Replace old Ditto splash icon with Agora double-bolt

The Android 12 splash vector (splash_icon_vector.xml) and the legacy
splash PNGs still showed the old Ditto cat / single-bolt logo. Replace
the splash vector with the current double-bolt glyph from logo.svg and
regenerate splash_icon.png and all port/land splash PNGs as the white
double-bolt on the dark splash background.

android/app/src/main/res/drawable/splash_icon_vector.xml

@@ -5,43 +5,26 @@
     android:viewportHeight="1200">
 
     <!--
-      Android 12 splash screen masks the icon to a circle at 2/3 of canvas (160dp of 240dp).
-      The Ditto logo SVG has viewBox="-5 -10 100 100".
-      We scale the 100x100 logo to fit ~800x800 in the center of 1200x1200,
-      leaving ~200px padding on each side for the circular safe zone.
-      Scale factor: 800/100 = 8. Translate: (200 + 5*8, 200 + 10*8) = (240, 280) to shift origin.
+      Agora double-bolt logo from public/logo.svg (viewBox "0 0 720 880").
+      Android 12 splash masks the icon to a circle at 2/3 of the canvas
+      (~800dp of 1200dp). The logo is 720x880 (portrait); scale 880 -> 800
+      (factor 800/880 = 0.9091) giving a scaled width of ~654, then center:
+        translateX = (1200 - 720*0.9091) / 2 ≈ 273
+        translateY = (1200 - 880*0.9091) / 2 = 200
     -->
 
     <group
-        android:translateX="240"
-        android:translateY="280"
-        android:scaleX="8"
-        android:scaleY="8">
+        android:translateX="273"
+        android:translateY="200"
+        android:scaleX="0.9091"
+        android:scaleY="0.9091">
 
-        <!-- path1: bottom arc / bottom-right swash -->
         <path
             android:fillColor="#FFFFFF"
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-
-        <!-- path2: small left accent dot/arc -->
+            android:pathData="M415.596 0L0 417.12L284.123 702.287L346.922 468.3H189.533L415.596 0Z" />
         <path
             android:fillColor="#FFFFFF"
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-
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-
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-
-        <!-- path5: top-right swash / outer arc with tail -->
-        <path
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     </group>