fix: resolve emulator crash - thread safety and icon fallback

- NativeSearch: move onResult/onError callbacks outside withContext(Dispatchers.IO) to prevent CalledFromWrongThreadException
- SearchStrategy: change callback types to suspend to enable proper coroutine chaining
- SearchCoordinator: remove leaked CoroutineScope, rely on suspend callback chaining for fallback flow
- Resources: add mipmap-hdpi/mdpi/xhdpi/xxhdpi icon fallbacks for API < 26 devices

app/src/main/java/com/videoapp/tv/util/JsoupHelper.kt

@@ -0,0 +1,29 @@
+package com.videoapp.tv.util
+
+import com.videoapp.tv.data.SiteConfig
+import org.jsoup.Jsoup
+
+object JsoupHelper {
+    fun escapeCssSelector(selector: String): String {
+        return selector.replace("\"", "\\\"").replace("'", "\\'")
+    }
+
+    suspend fun testSelector(
+        url: String,
+        selector: String
+    ): List<String> = kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.IO) {
+        try {
+            val doc = Jsoup.connect(url).timeout(10000).get()
+            doc.select(selector).map { it.text().trim() }
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
+
+    fun buildSearchPostData(config: SiteConfig, keyword: String): Map<String, String> {
+        val data = mutableMapOf<String, String>()
+        data[config.keywordParam] = keyword
+        data.putAll(config.extraParams)
+        return data
+    }
+}

app/src/main/java/com/videoapp/tv/util/WebViewPool.kt

@@ -0,0 +1,25 @@
+package com.videoapp.tv.util
+
+import android.content.Context
+import android.webkit.WebView
+
+object WebViewPool {
+    private var sharedWebView: WebView? = null
+
+    fun get(context: Context): WebView {
+        return sharedWebView ?: createNew(context).also { sharedWebView = it }
+    }
+
+    private fun createNew(context: Context): WebView {
+        return WebView(context.applicationContext).apply {
+            settings.javaScriptEnabled = true
+            settings.domStorageEnabled = true
+            settings.mediaPlaybackRequiresUserGesture = false
+        }
+    }
+
+    fun release() {
+        sharedWebView?.destroy()
+        sharedWebView = null
+    }
+}