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/clamp.rs

@@ -0,0 +1,20 @@
+use super::*;
+use burn_tensor::Tolerance;
+use burn_tensor::{Distribution, Tensor};
+
+#[test]
+fn clamp_should_match_reference() {
+    let input = Tensor::<TestBackend, 4>::random(
+        [1, 5, 32, 32],
+        Distribution::Default,
+        &Default::default(),
+    );
+    let input_ref = Tensor::<ReferenceBackend, 4>::from_data(input.to_data(), &Default::default());
+
+    let output = input.clamp(0.3, 0.7);
+
+    output.into_data().assert_approx_eq::<FloatElem>(
+        &input_ref.clamp(0.3, 0.7).into_data(),
+        Tolerance::default(),
+    );
+}