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/runtime_interface/host_function_interface.rs

@@ -467,14 +467,15 @@ fn generate_wasm_interface_signature_for_host_function(sig: &Signature) -> Resul
 /// Generate the variable name that stores the FFI value.
 fn generate_ffi_value_var_name(pat: &Pat) -> Result<Ident> {
 	match pat {
-		Pat::Ident(pat_ident) =>
+		Pat::Ident(pat_ident) => {
 			if let Some(by_ref) = pat_ident.by_ref {
 				Err(Error::new(by_ref.span(), "`ref` not supported!"))
 			} else if let Some(sub_pattern) = &pat_ident.subpat {
 				Err(Error::new(sub_pattern.0.span(), "Not supported!"))
 			} else {
 				Ok(Ident::new(&format!("{}_ffi_value", pat_ident.ident), Span::call_site()))
-			},
+			}
+		},
 		_ => Err(Error::new(pat.span(), "Not supported as variable name!")),
 	}
 }