fix image preview and add option for automatically stop auto screenshoting when idle

platform/1.21.8/src/main/java/dev/photosync/platform/impl/GameAdapter.java

@@ -1,13 +1,16 @@
 package dev.photosync.platform.impl;
 
+import dev.photosync.core.capture.CameraPose;
 import dev.photosync.mcapi.GameContext;
 import lombok.extern.slf4j.Slf4j;
 import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.Util;
 import net.minecraft.client.Minecraft;
+import net.minecraft.world.entity.Entity;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.Optional;
 
 /** Ambient client state, the render thread, and the way out of the game. */
 @Slf4j
@@ -34,6 +37,20 @@ public final class GameAdapter implements GameContext {
         return Minecraft.getInstance().screen != null;
     }
 
+    /**
+     * The camera entity rather than the player, so that a spectator following
+     * someone else is judged on what the screenshot will actually show. It falls
+     * back to the player, and is null until one exists.
+     */
+    @Override
+    public Optional<CameraPose> cameraPose() {
+        Entity camera = Minecraft.getInstance().getCameraEntity();
+        return camera == null
+                ? Optional.empty()
+                : Optional.of(new CameraPose(camera.getX(), camera.getY(), camera.getZ(),
+                        camera.getYRot(), camera.getXRot()));
+    }
+
     @Override
     public Path configDirectory() {
         return configDirectory;