fix(game): restore the original plunger launch

Start each ball at the recovered right-lane coordinates and charge the
plunger while Down is held, firing only on release. Render all eleven frames
of resource 901, preserve object 25 as the returning-ball catch, and use the
object table's center-contact extents without adding the art radius twice.

Test Plan:
- cargo fmt --all -- --check
- cargo test
- cargo clippy --all-targets --all-features -- -D warnings
- runtime smoke: start, hold Down, release, and inspect the right shooter lane

tdkpin-rs/src/assets.rs

@@ -12,7 +12,7 @@ pub struct Assets {
     pub diamond: [Texture2D; 9],
     pub wheel: Texture2D,
     pub robot: Texture2D,
-    pub magnet: Texture2D,
+    pub plunger: Texture2D,
     pub ball: Texture2D,
     pub digits: Texture2D,
     sounds: Vec<(u16, Sound)>,
@@ -50,7 +50,7 @@ impl Assets {
         ];
         let wheel = texture(include_bytes!("../assets/original/images/dat_00600.png"));
         let robot = texture(include_bytes!("../assets/original/images/dat_00900.png"));
-        let magnet = texture(include_bytes!("../assets/original/images/dat_00901.png"));
+        let plunger = texture(include_bytes!("../assets/original/images/dat_00901.png"));
         let ball = masked_texture(
             include_bytes!("../assets/original/images/bitmap_00101.png"),
             include_bytes!("../assets/original/images/bitmap_00102.png"),
@@ -140,7 +140,7 @@ impl Assets {
             diamond,
             wheel,
             robot,
-            magnet,
+            plunger,
             ball,
             digits,
             sounds,