ENH - allow movement while phone is open

Add Config.Phone.AllowMovement and route it through the central focus resolver. Keep camera and attention overlays authoritative over movement input, document the setting, and cover the focus-state combinations.

sky_phone/config/config.lua

@@ -16,6 +16,7 @@ Config.Command = "phone"
 Config.Phone = {
     Item = "phone",
     Unique = true, -- true: data follows each phone item; false: one persistent phone per character
+    AllowMovement = true, -- true: game input stays active while the mobile phone is open
     DevelopmentCommand = true,
     DeviceName = "iFruit Phone",
 }

sky_phone/source/client/focus.lua

@@ -16,6 +16,6 @@ function SkyPhoneFocus.Resolve(state)
             or state.payphone_focus
             or state.sim_picker_open
             or (state.camera_active and state.camera_nui_focused),
-        keep_input = false,
+        keep_input = state.is_open and state.allow_movement and not state.camera_active,
     }
 end

sky_phone/source/client/main.lua

@@ -292,6 +292,7 @@ end
 local function update_nui_focus()
     local focus = SkyPhoneFocus.Resolve({
         activity_suspended = activity_suspended,
+        allow_movement = Config.Phone.AllowMovement,
         call_focus = call_focus,
         camera_active = camera_active,
         camera_nui_focused = camera_nui_focused,