fix: bg-bg cards generating audio in separate directories

- Fix critical bug where generateAudioBgBg() was creating two separate
  card directories (one for front audio, one for back audio)

- Root cause: generateAudioWithVoiceAndFilename() calls findOrCreateWordDirectory()
  with both the front word AND the back word, creating separate directories

- Solution: Pass wordDir to both audio generation calls
  - Create new generateAudioWithVoiceAndFilenameInDir() function
  - Refactor generateAudioWithVoiceAndFilename() to use new function
  - generateAudioBgBg() now finds directory ONCE and passes it to both calls

This fixes the issue where opening a bg-bg card showed 'no audio loaded'
because audio_front.mp3 and audio_back.mp3 were in different directories.

1 files changed, 12 insertions, 5 deletions

diff --git a/internal/processor/processor.go b/internal/processor/processor.go
index 0947961..3b49cf0 100644
--- a/internal/processor/processor.go
+++ b/internal/processor/processor.go
@@ -271,15 +271,19 @@ func (p *Processor) generateAudioBgBg(front, back string) error {
 	}
 	fmt.Printf("  Using voice: %s\n", voice)
 
+	// Find or create the word directory ONCE (for the front word)
+	// Both audio files will be saved to this same directory
+	wordDir := p.findOrCreateWordDirectory(front)
+
 	// Generate front audio
 	fmt.Printf("  Generating front audio for '%s'...\n", front)
-	if err := p.generateAudioWithVoiceAndFilename(front, voice, "audio_front"); err != nil {
+	if err := p.generateAudioWithVoiceAndFilenameInDir(front, voice, "audio_front", wordDir); err != nil {
 		return fmt.Errorf("failed to generate front audio: %w", err)
 	}
 
 	// Generate back audio
 	fmt.Printf("  Generating back audio for '%s'...\n", back)
-	if err := p.generateAudioWithVoiceAndFilename(back, voice, "audio_back"); err != nil {
+	if err := p.generateAudioWithVoiceAndFilenameInDir(back, voice, "audio_back", wordDir); err != nil {
 		return fmt.Errorf("failed to generate back audio: %w", err)
 	}
 
@@ -293,6 +297,12 @@ func (p *Processor) generateAudioWithVoice(word, voice string) error {
 
 // generateAudioWithVoiceAndFilename generates audio for a word with a specific voice and filename
 func (p *Processor) generateAudioWithVoiceAndFilename(word, voice, filenameBase string) error {
+	wordDir := p.findOrCreateWordDirectory(word)
+	return p.generateAudioWithVoiceAndFilenameInDir(word, voice, filenameBase, wordDir)
+}
+
+// generateAudioWithVoiceAndFilenameInDir generates audio for a word and saves it to a specific directory
+func (p *Processor) generateAudioWithVoiceAndFilenameInDir(word, voice, filenameBase, wordDir string) error {
 	// Generate random speed between 0.90 and 1.00 if not explicitly set
 	speed := p.flags.OpenAISpeed
 	if p.flags.OpenAISpeed == 0.9 && !viper.IsSet("audio.openai_speed") {
@@ -334,9 +344,6 @@ func (p *Processor) generateAudioWithVoiceAndFilename(word, voice, filenameBase
 	// Generate audio file
 	ctx := context.Background()
 
-	// Find existing card directory or create new one
-	wordDir := p.findOrCreateWordDirectory(word)
-
 	// Build filename using the provided base
 	var outputFile string
 	if p.flags.AllVoices && filenameBase == "audio" {