feat: improve remote browser tree routing

- Allow remote host aliases passed via --browser to fan out for read-only
  multi-browser SDK paths while preserving strict routing for mutating commands.
- Add remote host grouping and scoped profile labels to tabs tree output so
  global views avoid repeated host prefixes.
- Carry browser family metadata through remote targets, tabs, and groups and
  style tree browser labels by family.
- Split CLI rendering helpers into a typed rendering package with dedicated
  common, label, tabs-tree, and windows-tree modules.
- Bump browser-cli and extension versions to 0.15.5.
- Cover the new routing and rendering behavior with unit and CLI tests.

tests/test_client.py

@@ -342,7 +342,7 @@ def test_active_browser_targets_includes_remote_targets(monkeypatch, tmp_path):
     def fake_send_command(command, args=None, profile=None, remote=None, key=None):
         assert command == "browser-cli.targets"
         assert remote == endpoint
-        return [{"profile": "work", "displayName": "work"}]
+        return [{"profile": "work", "displayName": "work", "browserName": "Firefox"}]
 
     monkeypatch.setattr("browser_cli.client.core.send_command", fake_send_command)
 
@@ -352,6 +352,8 @@ def test_active_browser_targets_includes_remote_targets(monkeypatch, tmp_path):
     assert targets[0].profile == "work"
     assert targets[0].display_name == "browser-host.example:work"
     assert targets[0].remote == endpoint
+    assert targets[0].browser_name == "Firefox"
+    assert targets[0].display_group == "browser-host.example"
 
 def test_looks_like_domain():
     assert _looks_like_domain("browsercli.yiprawr.dev") is True