feat: upgrade buttplug package to protocol v4 and WASM v10

Upgrade the buttplug TypeScript client from class-based v3 protocol to
interface-based v4 protocol, and the Rust/WASM server from the monolithic
buttplug 9.0.9 crate to the split buttplug_core/buttplug_server/
buttplug_server_device_config 10.0.0 crates.

TypeScript changes:
- Messages are now plain interfaces with msgId()/setMsgId() helpers
- ActuatorType → OutputType, SensorType → InputType
- ScalarCmd/RotateCmd/LinearCmd → OutputCmd, SensorReadCmd → InputCmd
- Client.ts → ButtplugClient.ts, new DeviceCommand/DeviceFeature files
- Devices getter returns Map instead of array
- Removed class-transformer/reflect-metadata dependencies

Rust/WASM changes:
- Split imports across buttplug_core, buttplug_server, buttplug_server_device_config
- Removed ButtplugServerDowngradeWrapper (use ButtplugServer directly)
- Replaced ButtplugFuture/ButtplugFutureStateShared with tokio::sync::oneshot
- Updated Hardware::new for new 6-arg signature
- Uses git fork (valknarthing/buttplug) to fix missing wasm deps in buttplug_core

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

packages/frontend/src/lib/components/device-card/device-card.svelte

@@ -5,7 +5,6 @@ import { Label } from "$lib/components/ui/label";
 import { Card, CardContent, CardHeader } from "$lib/components/ui/card";
 import type { BluetoothDevice } from "$lib/types";
 import { _ } from "svelte-i18n";
-import { ActuatorType } from "@sexy.pivoine.art/buttplug";
 
 interface Props {
 	device: BluetoothDevice;
@@ -16,7 +15,7 @@ interface Props {
 let { device, onChange, onStop }: Props = $props();
 
 function getBatteryColor(level: number) {
-	if (!device.info.hasBattery) {
+	if (!device.hasBattery) {
 		return "text-gray-400";
 	}
 	if (level > 60) return "text-green-400";
@@ -25,7 +24,7 @@ function getBatteryColor(level: number) {
 }
 
 function getBatteryBgColor(level: number) {
-	if (!device.info.hasBattery) {
+	if (!device.hasBattery) {
 		return "bg-gray-400/20";
 	}
 	if (level > 60) return "bg-green-400/20";
@@ -34,17 +33,13 @@ function getBatteryBgColor(level: number) {
 }
 
 function getScalarAnimations() {
-	const cmds: [{ ActuatorType: typeof ActuatorType }] =
-		device.info.messageAttributes.ScalarCmd;
-	return cmds
-		.filter((_, i: number) => !!device.actuatorValues[i])
-		.map(({ ActuatorType }) => `animate-${ActuatorType.toLowerCase()}`);
+	return device.actuators
+		.filter((a) => a.value > 0)
+		.map((a) => `animate-${a.outputType.toLowerCase()}`);
 }
 
 function isActive() {
-	const cmds: [{ ActuatorType: typeof ActuatorType }] =
-		device.info.messageAttributes.ScalarCmd;
-	return cmds.some((_, i: number) => !!device.actuatorValues[i]);
+	return device.actuators.some((a) => a.value > 0);
 }
 </script>
 
@@ -119,7 +114,7 @@ function isActive() {
                     ></span>
                     <span class="text-sm text-muted-foreground">{$_("device_card.battery")}</span>
                 </div>
-                {#if device.info.hasBattery}
+                {#if device.hasBattery}
                 <span class="text-sm font-medium {getBatteryColor(device.batteryLevel)}">
                     {device.batteryLevel}%
                 </span>
@@ -144,19 +139,19 @@ function isActive() {
     </div> -->
 
         <!-- Action Button -->
-        {#each device.info.messageAttributes.ScalarCmd as scalarCmd}
+        {#each device.actuators as actuator, idx}
             <div class="space-y-2">
-                <Label for={`device-${device.info.index}-${scalarCmd.Index}`}
+                <Label for={`device-${device.info.index}-${actuator.featureIndex}-${actuator.outputType}`}
                     >{$_(
-                        `device_card.actuator_types.${scalarCmd.ActuatorType.toLowerCase()}`,
+                        `device_card.actuator_types.${actuator.outputType.toLowerCase()}`,
                     )}</Label
                 >
                 <Slider
-                    id={`device-${device.info.index}-${scalarCmd.Index}`}
+                    id={`device-${device.info.index}-${actuator.featureIndex}-${actuator.outputType}`}
                     type="single"
-                    value={device.actuatorValues[scalarCmd.Index]}
-                    onValueChange={(val) => onChange(scalarCmd.Index, val)}
-                    max={scalarCmd.StepCount}
+                    value={actuator.value}
+                    onValueChange={(val) => onChange(idx, val)}
+                    max={actuator.maxSteps}
                     step={1}
                 />
             </div>

packages/frontend/src/lib/types.ts

@@ -108,12 +108,20 @@ export interface Stats {
 	viewers_count: number;
 }
 
+export interface DeviceActuator {
+	featureIndex: number;
+	outputType: string;
+	maxSteps: number;
+	descriptor: string;
+	value: number;
+}
+
 export interface BluetoothDevice {
 	id: string;
 	name: string;
-	actuatorValues: number[];
-	sensorValues: number[];
+	actuators: DeviceActuator[];
 	batteryLevel: number;
+	hasBattery: boolean;
 	isConnected: boolean;
 	lastSeen: Date;
 	info: ButtplugClientDevice;