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/src/proving_trie/mod.rs

@@ -107,8 +107,9 @@ impl From<TrieError> for &'static str {
 		match e {
 			TrieError::InvalidStateRoot => "The state root is not in the database.",
 			TrieError::IncompleteDatabase => "A trie item was not found in the database.",
-			TrieError::ValueAtIncompleteKey =>
-				"A value was found with a key that is not byte-aligned.",
+			TrieError::ValueAtIncompleteKey => {
+				"A value was found with a key that is not byte-aligned."
+			},
 			TrieError::DecoderError => "A corrupt trie item was encountered.",
 			TrieError::InvalidHash => "The hash does not match the expected value.",
 			TrieError::DuplicateKey => "The proof contains duplicate keys.",