fix(samples): await Native.* calls + drop broken svelteLogo reference

Sample-side bugs that surfaced once the merge brought main's plugin
chain in. Pre-existing in v2-new-samples, not caused by the merge:

1. Missing await on Native.method() — Comlink wraps the embind module
   when it runs inside a worker (mt mode for the vite/webpack plugins,
   and effectively for nuxt/next even in st because they instantiate
   in a deferred context). All proxy calls return Promises, so the
   v2-new-samples authoring pattern of `setMessage(Native.sample())`
   rendered "[object Promise]" instead of the result.
   Fixed in:
     svelte-vite-mt/src/App.svelte
     react-vite-mt/src/App.jsx
     nuxt-vite/app/example.vue
     nuxt-vite-mt/app/example.vue
     next-webpack-mt/app/page.tsx
     remix-vite/app/welcome/welcome.tsx

2. svelte-vite-mt/src/App.svelte referenced an undefined `svelteLogo`
   binding (the import was missing and there's no svelte logo asset
   in the package). Removed the <div class="logo">…</div> block —
   it caused the whole component to render blank in Svelte 5.

For mt samples the thread-result poll also moved into setTimeout's
async callback so getThreadResult() actually completes before being
assigned (previously it raced runOnThread()).

Verified end-to-end: every listed sample renders the matrix result
in the browser.

Author: erenkucuker

cppjs-samples/cppjs-sample-web-next-webpack-multithread/app/page.tsx

@@ -13,16 +13,18 @@ export default function Home() {
         wasm: '/cpp.wasm',
         js: '/cpp.js',
       }
-    }).then(() => {
+    }).then(async () => {
       // AllSymbols contains all exported symbols after initialization
       console.log('AllSymbols:', AllSymbols);
       console.log('AllSymbols.Native:', AllSymbols.Native);
 
       if (AllSymbols.Native) {
-        const result = AllSymbols.Native.sample();
+        const result = await AllSymbols.Native.sample();
         setMessage(result);
-        AllSymbols.Native.runOnThread();
-        setThreadResult(AllSymbols.Native.getThreadResult());
+        await AllSymbols.Native.runOnThread();
+        setTimeout(async () => {
+          setThreadResult(await AllSymbols.Native.getThreadResult());
+        }, 1000);
       } else {
         setMessage('Native class not found in AllSymbols');
       }

cppjs-samples/cppjs-sample-web-nuxt-vite-multithread/app/example.vue

@@ -12,10 +12,12 @@ onMounted(async () => {
   try {
     await initCppJs()
     console.log('initCppJs completed, Native:', Native)
-    message.value = Native.sample()
+    message.value = await Native.sample()
     console.log('Result:', message.value)
-    Native.runOnThread()
-    threadResult.value = Native.getThreadResult()
+    await Native.runOnThread()
+    setTimeout(async () => {
+      threadResult.value = await Native.getThreadResult()
+    }, 1000)
   } catch (e) {
     console.error('Error in initCppJs:', e)
     message.value = 'Error: ' + e.message

cppjs-samples/cppjs-sample-web-nuxt-vite/app/example.vue

@@ -11,7 +11,7 @@ onMounted(async () => {
   try {
     await initCppJs()
     console.log('initCppJs completed, Native:', Native)
-    message.value = Native.sample()
+    message.value = await Native.sample()
     console.log('Result:', message.value)
   } catch (e) {
     console.error('Error in initCppJs:', e)

cppjs-samples/cppjs-sample-web-react-vite-multithread/src/App.jsx

@@ -7,15 +7,15 @@ function App() {
   const [threadResult, setThreadResult] = useState('...')
 
   useEffect(() => {
-    initCppJs().then(() => {
-        setStandardResult(Native.sample());
-        
+    initCppJs().then(async () => {
+        setStandardResult(await Native.sample());
+
         // Run computation on a separate thread
-        Native.runOnThread();
-        
+        await Native.runOnThread();
+
         // Poll for thread result after a short delay
-        setTimeout(() => {
-            setThreadResult(Native.getThreadResult());
+        setTimeout(async () => {
+            setThreadResult(await Native.getThreadResult());
         }, 1000);
     });
   }, []);

cppjs-samples/cppjs-sample-web-remix-vite/app/welcome/welcome.tsx

@@ -7,8 +7,8 @@ export function Welcome() {
   const [message, setMessage] = useState('compiling ...')
 
   useEffect(() => {
-    initCppJs().then(() => {
-        setMessage(Native.sample());
+    initCppJs().then(async () => {
+        setMessage(await Native.sample());
     });
   }, []);
   return (

cppjs-samples/cppjs-sample-web-svelte-vite-multithread/src/App.svelte

@@ -4,23 +4,20 @@
     let standardResult = $state('compiling ...');
     let threadResult = $state('...');
 
-    initCppJs().then(() => {
-        standardResult = Native.sample();
-        
+    initCppJs().then(async () => {
+        standardResult = await Native.sample();
+
         // Run computation on a separate thread
-        Native.runOnThread();
-        
+        await Native.runOnThread();
+
         // Poll for thread result after a short delay
-        setTimeout(() => {
-            threadResult = Native.getThreadResult();
+        setTimeout(async () => {
+            threadResult = await Native.getThreadResult();
         }, 1000);
     });
 </script>
 
 <main>
-  <div class="logo">
-    <img src={svelteLogo} alt="Svelte Logo" />
-  </div>
   <p>Matrix multiplier with c++</p>
   <br />
   <p>Standard Result &nbsp;&nbsp;:&nbsp;&nbsp; {standardResult}</p>