Initial tablet POC: project restructure + WebSocket/HTTP server + JS client

- Restructured project into /app, /server, /client with run.py entry point
- WSServer (QWebSocketServer) with log_signal, start/stop, client tracking
- HTTP server serves /client on port 8080
- Vanilla JS client: faders, toggles, transport, drag-to-arrange, lock/save layout
- Start Tablet button + floating Tablet log window in app UI
- Preset broadcast on load/switch, DAW state relay, hardware sync via widget_update
- Widget colors synced from app palette, toggle state fixed (sends 0/127 correctly)
- Layout saved per preset UUID back to presets.json

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

app/osc_sender.py

@@ -0,0 +1,37 @@
+from pythonosc import udp_client
+from osc_receiver import osc_receiver
+
+
+_osc_client = None
+_osc_send_port = 8000
+_osc_send_ip = "127.0.0.1"
+
+
+def get_osc_client():
+    global _osc_client
+
+    if _osc_client is None:
+        _osc_client = udp_client.SimpleUDPClient(_osc_send_ip, _osc_send_port)
+
+    return _osc_client
+
+
+def set_osc_target(ip=None, port=None):
+    global _osc_client, _osc_send_ip, _osc_send_port
+
+    if ip is not None:
+        _osc_send_ip = ip
+
+    if port is not None:
+        _osc_send_port = port
+
+    _osc_client = None
+
+
+def send_osc_message(address, value=1.0):
+    try:
+        get_osc_client().send_message(address, float(value))
+        osc_receiver.osc_out_signal.emit(address, str(value))
+        print(f"[OSC] → {address} {value}")
+    except Exception as e:
+        print(f"[OSC send] Error: {e}")