fix(game): restore one-shot magnetic fields

Replace the global timed magnet and drain teleport with the three recovered
field records. Map top targets 150-152 to center field 6 and outlane fields
153-154, apply upward pull only inside each registered rectangle, and deactivate
the field after it pulls the ball through its upper boundary.

Render each active field from its exact original active-table rectangle instead
of drawing invented yellow triangles.

Test Plan:
- `cargo test --all-targets` -- 48 passed
- `cargo clippy --all-targets -- -D warnings` -- passed
- production build plus Windows GNU and macOS checks -- passed
- live field-153 entry direction matched and Rust field lifecycle test passed
- `git diff --cached --check` -- passed

tdkpin-rs/src/app.rs

@@ -410,19 +410,22 @@ impl App {
             let index = usize::from(game.player().diamond_segments.min(9) - 1);
             draw_texture(&self.assets.diamond[index], 123.0, 298.0, WHITE);
         }
-        if game.magnets > 0.0 {
-            for x in [18.0, 296.0] {
-                draw_triangle(
-                    vec2(x, 345.0),
-                    vec2(x - 7.0, 359.0),
-                    vec2(x + 7.0, 359.0),
-                    YELLOW,
-                );
-                draw_triangle(
-                    vec2(x, 367.0),
-                    vec2(x - 7.0, 381.0),
-                    vec2(x + 7.0, 381.0),
-                    YELLOW,
+        for (object_id, region) in [
+            (6, Rect::new(151.0, 389.0, 13.0, 49.0)),
+            (153, Rect::new(11.0, 344.0, 13.0, 49.0)),
+            (154, Rect::new(291.0, 346.0, 13.0, 49.0)),
+        ] {
+            if game.magnetic_field_active(object_id) {
+                draw_texture_ex(
+                    &self.assets.active_table,
+                    region.x,
+                    region.y,
+                    WHITE,
+                    DrawTextureParams {
+                        dest_size: Some(vec2(region.w, region.h)),
+                        source: Some(region),
+                        ..Default::default()
+                    },
                 );
             }
         }