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

pezbridges/relays/finality/src/headers.rs

@@ -128,8 +128,9 @@ impl<P: FinalitySyncPipeline> JustifiedHeaderSelector<P> {
 	) -> Option<JustifiedHeader<P>> {
 		let (unjustified_headers, maybe_justified_header) = match self {
 			JustifiedHeaderSelector::Mandatory(justified_header) => return Some(justified_header),
-			JustifiedHeaderSelector::Regular(unjustified_headers, justified_header) =>
-				(unjustified_headers, Some(justified_header)),
+			JustifiedHeaderSelector::Regular(unjustified_headers, justified_header) => {
+				(unjustified_headers, Some(justified_header))
+			},
 			JustifiedHeaderSelector::None(unjustified_headers) => (unjustified_headers, None),
 		};
 
@@ -194,14 +195,15 @@ fn need_to_relay<P: FinalitySyncPipeline>(
 	match headers_to_relay {
 		HeadersToRelay::All => true,
 		HeadersToRelay::Mandatory => header.is_mandatory(),
-		HeadersToRelay::Free =>
-			header.is_mandatory() ||
-				free_headers_interval
+		HeadersToRelay::Free => {
+			header.is_mandatory()
+				|| free_headers_interval
 					.map(|free_headers_interval| {
-						header.number().saturating_sub(info.best_number_at_target) >=
-							free_headers_interval
+						header.number().saturating_sub(info.best_number_at_target)
+							>= free_headers_interval
 					})
-					.unwrap_or(false),
+					.unwrap_or(false)
+		},
 	}
 }