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_api.py

@@ -470,7 +470,7 @@ class TestTabs:
       tabs = b.tabs.list()
       tabs[0].close()
 
-    assert [tab.browser for tab in tabs] == ["host:work"]
+    assert [tab.browser for tab in tabs] == ["work"]
     assert mock_send.call_args_list == [
       call("tabs.list", {}, profile="work", remote="host:8765", key=None),
       call("tabs.close", {"tabId": 10}, profile="work", remote="host:8765", key=None),
@@ -491,6 +491,28 @@ class TestTabs:
       call("tabs.close", {"tabId": 10}, profile="work", remote="browser-host.example", key="agent"),
     ]
 
+  def test_tabs_list_browser_host_alias_fans_out_to_remote_targets(self, mock_send):
+    b = BrowserCLI(browser="browser-host.example", key="agent")
+    with patch(
+      "browser_cli.remote_targets_for_alias",
+      return_value=[
+        BrowserTarget("main", "browser-host.example:main", "", remote="browser-host.example:8765", browser_name="Chrome"),
+        BrowserTarget("work", "browser-host.example:work", "", remote="browser-host.example:8765", browser_name="Firefox"),
+      ],
+    ):
+      mock_send.side_effect = [[TAB_DATA], [{**TAB_DATA, "id": 11}], None]
+      tabs = b.tabs.list()
+      tabs[1].close()
+
+    assert [tab.browser for tab in tabs] == ["main", "work"]
+    assert [tab.browser_name for tab in tabs] == ["Chrome", "Firefox"]
+    assert [tab.browser_group for tab in tabs] == [None, None]
+    assert mock_send.call_args_list == [
+      call("tabs.list", {}, profile="main", remote="browser-host.example:8765", key="agent"),
+      call("tabs.list", {}, profile="work", remote="browser-host.example:8765", key="agent"),
+      call("tabs.close", {"tabId": 11}, profile="work", remote="browser-host.example:8765", key="agent"),
+    ]
+
   def test_tabs_active_returns_active_tab(self, b, mock_send):
     mock_send.side_effect = [[TAB_DATA], TAB_DATA]
 
@@ -659,7 +681,7 @@ class TestGroups:
       groups = b.groups.list()
       groups[0].close()
 
-    assert [group.browser for group in groups] == ["host:work"]
+    assert [group.browser for group in groups] == ["work"]
     assert mock_send.call_args_list == [
       call("group.list", {}, profile="work", remote="host:8765", key=None),
       call("group.close", {"groupId": 42}, profile="work", remote="host:8765", key=None),