, target_browser, alias):
   """Set the profile alias used to identify this browser instance."""
+  root_obj = ctx.find_root().obj or {}
+  selected_browser = target_browser or root_obj.get("browser")
   try:
-    _ensure_unique_browser_alias(alias, target_browser)
-    send_command("clients.rename_profile", {"alias": alias}, profile=target_browser)
+    _ensure_unique_browser_alias(alias, selected_browser)
+    send_command("clients.rename_profile", {"alias": alias}, profile=selected_browser)
   except BrowserNotConnected as e:
     console.print(f"[red]Error:[/red] {e}")
     sys.exit(1)