chore: clean unused weak self closure in onCommittedDelta

src/AppDelegate.swift

@@ -131,8 +131,7 @@ public final class AppDelegate: NSObject, NSApplicationDelegate {
         }
         
         // Handle streaming delta text (incremental committed words)
-        session.onCommittedDelta = { [weak self] delta in
-            guard let self = self else { return }
+        session.onCommittedDelta = { delta in
             // If it's an executive slash command, do NOT type it into the input box
             if SonioxSettings.shared.voiceCommands && VoiceCommandExecutor.shared.isSlashCommand(text: delta) {
                 return