fix(ImClient): make sendSync/scheduleReconnect safe when SDK not initialized

ImClient.sendSync() called getConfig() which throws when init() hasn't been
called, breaking headless usage (e.g. platform event listeners). Now wraps
the call in a try-catch and skips the sync frame if appKey is unavailable.
Same fix for scheduleReconnect's debug log.

Also: add vite-plugin-dts to generate TypeScript declarations on every build,
fixing the missing dist/index.d.ts that broke IDE type resolution. Bump to 0.2.3.

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@xuqm/vue3-sdk",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "description": "XuqmGroup Vue3 SDK — IM & platform integration for web",
   "private": false,
   "publishConfig": {
@@ -21,7 +21,7 @@
   ],
   "scripts": {
     "dev": "vite build --watch",
-    "build": "tsc --emitDeclarationOnly && vite build",
+    "build": "vite build",
     "type-check": "tsc --noEmit",
     "test": "vitest run",
     "test:watch": "vitest",

src/im/ImClient.ts

@@ -227,7 +227,8 @@ export class ImClient {
 
   private sendSync(): void {
     if (this.ws?.readyState !== WebSocket.OPEN) return
-    const config = getConfig()
+    const config = (() => { try { return getConfig() } catch { return null } })()
+    if (!config?.appKey) return
     this.ws.send(
       buildStompFrame(
         'SEND',
@@ -261,7 +262,8 @@ export class ImClient {
 
   private scheduleReconnect(): void {
     if (this.destroyed) return
-    if (getConfig().debug) {
+    const debug = (() => { try { return getConfig().debug } catch { return false } })()
+    if (debug) {
       console.log(`[ImClient] reconnect in ${this.reconnectDelay}ms`)
     }
     this.reconnectTimer = setTimeout(() => {

vite.config.ts

@@ -1,10 +1,12 @@
 import { defineConfig } from 'vite'
 import vue from '@vitejs/plugin-vue'
+import dts from 'vite-plugin-dts'
 import { resolve } from 'path'
 
 export default defineConfig({
   plugins: [
     vue(),
+    dts({ include: ['src'], insertTypesEntry: true }),
   ],
   build: {
     lib: {