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/api/src/in_mem.rs

@@ -205,10 +205,10 @@ impl<Block: BlockT> Blockchain<Block> {
 		}
 		let this = self.storage.read();
 		let other = other.storage.read();
-		this.hashes == other.hashes &&
-			this.best_hash == other.best_hash &&
-			this.best_number == other.best_number &&
-			this.genesis_hash == other.genesis_hash
+		this.hashes == other.hashes
+			&& this.best_hash == other.best_hash
+			&& this.best_number == other.best_number
+			&& this.genesis_hash == other.genesis_hash
 	}
 
 	/// Insert header CHT root.

bizinikiwi/client/api/src/notifications/registry.rs

@@ -299,7 +299,7 @@ impl Registry {
 			None => {
 				wildcards.remove(&subscriber);
 			},
-			Some(filters) =>
+			Some(filters) => {
 				for key in filters.iter() {
 					let remove_key = match listeners.get_mut(key) {
 						Some(ref mut set) => {
@@ -312,7 +312,8 @@ impl Registry {
 					if remove_key {
 						listeners.remove(key);
 					}
-				},
+				}
+			},
 		}
 	}