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/network/availability-distribution/src/lib.rs

@@ -143,8 +143,9 @@ impl AvailabilityDistributionSubsystem {
 
 			// Handle task messages sending:
 			let message = match action {
-				Either::Left(subsystem_msg) =>
-					subsystem_msg.map_err(|e| FatalError::IncomingMessageChannel(e))?,
+				Either::Left(subsystem_msg) => {
+					subsystem_msg.map_err(|e| FatalError::IncomingMessageChannel(e))?
+				},
 				Either::Right(from_task) => {
 					let from_task = from_task.ok_or(FatalError::RequesterExhausted)?;
 					ctx.send_message(from_task).await;