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/consensus/grandpa/src/justification.rs

@@ -214,12 +214,14 @@ impl<Block: BlockT> GrandpaJustification<Block> {
 				&mut buf,
 			);
 			match signature_result {
-				pezsp_consensus_grandpa::SignatureResult::Invalid =>
+				pezsp_consensus_grandpa::SignatureResult::Invalid => {
 					return Err(ClientError::BadJustification(
 						"invalid signature for precommit in grandpa justification".to_string(),
-					)),
-				pezsp_consensus_grandpa::SignatureResult::OutdatedSet =>
-					return Err(ClientError::OutdatedJustification),
+					))
+				},
+				pezsp_consensus_grandpa::SignatureResult::OutdatedSet => {
+					return Err(ClientError::OutdatedJustification)
+				},
 				pezsp_consensus_grandpa::SignatureResult::Valid => {},
 			}
 
@@ -236,10 +238,11 @@ impl<Block: BlockT> GrandpaJustification<Block> {
 						visited_hashes.insert(hash);
 					}
 				},
-				_ =>
+				_ => {
 					return Err(ClientError::BadJustification(
 						"invalid precommit ancestry proof in grandpa justification".to_string(),
-					)),
+					))
+				},
 			}
 		}