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/pezframe/support/procedural/src/no_bound/default.rs

@@ -138,13 +138,14 @@ pub fn derive_default_no_bound(input: proc_macro::TokenStream) -> proc_macro::To
 				},
 			}
 		},
-		Data::Union(union_) =>
+		Data::Union(union_) => {
 			return syn::Error::new_spanned(
 				union_.union_token,
 				"Union type not supported by `derive(DefaultNoBound)`",
 			)
 			.to_compile_error()
-			.into(),
+			.into()
+		},
 	};
 
 	quote!(