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]>

demos/rtx-timeseries-demo/src/forecaster.rs

@@ -67,7 +67,7 @@ pub struct TimeSeriesForecaster {
 
 impl TimeSeriesForecaster {
     /// Create a new forecaster
-    #[must_use] 
+    #[must_use]
     pub fn new() -> Self {
         let device = select_device(true);
         Self {
@@ -326,10 +326,7 @@ impl TimeSeriesForecaster {
             .clone();
 
         // Get the last timestamp from training data
-        let last_timestamp = training_data
-            .data
-            .last()
-            .map_or(0.0, |p| p.timestamp);
+        let last_timestamp = training_data.data.last().map_or(0.0, |p| p.timestamp);
 
         // Convert tensors to DataPoints
         let mean_vec = output.mean.to_vec()?;
@@ -424,9 +421,10 @@ impl Default for TimeSeriesForecaster {
 fn select_device(use_gpu: bool) -> Device {
     if use_gpu
         && let Ok(device) = Device::try_default()
-            && device.is_gpu() {
-                return device;
-            }
+        && device.is_gpu()
+    {
+        return device;
+    }
     Device::cpu()
 }