Add Windows Chrome side panel and scoped IDE native bridge

tests/tui_gateway/test_chrome_viewer_fanout.py

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+"""The desktop and browser must see the same events, without duplicating replay."""
+from tui_gateway import event_replay, server
+
+
+class Viewer:
+    def __init__(self, fail=False):
+        self.frames = []
+        self.fail = fail
+
+    def write(self, frame):
+        if self.fail:
+            raise OSError("disconnected")
+        self.frames.append(frame)
+        return True
+
+
+def test_event_reaches_both_viewers_once_and_is_recorded_once(monkeypatch):
+    desktop, chrome = Viewer(), Viewer()
+    monkeypatch.setattr(server, "_sessions", {"browser-test": {
+        "transport": chrome, "viewers": {desktop: 1, chrome: 2},
+    }})
+    event_replay.reset_replay_state()
+    try:
+        frame = server._event_frame("message.delta", "browser-test", {"text": "İki yüzey"})
+        assert server.write_json(frame)
+        assert desktop.frames == chrome.frames == [frame]
+        assert event_replay.latest_seq("browser-test") == 1
+        assert len(event_replay.events_since("browser-test", 0)) == 1
+    finally:
+        event_replay.reset_replay_state()
+
+
+def test_closed_primary_does_not_hide_events_from_remaining_viewer(monkeypatch):
+    desktop, chrome = Viewer(), Viewer(fail=True)
+    monkeypatch.setattr(server, "_sessions", {"browser-test": {
+        "transport": chrome, "viewers": {desktop: 1, chrome: 2},
+    }})
+    event_replay.reset_replay_state()
+    try:
+        frame = server._event_frame("approval.request", "browser-test", {"request_id": "test"})
+        assert server.write_json(frame)
+        assert desktop.frames == [frame]
+    finally:
+        event_replay.reset_replay_state()