Centralize hallucination filter

VoiceInk/Services/AudioFileTranscriptionService.swift

@@ -60,6 +60,7 @@ class AudioTranscriptionService: ObservableObject {
             }
             
             let transcriptionDuration = Date().timeIntervalSince(transcriptionStart)
+            text = WhisperHallucinationFilter.filter(text)
             text = text.trimmingCharacters(in: .whitespacesAndNewlines)
             
             // Apply word replacements if enabled

VoiceInk/Services/ParakeetTranscriptionService.swift

@@ -144,9 +144,6 @@ class ParakeetTranscriptionService: TranscriptionService {
             text = WhisperTextFormatter.format(text)
         }
         
-        // Apply hallucination and filler word filtering
-        text = WhisperHallucinationFilter.filter(text)
-        
         return text
     }
 

VoiceInk/Whisper/LibWhisper.swift

@@ -107,8 +107,7 @@ actor WhisperContext {
         for i in 0..<whisper_full_n_segments(context) {
             transcription += String(cString: whisper_full_get_segment_text(context, i))
         }
-        let filteredTranscription = WhisperHallucinationFilter.filter(transcription)
-        return filteredTranscription
+        return transcription
     }
 
     static func createContext(path: String) async throws -> WhisperContext {

VoiceInk/Whisper/WhisperState.swift

@@ -268,6 +268,7 @@ class WhisperState: NSObject, ObservableObject {
 
             let transcriptionStart = Date()
             var text = try await transcriptionService.transcribe(audioURL: url, model: model)
+            text = WhisperHallucinationFilter.filter(text)
             let transcriptionDuration = Date().timeIntervalSince(transcriptionStart)
             
             if await checkCancellationAndCleanup() { return }