feat(hotspot): add Control Center shortcut to toggle hotspot

Closes #349 by exposing a cc-toggle shortcut entry that mirrors service
state and sends the existing hotspot_command toggle action.

hotspot/shortcut.luau

@@ -0,0 +1,35 @@
+--!nonstrict
+
+local COMMAND_KEY = "hotspot_command"
+
+local status = noctalia.state.get("hotspot_status") or {
+  active = false,
+  busy = false,
+  available = true,
+}
+
+local function sendCommand(action)
+  noctalia.state.set(COMMAND_KEY, { action = action })
+end
+
+local function render()
+  local active = status.active == true
+  shortcut.setLabel(if active then noctalia.tr("shortcut.active") else noctalia.tr("shortcut.inactive"))
+  shortcut.setIcon("router", "wifi-off")
+  shortcut.setActive(active)
+  shortcut.setEnabled(status.available ~= false and status.busy ~= true)
+end
+
+noctalia.state.watch("hotspot_status", function(value)
+  if type(value) == "table" then
+    status = value
+    render()
+  end
+end)
+
+render()
+
+function onClick()
+  if status.available == false or status.busy == true then return end
+  sendCommand("toggle")
+end