Multi-iPad dest_id routing, activity ring, context menu hide, live label/visibility sync

Desktop:
- Replace Remote checkbox with T: dest_spin (0=Off, 1-9=tablet) on all widgets
- dest_id persisted in get_state/set_state, broadcast in tablet snapshot
- dest_spin.valueChanged triggers save + broadcast to iPad
- _on_widget_visibility_from_tablet updates dest_spin from iPad hide event
- _broadcast_preset_update shared helper; ws_server.has_clients guard
- label editingFinished triggers live label sync to iPad

iOS:
- VC-Arrange/VC-Logging/Widgets-Reusable-UI file reorganisation
- ArrangeObjects/ArrangeView rename, 7-bucket Arrange-Functions split
- myTabletId (UserDefaults) + tabletIdField next to port in toolbar
- Preset filter: destId == myTabletId instead of visible bool
- BaseWidget activity ring: long press gesture (touch) + final update() flash
- Context menu long press (arrange mode): hide widget, save layout, send dest_id:0
- Same-UUID preset check skips Preset Switched alert on visibility/label updates
- autoSwitchEnabled, toolbarStatusLabel, presetLabel, statusToken

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

app/faderwidget.py

@@ -155,6 +155,15 @@ class FaderWidget(QWidget):
         self.pickup_checkbox.stateChanged.connect(self.on_pickup_changed)
         inner.addWidget(self.pickup_checkbox, alignment=Qt.AlignmentFlag.AlignHCenter)
 
+        # Remote checkbox
+        self.dest_spin = QSpinBox()
+        self.dest_spin.setRange(0, 9)
+        self.dest_spin.setSpecialValueText("Off")
+        self.dest_spin.setPrefix("T:")
+        self.dest_spin.setValue(1)
+        self.dest_spin.setFixedWidth(52)
+        inner.addWidget(self.dest_spin, alignment=Qt.AlignmentFlag.AlignHCenter)
+
         # Scribble strip
         self.title_edit = QLineEdit(label)
         self.title_edit.setAlignment(Qt.AlignmentFlag.AlignHCenter)
@@ -437,7 +446,8 @@ class FaderWidget(QWidget):
             "hw_channel": self.hw_channel,
             "zone": self.zone,
             "center_index": self.center_index,
-            "zone_index": self.zone_index
+            "zone_index": self.zone_index,
+            "dest_id": self.dest_spin.value(),
         }
 
     def set_state(self, state):
@@ -464,6 +474,9 @@ class FaderWidget(QWidget):
         self.zone_btn.set_state(self.zone == "left", self.zone == "right")
         self.hw_cc = state.get("hw_cc", None)
         self.hw_channel = state.get("hw_channel", None)
+        self.dest_spin.blockSignals(True)
+        self.dest_spin.setValue(state.get("dest_id", 1))
+        self.dest_spin.blockSignals(False)
         if self.hw_cc is not None:
             self.learn_btn.setText(f"HW: CC{self.hw_cc}")
             self.cc_input_lbl.setText(self._cc_input_label())