Sell PRO as an in-app unlock, take shared photos, and let FX run negative

- One free Play app (com.locphamtran.recipescamera) with an expo-iap PRO
  unlock, replacing the paid apk for the store channel
- Android SEND/SEND_MULTIPLE share target feeds photos into the editor,
  on cold start and on resume
- BACK button in the TopBar and press-and-hold PEEK replace the chip row
- NOISE REDUCTION and SHARPENING accept -10: a negative SHARPENING softens
  the frame before the grain pass, a negative NOISE REDUCTION re-grains it,
  in the Skia engine, the live preview and the Kotlin export path alike

android/app/src/main/AndroidManifest.xml

@@ -27,6 +27,17 @@
         <action android:name="android.intent.action.MAIN"/>
         <category android:name="android.intent.category.LAUNCHER"/>
       </intent-filter>
+      <!-- Share target. Without this filter the app never appears in the
+           system share sheet at all; image/* only, the editor takes photos.
+           Goes on the launcher activity: it is singleTask, so a share
+           re-delivered there replaces its intent (onNewIntent -> setIntent)
+           and the running app picks the photo up without a cold start. -->
+      <intent-filter>
+        <action android:name="android.intent.action.SEND"/>
+        <action android:name="android.intent.action.SEND_MULTIPLE"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <data android:mimeType="image/*"/>
+      </intent-filter>
       <intent-filter>
         <action android:name="android.intent.action.VIEW"/>
         <category android:name="android.intent.category.DEFAULT"/>