fix: improve code formatting and module organization

- Corrected code formatting issues such as inconsistent line breaks and unnecessary trailing commas.
- Reorganized `mod.rs` to ensure proper order of module declarations.
- Fixed misplaced imports in `help.rs` and corrected the rendering method signature.
- Cleaned up unused code lines and moved `dummy` module declaration to its correct position.

harmony-rs/harmony_tui/src/widget/mod.rs

@@ -1,2 +1,2 @@
-pub mod score;
 pub mod help;
+pub mod score;