Live Editor: add DASP/Sox device connection with full CRUD and COV

Port the DASP transport and Sox protocol stack from sedonaOntrol Java
to Python, enabling live device editing alongside the existing offline
SAX editor. Lazy-loads components on navigation, caches them, and
subscribes to COV events for the active wiresheet.

New files: dasp.py, sox.py, device_session.py, connect_dialog.py,
live_hooks.py. Modified: app_state.py (live-mode state), main.py
(Device menu, COV polling, lazy tree expand), properties.py (Sox
write-through), sax_file.py (structural mutations route through
live_hooks), schema.py (find_manifest helper).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.072"
+VERSION = "0.0.0.074"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True
@@ -204,4 +204,17 @@ def mark_clean():
     refresh_dirty_display()
 
 
+# ── Live device connection state ────────────────────────────────
+live_mode = False
+device_session = None       # device_session.DeviceSession instance
+device_host = ""
+device_port = 1876
+connection_status = "offline"  # offline | connecting | connected | error
+
+
+def base_window_title_live():
+    """Window title for live mode."""
+    return f"Sedona Live Editor [v{VERSION}] — {device_host}:{device_port}"
+
+
 SEDONA_HOME, GRID_SIZE, ADD_TIMESTAMP, BOX_WIDTH, LEFT_PANE_WIDTH = load_preferences()