feat: update workspace paths and enhance gitignore

- Updated stablediffusion crate path from "../stable-diffusion-burn" to "./crates/stable-diffusion-burn" for proper workspace resolution
- Enhanced .gitignore to include generated model files (.mpk, .pt, .bin, .safetensors, .ckpt) and user_data directory
- Added Cargo.lock to gitignore with appropriate comment
- Reorganized IDE files section in gitignore for better clarity
- Added newline at end of file for proper formatting

crates/stable-diffusion-burn/burn-crates/burn-backend-tests/tests/cubecl/gather.rs

@@ -0,0 +1,44 @@
+use super::*;
+use burn_tensor::Tolerance;
+use burn_tensor::{Distribution, Int, Shape, Tensor, backend::Backend};
+
+#[test]
+fn gather_should_work_with_multiple_workgroups_dim0() {
+    test_same_as_ref([6, 256], 0);
+}
+
+#[test]
+fn gather_should_work_with_multiple_workgroups_dim1() {
+    test_same_as_ref([6, 256], 1);
+}
+
+fn test_same_as_ref<const D: usize>(shape: [usize; D], dim: usize) {
+    let device = Default::default();
+    TestBackend::seed(&device, 0);
+
+    let max = shape[dim];
+    let shape = Shape::new(shape);
+    let tensor =
+        Tensor::<TestBackend, D>::random(shape.clone(), Distribution::Default, &Default::default());
+    let indices = Tensor::<TestBackend, 1, Int>::from_data(
+        Tensor::<TestBackend, 1>::random(
+            [shape.num_elements()],
+            Distribution::Uniform(0., max as f64),
+            &Default::default(),
+        )
+        .into_data(),
+        &Default::default(),
+    )
+    .reshape(shape);
+    let tensor_ref =
+        Tensor::<ReferenceBackend, D>::from_data(tensor.to_data(), &Default::default());
+    let indices_ref =
+        Tensor::<ReferenceBackend, D, Int>::from_data(indices.to_data(), &Default::default());
+
+    let actual = tensor.gather(dim, indices);
+    let expected = tensor_ref.gather(dim, indices_ref);
+
+    expected
+        .into_data()
+        .assert_approx_eq::<FloatElem>(&actual.into_data(), Tolerance::default());
+}