fix: finalize reviewed drawing and interaction paths

Reset stale geometry when automation replaces a drawing and resolve material paths from its directory. Cover precise indexed snapping, large-coordinate line intersections, leader ordering, invalid image buffers and browser clipboard fallback. Preserve Options dialog resizing.

Validation: cargo test --workspace --all-features (866 passed); wasm32 application check; Node clipboard regression check; Python binding tests (3 passed).

src/scene/pipeline/mesh_gpu.rs

@@ -2492,4 +2492,13 @@ mod texture_limit_tests {
         let rgba = vec![0u8; 10];
         assert!(downscale_rgba_to_limit(1000, 1000, &rgba, 512).is_none());
     }
+    #[test]
+    fn malformed_material_images_are_rejected_even_below_the_texture_limit() {
+        for (width, height, pixels) in [(0, 1, vec![]), (1, 0, vec![]), (1, 1, vec![0; 3]), (1, 1, vec![0; 5])] {
+            assert!(!super::valid_rgba_size(width, height, &pixels));
+            assert!(downscale_rgba_to_limit(width, height, &pixels, 16).is_none());
+        }
+        assert!(downscale_rgba_to_limit(1, 1, &[0; 4], 0).is_none());
+    }
+
 }

src/scene/selection.rs

@@ -1181,6 +1181,14 @@ mod tests {
             expanded.contains(&first) && expanded.contains(&second),
             "both leaders on one annotation must come back, not just one",
         );
+        for handle in [first, annotation, second] {
+            scene.deselect_all();
+            scene.select_entity(handle, false);
+            let expected = scene.selected_handles_in_order();
+            scene.deselect_all();
+            scene.select_entities(&[handle]);
+            assert_eq!(scene.selected_handles_in_order(), expected);
+        }
     }
 
     #[test]