Expose the shell's remaining UI-only toggles over IPC

Every toggle you could only reach by mouse or panel hotkey is now
scriptable through omarchy-shell:

- omarchy.bluetooth toggleBluetooth — the radio (was right-click / B)
- omarchy.network toggleNetwork — Wi-Fi on/off (was W in the panel)
- omarchy.tailscale toggleTailscale — the connection as one call,
  matching the widget's right-click, instead of separate up/down
- omarchy.clock toggleWeekStart — calendar week start (was W)
- shell toggleBarTransparency — the bar background (was manage UI only)

Bluetooth and network follow the power/monitor pattern: manageIpc: false
so the panel owns the target's single IpcHandler and can extend it past
the inherited lifecycle methods.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shell/plugins/panels/network/Panel.qml

@@ -12,6 +12,9 @@ Panel {
   id: root
   moduleName: "omarchy.network"
   ipcTarget: "omarchy.network"
+  // manageIpc: false so this panel can own the single IpcHandler the target
+  // permits — needed for the toggleNetwork method below.
+  manageIpc: false
 
   // Centralized close so callers can't forget to drop the passphrase prompt.
   function close() {
@@ -214,6 +217,17 @@ Panel {
     Qt.callLater(function() { root.refresh(true) })
   }
 
+  IpcHandler {
+    target: "omarchy.network"
+
+    function open() { root.open() }
+    function close() { root.close() }
+    function show() { root.open() }
+    function hide() { root.close() }
+    function toggle() { root.toggle() }
+    function toggleNetwork() { root.toggleNetwork() }
+  }
+
   function activateHeader() {
     if (headerIndex === qrHeaderIndex) showWifiQr()
     else if (headerIndex === toggleHeaderIndex) toggleNetwork()