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/primitives/runtime-interface/proc-macro/src/utils.rs

@@ -128,8 +128,8 @@ impl RuntimeInterfaceFunctionSet {
 
 		self.versions
 			.insert(version.version, RuntimeInterfaceFunction::new(trait_item)?);
-		if self.latest_version_to_call.map_or(true, |v| v < version.version) &&
-			version.is_callable()
+		if self.latest_version_to_call.map_or(true, |v| v < version.version)
+			&& version.is_callable()
 		{
 			self.latest_version_to_call = Some(version.version);
 		}
@@ -360,9 +360,10 @@ pub fn host_inner_return_ty(ty: &syn::ReturnType) -> syn::ReturnType {
 	let crate_ = generate_crate_access();
 	match ty {
 		syn::ReturnType::Default => syn::ReturnType::Default,
-		syn::ReturnType::Type(ref arrow, ref ty) =>
+		syn::ReturnType::Type(ref arrow, ref ty) => {
 			syn::parse2::<syn::ReturnType>(quote! { #arrow <#ty as #crate_::RIType>::Inner })
-				.expect("parsing doesn't fail"),
+				.expect("parsing doesn't fail")
+		},
 	}
 }