style: Migrate to stable-only rustfmt configuration

- Remove nightly-only features from .rustfmt.toml and vendor/ss58-registry/rustfmt.toml
- Removed features: imports_granularity, wrap_comments, comment_width,
  reorder_impl_items, spaces_around_ranges, binop_separator,
  match_arm_blocks, trailing_semicolon, trailing_comma
- Format all 898 affected files with stable rustfmt
- Ensures long-term reliability without nightly toolchain dependency

pezkuwi/node/collation-generation/src/lib.rs

@@ -551,7 +551,10 @@ async fn construct_and_distribute_receipt(
 		// As such, honest collators never produce an uncompressed PoV which starts with
 		// a compression magic number, which would lead validators to reject the collation.
 		if encoded_size > validation_data.max_pov_size as usize {
-			return Err(Error::POVSizeExceeded(encoded_size, validation_data.max_pov_size as usize));
+			return Err(Error::POVSizeExceeded(
+				encoded_size,
+				validation_data.max_pov_size as usize,
+			));
 		}
 
 		pov