feat: update state path to muxplex, add MUXPLEX_STATE_DIR env var, add active_view field

- Change _default_state_dir from 'tmux-web' to 'muxplex'
- Update STATE_DIR to prefer MUXPLEX_STATE_DIR env var with TMUX_WEB_STATE_DIR fallback
- Add 'active_view': 'all' to empty_state() between active_remote_id and session_order
- Update module docstring schema to document active_view field
- Add tests: test_empty_state_has_active_view_key, test_empty_state_active_view_defaults_to_all, test_state_dir_uses_muxplex_name

muxplex/state.py

@@ -5,6 +5,8 @@ State schema (all values are plain JSON-serialisable dicts):
 
     {
         "active_session": str | None,
+        "active_remote_id": str | None,
+        "active_view": str,  # 'all' | 'hidden' | view name
         "session_order": list[str],
         "sessions": {
             "<name>": {
@@ -37,8 +39,12 @@ from pathlib import Path
 # Paths
 # ---------------------------------------------------------------------------
 
-_default_state_dir = Path.home() / ".local" / "share" / "tmux-web"
-STATE_DIR: Path = Path(os.environ.get("TMUX_WEB_STATE_DIR", _default_state_dir))
+_default_state_dir = Path.home() / ".local" / "share" / "muxplex"
+STATE_DIR: Path = Path(
+    os.environ.get(
+        "MUXPLEX_STATE_DIR", os.environ.get("TMUX_WEB_STATE_DIR", _default_state_dir)
+    )
+)
 STATE_PATH: Path = STATE_DIR / "state.json"
 
 # ---------------------------------------------------------------------------
@@ -60,6 +66,7 @@ def empty_state() -> dict:
     return {
         "active_session": None,
         "active_remote_id": None,
+        "active_view": "all",
         "session_order": [],
         "sessions": {},
         "devices": {},

muxplex/tests/test_state.py

@@ -92,6 +92,24 @@ def test_empty_state_returns_independent_dicts():
     assert s2["devices"] == {}
 
 
+def test_empty_state_has_active_view_key():
+    state = empty_state()
+    assert "active_view" in state
+
+
+def test_empty_state_active_view_defaults_to_all():
+    state = empty_state()
+    assert state["active_view"] == "all"
+
+
+def test_state_dir_uses_muxplex_name():
+    import muxplex.state as state_mod
+
+    path_str = str(state_mod._default_state_dir)
+    assert "muxplex" in path_str
+    assert "tmux-web" not in path_str
+
+
 # ---------------------------------------------------------------------------
 # empty_bell()
 # ---------------------------------------------------------------------------