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

bizinikiwi/client/basic-authorship/src/basic_authorship.rs

@@ -395,8 +395,9 @@ where
 
 		let mode = block_builder.extrinsic_inclusion_mode();
 		let end_reason = match mode {
-			ExtrinsicInclusionMode::AllExtrinsics =>
-				self.apply_extrinsics(&mut block_builder, deadline, block_size_limit).await?,
+			ExtrinsicInclusionMode::AllExtrinsics => {
+				self.apply_extrinsics(&mut block_builder, deadline, block_size_limit).await?
+			},
 			ExtrinsicInclusionMode::OnlyInherents => EndProposingReason::TransactionForbidden,
 		};
 		let (block, storage_changes, proof) = block_builder.build()?.into_inner();
@@ -1002,13 +1003,13 @@ mod tests {
 		.chain((1..extrinsics_num as u64).map(extrinsic))
 		.collect::<Vec<_>>();
 
-		let block_limit = genesis_header.encoded_size() +
-			extrinsics
+		let block_limit = genesis_header.encoded_size()
+			+ extrinsics
 				.iter()
 				.take(extrinsics_num - 1)
 				.map(Encode::encoded_size)
-				.sum::<usize>() +
-			Vec::<Extrinsic>::new().encoded_size();
+				.sum::<usize>()
+			+ Vec::<Extrinsic>::new().encoded_size();
 
 		block_on(txpool.submit_at(genesis_hash, SOURCE, extrinsics.clone())).unwrap();