style: apply rustfmt across all crates and demos

Consistent formatting pass: line wrapping, import sorting, trailing
whitespace removal, let-chain indentation, merged derive attributes,
and unsafe block reformatting.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

crates/training/rtx-transformers/src/losses/mod.rs

@@ -20,8 +20,7 @@ use crate::Result;
 use rtx_tensor::Tensor;
 
 /// Reduction modes for loss computation
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[derive(Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 pub enum Reduction {
     /// No reduction - return per-sample losses
     None,
@@ -32,7 +31,6 @@ pub enum Reduction {
     Sum,
 }
 
-
 /// Base trait for all loss functions
 pub trait Loss {
     /// Compute the forward pass of the loss