POC: load icon app via ksu://icon/[packageName] (#674)

* manager: load app icons from package name using AppIconUti

Trying basic icon rendering from package via WebView ksu:// scheme.
Includes cache and bitmap scaling.
Still subject to refinement.

* Update WebUIActivity.kt

This proof-of-concept intercepts custom URLs of the form:
  ksu://icon/com.example.app

It fetches the app icon using PackageManager via AppIconUtil,
converts it to PNG, and returns it as a WebResourceResponse.

Used inside shouldInterceptRequest() for early experimentation
with dynamic WebView asset routing.

Fallbacks to WebViewAssetLoader for all other requests.

Notes:
- Icon size currently fixed at 512px
- No error icon or fallback image yet
- No caching headers or mime sniffing implemented

* POC: Handle ksu://icon/[packageName] to serve app icon via WebView

This proof-of-concept intercepts custom URLs of the form:
  ksu://icon/com.example.app

It fetches the app icon using PackageManager via AppIconUtil,
converts it to PNG, and returns it as a WebResourceResponse.

Used inside shouldInterceptRequest() for early experimentation
with dynamic WebView asset routing.

Fallbacks to WebViewAssetLoader for all other requests.

Notes:
- Icon size currently fixed at 512px
- No error icon or fallback image yet
- No caching headers or mime sniffing implemented

manager/app/src/main/java/com/rifsxd/ksunext/ui/webui/AppIconUtil.java

@@ -0,0 +1,46 @@
+package com.rifsxd.ksunext.ui.webui;
+
+import android.content.Context;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class AppIconUtil {
+    private static final Map<String, Bitmap> iconCache = new HashMap<>();
+
+    public static Bitmap loadAppIconSync(Context context, String packageName, int sizePx) {
+        Bitmap cached = iconCache.get(packageName);
+        if (cached != null) return cached;
+
+        try {
+            PackageManager pm = context.getPackageManager();
+            ApplicationInfo appInfo = pm.getApplicationInfo(packageName, 0);
+            Drawable drawable = pm.getApplicationIcon(appInfo);
+            Bitmap raw = drawableToBitmap(drawable, sizePx);
+            Bitmap icon = Bitmap.createScaledBitmap(raw, sizePx, sizePx, true);
+            iconCache.put(packageName, icon);
+            return icon;
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    private static Bitmap drawableToBitmap(Drawable drawable, int size) {
+        if (drawable instanceof BitmapDrawable) return ((BitmapDrawable) drawable).getBitmap();
+
+        int width = drawable.getIntrinsicWidth() > 0 ? drawable.getIntrinsicWidth() : size;
+        int height = drawable.getIntrinsicHeight() > 0 ? drawable.getIntrinsicHeight() : size;
+
+        Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bmp);
+        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
+        drawable.draw(canvas);
+        return bmp;
+    }
+}

manager/app/src/main/java/com/rifsxd/ksunext/ui/webui/WebUIActivity.kt

@@ -96,7 +96,23 @@ class WebUIActivity : ComponentActivity() {
                     view: WebView,
                     request: WebResourceRequest
                 ): WebResourceResponse? {
-                    return webViewAssetLoader.shouldInterceptRequest(request.url)
+                    val url = request.url
+                    
+                    //POC: Handle ksu://icon/[packageName] to serve app icon via WebView
+                    if (url.scheme.equals("ksu", ignoreCase = true) && url.host.equals("icon", ignoreCase = true)) {
+                        val packageName = url.path?.substring(1) 
+                        if (!packageName.isNullOrEmpty()) {
+                            val icon = AppIconUtil.loadAppIconSync(this@WebUIActivity, packageName, 512)
+                            if (icon != null) {
+                                val stream = java.io.ByteArrayOutputStream()
+                                icon.compress(android.graphics.Bitmap.CompressFormat.PNG, 100, stream)
+                                val inputStream = java.io.ByteArrayInputStream(stream.toByteArray())
+                                return WebResourceResponse("image/png", null, inputStream)
+                            }
+                        }
+                    }
+            
+                    return webViewAssetLoader.shouldInterceptRequest(url)
                 }
                 override fun onPageFinished(view: WebView?, url: String?) {
                     super.onPageFinished(view, url)
@@ -119,4 +135,4 @@ class WebUIActivity : ComponentActivity() {
         super.onDestroy()
         runCatching { rootShell?.close() }
     }
-}
+}