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/client/keystore/src/lib.rs

@@ -64,8 +64,9 @@ impl From<Error> for TraitError {
 	fn from(error: Error) -> Self {
 		match error {
 			Error::KeyNotSupported(id) => TraitError::KeyNotSupported(id),
-			Error::InvalidSeed | Error::InvalidPhrase | Error::PublicKeyMismatch =>
-				TraitError::ValidationError(error.to_string()),
+			Error::InvalidSeed | Error::InvalidPhrase | Error::PublicKeyMismatch => {
+				TraitError::ValidationError(error.to_string())
+			},
 			Error::Unavailable => TraitError::Unavailable,
 			Error::Io(e) => TraitError::Other(e.to_string()),
 			Error::Json(e) => TraitError::Other(e.to_string()),