fix: file type handling on Enter - extensions checked before executable bit

- Reorder Category() to check known extensions (text, config, image,
  pdf, audio, video, archive) before the executable bit check.
  Fixes video/audio/image files with executable bit being opened in
  editor instead of system default application.
- Remove 'executable' from isEditableEntry() - executables are now
  launched via handleExecute() instead of opened in Neovim.
- Add handleExecute() method that runs executable files in the
  terminal via tea.ExecProcess.
- Update handleOpenSelected() to route: text/config -> editor,
  executable -> launch, everything else -> system default (xdg-open).
- Bump version to v0.2.1

internal/fs/entry.go

@@ -116,14 +116,14 @@ func (e Entry) Category() string {
 		return "parent"
 	case e.IsDir:
 		return "directory"
-	case e.IsExecutable():
-		return "executable"
 	case hasExt(configExtensions, e.Extension):
 		return "config"
-	case hasExt(imageExtensions, e.Extension):
-		return "image"
 	case hasExt(textExtensions, e.Extension):
 		return "text"
+	case hasExt(textFilenames, strings.ToLower(e.Name)):
+		return "text"
+	case hasExt(imageExtensions, e.Extension):
+		return "image"
 	case hasExt(pdfExtensions, e.Extension):
 		return "pdf"
 	case hasExt(audioExtensions, e.Extension):
@@ -132,8 +132,8 @@ func (e Entry) Category() string {
 		return "video"
 	case hasExt(archiveExtensions, e.Extension):
 		return "archive"
-	case hasExt(textFilenames, strings.ToLower(e.Name)):
-		return "text"
+	case e.IsExecutable():
+		return "executable"
 	default:
 		return "binary"
 	}