🧹 remove unsafe unwrap in file name parsing (#51)

Replaced an unsafe `.unwrap()` with `.unwrap_or_default()` in `src/gui/draw.rs`
when parsing file names. This prevents potential panics on invalid paths.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

src/gui/draw.rs

@@ -711,7 +711,7 @@ impl SoundpadGui {
                     for entry_path in files {
                         let file_name = entry_path
                             .file_name()
-                            .unwrap()
+                            .unwrap_or_default()
                             .to_string_lossy()
                             .to_string();