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

pezkuwi/runtime/common/src/claims/mod.rs

@@ -107,14 +107,16 @@ impl StatementKind {
 	/// Convert this to the (English) statement it represents.
 	fn to_text(self) -> &'static [u8] {
 		match self {
-			StatementKind::Regular =>
+			StatementKind::Regular => {
 				&b"I hereby agree to the terms of the statement whose SHA-256 multihash is \
 				Qmc1XYqT6S39WNp2UeiRUrZichUWUPpGEThDE6dAb3f6Ny. (This may be found at the URL: \
-				https://statement.polkadot.network/regular.html)"[..],
-			StatementKind::Saft =>
+				https://statement.polkadot.network/regular.html)"[..]
+			},
+			StatementKind::Saft => {
 				&b"I hereby agree to the terms of the statement whose SHA-256 multihash is \
 				QmXEkMahfhHJPzT3RjkXiZVFi77ZeVeuxtAjhojGRNYckz. (This may be found at the URL: \
-				https://statement.polkadot.network/saft.html)"[..],
+				https://statement.polkadot.network/saft.html)"[..]
+			},
 		}
 	}
 }