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_cli.py

@@ -4,7 +4,7 @@ import os
 import sys
 
 from click.testing import CliRunner
-from unittest.mock import patch
+from unittest.mock import call, patch
 
 from browser_cli.cli import main, _project_version
 from browser_cli.client import BrowserTarget
@@ -379,7 +379,8 @@ def test_tabs_list_with_remote_uses_only_remote_targets():
     result = CliRunner().invoke(main, ["--remote", "remote-host:8765", "tabs", "list"])
 
   assert result.exit_code == 0
-  assert "remote-host:work" in result.output
+  assert "work" in result.output
+  assert "remote-host:work" not in result.output
   assert "Remote" in result.output
   send_command.assert_called_once_with("tabs.list", {}, profile="work", remote="remote-host:8765", key=None)
 
@@ -400,6 +401,81 @@ def test_tabs_list_with_explicit_browser_does_not_show_browser_column():
   assert "Browser" not in result.output
   send_command.assert_called_once_with("tabs.list", {}, profile="work", remote=None, key=None)
 
+def test_tabs_tree_with_browser_host_alias_fans_out_to_remote_targets():
+  targets = [
+    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"),
+  ]
+
+  def fake_send_command(command, args=None, profile=None, remote=None, key=None):
+    assert remote == "browser-host.example:8765"
+    if command == "tabs.list":
+      return [{
+        "id": 1 if profile == "main" else 2,
+        "windowId": 1,
+        "active": True,
+        "index": 0,
+        "title": f"{profile} tab",
+        "url": "https://example.com",
+      }]
+    if command == "group.list":
+      return []
+    raise AssertionError(command)
+
+  with patch("browser_cli.remote_targets_for_alias", return_value=targets), patch(
+    "browser_cli.send_command", side_effect=fake_send_command
+  ) as send_command:
+    result = CliRunner().invoke(main, ["--browser", "browser-host.example", "tabs", "tree"])
+
+  assert result.exit_code == 0
+  assert "main" in result.output
+  assert "work" in result.output
+  assert "browser-host.example:main" not in result.output
+  assert "browser-host.example:work" not in result.output
+  assert "main tab" in result.output
+  assert "work tab" in result.output
+  assert send_command.call_args_list == [
+    call("tabs.list", {}, profile="main", remote="browser-host.example:8765", key=None),
+    call("tabs.list", {}, profile="work", remote="browser-host.example:8765", key=None),
+    call("group.list", {}, profile="main", remote="browser-host.example:8765", key=None),
+    call("group.list", {}, profile="work", remote="browser-host.example:8765", key=None),
+  ]
+
+def test_tabs_tree_unscoped_groups_remote_targets_by_host():
+  targets = [
+    BrowserTarget("main", "browser-host.example:main", "", remote="browser-host.example:8765", display_group="browser-host.example"),
+    BrowserTarget("work", "browser-host.example:work", "", remote="browser-host.example:8765", display_group="browser-host.example"),
+  ]
+
+  def fake_send_command(command, args=None, profile=None, remote=None, key=None):
+    assert remote == "browser-host.example:8765"
+    if command == "tabs.list":
+      return [{
+        "id": 1 if profile == "main" else 2,
+        "windowId": 1,
+        "active": True,
+        "index": 0,
+        "title": f"{profile} tab",
+        "url": "https://example.com",
+      }]
+    if command == "group.list":
+      return []
+    raise AssertionError(command)
+
+  with patch("browser_cli.active_browser_targets", return_value=targets), patch(
+    "browser_cli.send_command", side_effect=fake_send_command
+  ):
+    result = CliRunner().invoke(main, ["tabs", "tree"])
+
+  assert result.exit_code == 0
+  assert "browser-host.example" in result.output
+  assert "main" in result.output
+  assert "work" in result.output
+  assert "browser-host.example:main" not in result.output
+  assert "browser-host.example:work" not in result.output
+  assert "main tab" in result.output
+  assert "work tab" in result.output
+
 def test_tabs_count_multi_browser_shows_total():
   counts = {"default": 3, "work": 4}