feat: add Fyne GUI mode with interactive flashcard management

- Add --gui flag to launch interactive GUI mode
- Implement word navigation with prev/next buttons through existing cards
- Add delete functionality to remove unwanted flashcards
- Add fine-grained regeneration (image-only, audio-only, or both)
- Implement audio playback using mpg123 on Linux
- Auto-load first word on startup if cards exist
- Save translation files for navigation persistence
- Use DALL-E 2 with 512x512 images (half size)
- Update audio speed to 0.9 (from 0.8)
- Add comprehensive GUI documentation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

6 files changed, 1296 insertions, 1 deletions

diff --git a/internal/audio/provider.go b/internal/audio/provider.go
index 3508121..fd47ef4 100644
--- a/internal/audio/provider.go
+++ b/internal/audio/provider.go
@@ -43,7 +43,7 @@ func DefaultProviderConfig() *Config {
 		OutputFormat:    "mp3",
 		OpenAIModel:       "gpt-4o-mini-tts", // New model with voice instructions support
 		OpenAIVoice:       "nova",
-		OpenAISpeed:       0.8, // Slightly slower for clarity (note: may be ignored by gpt-4o-mini-tts)
+		OpenAISpeed:       0.9, // Slightly slower for clarity (note: may be ignored by gpt-4o-mini-tts)
 		OpenAIInstruction: "You are speaking Bulgarian language (български език). Pronounce the Bulgarian text with authentic Bulgarian phonetics, not Russian. Speak slowly and clearly for language learners.",
 		EnableCache:     true,
 		CacheDir:        "./.audio_cache",
diff --git a/internal/gui/app.go b/internal/gui/app.go
new file mode 100644
index 0000000..73dcd37
--- /dev/null
+++ b/internal/gui/app.go
@@ -0,0 +1,539 @@
+package gui
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/dialog"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/storage"
+	"fyne.io/fyne/v2/widget"
+	
+	"codeberg.org/snonux/totalrecall/internal/anki"
+	"codeberg.org/snonux/totalrecall/internal/audio"
+)
+
+// Application represents the main GUI application
+type Application struct {
+	// Fyne components
+	app    fyne.App
+	window fyne.Window
+	
+	// UI elements
+	wordInput       *widget.Entry
+	submitButton    *widget.Button
+	imageDisplay    *ImageDisplay
+	audioPlayer     *AudioPlayer
+	translationText *widget.Label
+	progressBar     *widget.ProgressBar
+	statusLabel     *widget.Label
+	
+	// Navigation buttons
+	prevWordBtn     *widget.Button
+	nextWordBtn     *widget.Button
+	
+	// Action buttons
+	keepButton         *widget.Button
+	regenerateImageBtn *widget.Button
+	regenerateAudioBtn *widget.Button
+	regenerateAllBtn   *widget.Button
+	deleteButton       *widget.Button
+	
+	// State management
+	currentWord      string
+	currentAudioFile string
+	currentImages    []string
+	currentTranslation string
+	savedCards       []anki.Card
+	existingWords    []string  // Words already in anki_cards folder
+	currentWordIndex int
+	
+	// Configuration
+	config      *Config
+	audioConfig *audio.Config
+	
+	// Background processing
+	ctx    context.Context
+	cancel context.CancelFunc
+	wg     sync.WaitGroup
+	mu     sync.Mutex
+}
+
+// Config holds GUI application configuration
+type Config struct {
+	OutputDir      string
+	AudioFormat    string
+	ImageProvider  string
+	ImagesPerWord  int
+	EnableCache    bool
+	OpenAIKey      string
+	PixabayKey     string
+	UnsplashKey    string
+}
+
+// DefaultConfig returns default GUI configuration
+func DefaultConfig() *Config {
+	return &Config{
+		OutputDir:      "./anki_cards",
+		AudioFormat:    "mp3",
+		ImageProvider:  "openai",
+		ImagesPerWord:  1,
+		EnableCache:    true,
+	}
+}
+
+// New creates a new GUI application
+func New(config *Config) *Application {
+	if config == nil {
+		config = DefaultConfig()
+	}
+	
+	// Ensure output directory exists
+	os.MkdirAll(config.OutputDir, 0755)
+	
+	ctx, cancel := context.WithCancel(context.Background())
+	
+	app := &Application{
+		app:    app.New(),
+		config: config,
+		ctx:    ctx,
+		cancel: cancel,
+		savedCards: make([]anki.Card, 0),
+	}
+	
+	// Set up audio configuration
+	app.audioConfig = &audio.Config{
+		Provider:          "openai",
+		OutputDir:         config.OutputDir,
+		OutputFormat:      config.AudioFormat,
+		OpenAIKey:         config.OpenAIKey,
+		OpenAIModel:       "gpt-4o-mini-tts",
+		OpenAIVoice:       "nova",
+		OpenAISpeed:       0.9,
+		OpenAIInstruction: "You are speaking Bulgarian language (български език). Pronounce the Bulgarian text with authentic Bulgarian phonetics, not Russian. Speak slowly and clearly for language learners.",
+		EnableCache:       config.EnableCache,
+		CacheDir:          "./.audio_cache",
+	}
+	
+	app.setupUI()
+	
+	// Scan existing words in output directory
+	app.scanExistingWords()
+	
+	return app
+}
+
+// setupUI creates the main user interface
+func (a *Application) setupUI() {
+	a.window = a.app.NewWindow("TotalRecall - Bulgarian Flashcard Generator")
+	a.window.Resize(fyne.NewSize(800, 600))
+	
+	// Create input section with navigation
+	a.wordInput = widget.NewEntry()
+	a.wordInput.SetPlaceHolder("Enter Bulgarian word...")
+	a.wordInput.OnSubmitted = func(string) { a.onSubmit() }
+	
+	a.submitButton = widget.NewButton("Generate", a.onSubmit)
+	a.prevWordBtn = widget.NewButton("◀ Prev", a.onPrevWord)
+	a.nextWordBtn = widget.NewButton("Next ▶", a.onNextWord)
+	
+	inputSection := container.NewBorder(
+		nil, nil, 
+		a.prevWordBtn,
+		container.NewHBox(a.submitButton, a.nextWordBtn),
+		a.wordInput,
+	)
+	
+	// Create display section
+	a.imageDisplay = NewImageDisplay()
+	a.audioPlayer = NewAudioPlayer()
+	a.translationText = widget.NewLabel("")
+	a.translationText.Alignment = fyne.TextAlignCenter
+	
+	displaySection := container.NewBorder(
+		a.translationText,
+		a.audioPlayer,
+		nil, nil,
+		a.imageDisplay,
+	)
+	
+	// Create action buttons
+	a.keepButton = widget.NewButton("Keep & Continue", a.onKeepAndContinue)
+	a.regenerateImageBtn = widget.NewButton("Regenerate Image", a.onRegenerateImage)
+	a.regenerateAudioBtn = widget.NewButton("Regenerate Audio", a.onRegenerateAudio)
+	a.regenerateAllBtn = widget.NewButton("Regenerate All", a.onRegenerateAll)
+	a.deleteButton = widget.NewButton("Delete", a.onDelete)
+	a.deleteButton.Importance = widget.DangerImportance
+	
+	// Initially disable action buttons
+	a.setActionButtonsEnabled(false)
+	
+	actionSection := container.NewHBox(
+		a.keepButton,
+		layout.NewSpacer(),
+		a.deleteButton,
+		widget.NewSeparator(),
+		a.regenerateImageBtn,
+		a.regenerateAudioBtn,
+		a.regenerateAllBtn,
+	)
+	
+	// Create status section
+	a.progressBar = widget.NewProgressBar()
+	a.progressBar.Hide()
+	a.statusLabel = widget.NewLabel("Ready")
+	
+	statusSection := container.NewBorder(
+		nil, nil, nil, nil,
+		container.NewVBox(
+			a.progressBar,
+			a.statusLabel,
+		),
+	)
+	
+	// Create menu
+	fileMenu := fyne.NewMenu("File",
+		fyne.NewMenuItem("Export to Anki...", a.onExportToAnki),
+		fyne.NewMenuItemSeparator(),
+		fyne.NewMenuItem("Preferences...", a.onPreferences),
+		fyne.NewMenuItemSeparator(),
+		fyne.NewMenuItem("Quit", a.app.Quit),
+	)
+	
+	mainMenu := fyne.NewMainMenu(fileMenu)
+	a.window.SetMainMenu(mainMenu)
+	
+	// Combine all sections
+	content := container.NewBorder(
+		inputSection,
+		container.NewVBox(
+			widget.NewSeparator(),
+			actionSection,
+			widget.NewSeparator(),
+			statusSection,
+		),
+		nil, nil,
+		displaySection,
+	)
+	
+	a.window.SetContent(content)
+	a.window.SetOnClosed(func() {
+		a.cancel()
+		a.wg.Wait()
+	})
+}
+
+// Run starts the GUI application
+func (a *Application) Run() {
+	a.window.ShowAndRun()
+}
+
+// onSubmit handles word submission
+func (a *Application) onSubmit() {
+	word := a.wordInput.Text
+	if word == "" {
+		return
+	}
+	
+	// Validate Bulgarian text
+	if err := audio.ValidateBulgarianText(word); err != nil {
+		dialog.ShowError(err, a.window)
+		return
+	}
+	
+	// Clear previous content
+	a.clearUI()
+	
+	a.currentWord = word
+	a.setUIEnabled(false)
+	a.showProgress("Generating materials for: " + word)
+	
+	// Generate in background
+	a.wg.Add(1)
+	go func() {
+		defer a.wg.Done()
+		a.generateMaterials(word)
+	}()
+}
+
+// generateMaterials generates all materials for a word
+func (a *Application) generateMaterials(word string) {
+	// Translate word
+	fyne.Do(func() {
+		a.updateStatus("Translating...")
+	})
+	translation, err := a.translateWord(word)
+	if err != nil {
+		fyne.Do(func() {
+			a.showError(fmt.Errorf("Translation failed: %w", err))
+			a.setUIEnabled(true)
+		})
+		return
+	}
+	a.currentTranslation = translation
+	fyne.Do(func() {
+		a.translationText.SetText(fmt.Sprintf("%s = %s", word, translation))
+	})
+	
+	// Generate audio
+	fyne.Do(func() {
+		a.updateStatus("Generating audio...")
+	})
+	audioFile, err := a.generateAudio(word)
+	if err != nil {
+		fyne.Do(func() {
+			a.showError(fmt.Errorf("Audio generation failed: %w", err))
+			a.setUIEnabled(true)
+		})
+		return
+	}
+	a.currentAudioFile = audioFile
+	fyne.Do(func() {
+		a.audioPlayer.SetAudioFile(audioFile)
+	})
+	
+	// Generate images
+	fyne.Do(func() {
+		a.updateStatus("Downloading images...")
+	})
+	images, err := a.generateImages(word)
+	if err != nil {
+		fyne.Do(func() {
+			a.showError(fmt.Errorf("Image download failed: %w", err))
+			a.setUIEnabled(true)
+		})
+		return
+	}
+	a.currentImages = images
+	fyne.Do(func() {
+		a.imageDisplay.SetImages(images)
+	})
+	
+	// Enable action buttons
+	fyne.Do(func() {
+		a.hideProgress()
+		a.updateStatus("Ready - Review and decide")
+		a.setUIEnabled(true)
+		a.setActionButtonsEnabled(true)
+	})
+}
+
+// onKeepAndContinue saves the current card and clears for next
+func (a *Application) onKeepAndContinue() {
+	// Save current card
+	card := anki.Card{
+		Bulgarian:   a.currentWord,
+		AudioFile:   a.currentAudioFile,
+		ImageFiles:  a.currentImages,
+		Translation: a.currentTranslation,
+	}
+	
+	a.mu.Lock()
+	a.savedCards = append(a.savedCards, card)
+	count := len(a.savedCards)
+	a.mu.Unlock()
+	
+	// Save translation file for future navigation
+	if a.currentTranslation != "" {
+		filename := sanitizeFilename(a.currentWord)
+		translationFile := filepath.Join(a.config.OutputDir, fmt.Sprintf("%s_translation.txt", filename))
+		content := fmt.Sprintf("%s = %s\n", a.currentWord, a.currentTranslation)
+		os.WriteFile(translationFile, []byte(content), 0644)
+	}
+	
+	// Rescan existing words to include the new one
+	a.scanExistingWords()
+	
+	// Clear UI for next word
+	a.clearUI()
+	a.updateStatus(fmt.Sprintf("Card saved! Total cards: %d", count))
+	a.wordInput.SetText("")
+	a.wordInput.FocusGained() // Focus input for next word
+}
+
+// onRegenerateImage regenerates only the image
+func (a *Application) onRegenerateImage() {
+	a.setActionButtonsEnabled(false)
+	a.showProgress("Regenerating image...")
+	
+	// Clear the current image immediately
+	a.imageDisplay.Clear()
+	
+	a.wg.Add(1)
+	go func() {
+		defer a.wg.Done()
+		
+		images, err := a.generateImages(a.currentWord)
+		if err != nil {
+			fyne.Do(func() {
+				a.showError(fmt.Errorf("Image regeneration failed: %w", err))
+			})
+		} else {
+			a.currentImages = images
+			fyne.Do(func() {
+				a.imageDisplay.SetImages(images)
+			})
+		}
+		
+		fyne.Do(func() {
+			a.hideProgress()
+			a.setActionButtonsEnabled(true)
+		})
+	}()
+}
+
+// onRegenerateAudio regenerates audio with a different voice
+func (a *Application) onRegenerateAudio() {
+	a.setActionButtonsEnabled(false)
+	a.showProgress("Regenerating audio...")
+	
+	a.wg.Add(1)
+	go func() {
+		defer a.wg.Done()
+		
+		audioFile, err := a.generateAudio(a.currentWord)
+		if err != nil {
+			fyne.Do(func() {
+				a.showError(fmt.Errorf("Audio regeneration failed: %w", err))
+			})
+		} else {
+			a.currentAudioFile = audioFile
+			fyne.Do(func() {
+				a.audioPlayer.SetAudioFile(audioFile)
+			})
+		}
+		
+		fyne.Do(func() {
+			a.hideProgress()
+			a.setActionButtonsEnabled(true)
+		})
+	}()
+}
+
+// onRegenerateAll regenerates both audio and images
+func (a *Application) onRegenerateAll() {
+	a.setUIEnabled(false)
+	a.showProgress("Regenerating all materials...")
+	
+	// Clear the current image immediately
+	a.imageDisplay.Clear()
+	
+	a.wg.Add(1)
+	go func() {
+		defer a.wg.Done()
+		a.generateMaterials(a.currentWord)
+	}()
+}
+
+// onExportToAnki exports saved cards to Anki CSV
+func (a *Application) onExportToAnki() {
+	if len(a.savedCards) == 0 {
+		dialog.ShowInformation("No Cards", "No cards to export. Generate some cards first!", a.window)
+		return
+	}
+	
+	// Create save dialog
+	saveDialog := dialog.NewFileSave(func(writer fyne.URIWriteCloser, err error) {
+		if err != nil {
+			dialog.ShowError(err, a.window)
+			return
+		}
+		if writer == nil {
+			return
+		}
+		defer writer.Close()
+		
+		// Generate Anki CSV
+		outputPath := writer.URI().Path()
+		gen := anki.NewGenerator(&anki.GeneratorOptions{
+			OutputPath:     outputPath,
+			MediaFolder:    a.config.OutputDir,
+			IncludeHeaders: true,
+			AudioFormat:    a.config.AudioFormat,
+		})
+		
+		// Add all saved cards
+		for _, card := range a.savedCards {
+			gen.AddCard(card)
+		}
+		
+		// Generate CSV
+		if err := gen.GenerateCSV(); err != nil {
+			dialog.ShowError(fmt.Errorf("Failed to generate CSV: %w", err), a.window)
+			return
+		}
+		
+		dialog.ShowInformation("Export Complete", 
+			fmt.Sprintf("Exported %d cards to:\n%s", len(a.savedCards), outputPath), 
+			a.window)
+	}, a.window)
+	
+	saveDialog.SetFileName("anki_import.csv")
+	saveDialog.SetFilter(storage.NewExtensionFileFilter([]string{".csv"}))
+	saveDialog.Show()
+}
+
+// onPreferences shows the preferences dialog
+func (a *Application) onPreferences() {
+	// This will be implemented in preferences.go
+	dialog.ShowInformation("Preferences", "Preferences dialog coming soon!", a.window)
+}
+
+// Helper methods
+func (a *Application) setUIEnabled(enabled bool) {
+	if enabled {
+		a.wordInput.Enable()
+		a.submitButton.Enable()
+	} else {
+		a.wordInput.Disable()
+		a.submitButton.Disable()
+	}
+}
+
+func (a *Application) setActionButtonsEnabled(enabled bool) {
+	if enabled {
+		a.keepButton.Enable()
+		a.regenerateImageBtn.Enable()
+		a.regenerateAudioBtn.Enable()
+		a.regenerateAllBtn.Enable()
+		a.deleteButton.Enable()
+	} else {
+		a.keepButton.Disable()
+		a.regenerateImageBtn.Disable()
+		a.regenerateAudioBtn.Disable()
+		a.regenerateAllBtn.Disable()
+		a.deleteButton.Disable()
+	}
+}
+
+func (a *Application) showProgress(message string) {
+	a.progressBar.Show()
+	a.progressBar.SetValue(0.5) // Indeterminate progress
+	a.statusLabel.SetText(message)
+}
+
+func (a *Application) hideProgress() {
+	a.progressBar.Hide()
+}
+
+func (a *Application) updateStatus(message string) {
+	a.statusLabel.SetText(message)
+}
+
+func (a *Application) showError(err error) {
+	dialog.ShowError(err, a.window)
+	a.updateStatus("Error: " + err.Error())
+}
+
+func (a *Application) clearUI() {
+	a.imageDisplay.Clear()
+	a.audioPlayer.Clear()
+	a.translationText.SetText("")
+	a.setActionButtonsEnabled(false)
+}
\ No newline at end of file
diff --git a/internal/gui/audio_player.go b/internal/gui/audio_player.go
new file mode 100644
index 0000000..161c635
--- /dev/null
+++ b/internal/gui/audio_player.go
@@ -0,0 +1,168 @@
+package gui
+
+import (
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/widget"
+)
+
+// AudioPlayer is a custom widget for playing audio files
+type AudioPlayer struct {
+	widget.BaseWidget
+	
+	container     *fyne.Container
+	playButton    *widget.Button
+	stopButton    *widget.Button
+	statusLabel   *widget.Label
+	
+	audioFile     string
+	isPlaying     bool
+	playCmd       *exec.Cmd
+}
+
+// NewAudioPlayer creates a new audio player widget
+func NewAudioPlayer() *AudioPlayer {
+	p := &AudioPlayer{}
+	
+	// Create controls
+	p.playButton = widget.NewButton("▶ Play", p.onPlay)
+	p.stopButton = widget.NewButton("■ Stop", p.onStop)
+	p.statusLabel = widget.NewLabel("No audio loaded")
+	
+	// Initially disable controls
+	p.playButton.Disable()
+	p.stopButton.Disable()
+	
+	// Create container
+	p.container = container.NewHBox(
+		p.playButton,
+		p.stopButton,
+		layout.NewSpacer(),
+		p.statusLabel,
+	)
+	
+	p.ExtendBaseWidget(p)
+	return p
+}
+
+// CreateRenderer implements fyne.Widget
+func (p *AudioPlayer) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(p.container)
+}
+
+// SetAudioFile sets the audio file to play
+func (p *AudioPlayer) SetAudioFile(audioFile string) {
+	p.audioFile = audioFile
+	p.isPlaying = false
+	
+	if audioFile != "" {
+		p.playButton.Enable()
+		p.statusLabel.SetText(fmt.Sprintf("Audio: %s", filepath.Base(audioFile)))
+	} else {
+		p.Clear()
+	}
+}
+
+// Clear clears the audio player
+func (p *AudioPlayer) Clear() {
+	p.onStop() // Stop any playing audio
+	p.audioFile = ""
+	p.isPlaying = false
+	p.playButton.Disable()
+	p.stopButton.Disable()
+	p.statusLabel.SetText("No audio loaded")
+}
+
+// onPlay handles play button click
+func (p *AudioPlayer) onPlay() {
+	if p.audioFile == "" {
+		return
+	}
+	
+	if p.isPlaying {
+		// Pause functionality - just stop for now
+		p.onStop()
+		return
+	}
+	
+	// Start playing
+	if err := p.startPlayback(); err != nil {
+		p.statusLabel.SetText(fmt.Sprintf("Error: %v", err))
+		return
+	}
+	
+	p.isPlaying = true
+	p.playButton.SetText("⏸ Pause")
+	p.stopButton.Enable()
+	p.statusLabel.SetText("Playing: " + filepath.Base(p.audioFile))
+}
+
+// onStop handles stop button click
+func (p *AudioPlayer) onStop() {
+	if p.playCmd != nil && p.playCmd.Process != nil {
+		p.playCmd.Process.Kill()
+		p.playCmd = nil
+	}
+	
+	p.isPlaying = false
+	p.playButton.SetText("▶ Play")
+	p.stopButton.Disable()
+	p.statusLabel.SetText("Stopped: " + filepath.Base(p.audioFile))
+}
+
+// startPlayback starts audio playback using platform-specific commands
+func (p *AudioPlayer) startPlayback() error {
+	var cmd *exec.Cmd
+	
+	switch runtime.GOOS {
+	case "darwin": // macOS
+		cmd = exec.Command("afplay", p.audioFile)
+	case "linux":
+		// Try multiple commands in order of preference
+		// mpg123 first since it handles MP3 files best
+		if _, err := exec.LookPath("mpg123"); err == nil {
+			cmd = exec.Command("mpg123", "-q", p.audioFile) // -q for quiet mode
+		} else if _, err := exec.LookPath("ffplay"); err == nil {
+			cmd = exec.Command("ffplay", "-nodisp", "-autoexit", "-loglevel", "quiet", p.audioFile)
+		} else if _, err := exec.LookPath("play"); err == nil {
+			// SoX play command
+			cmd = exec.Command("play", "-q", p.audioFile)
+		} else if _, err := exec.LookPath("paplay"); err == nil {
+			cmd = exec.Command("paplay", p.audioFile)
+		} else if _, err := exec.LookPath("aplay"); err == nil {
+			cmd = exec.Command("aplay", "-q", p.audioFile)
+		} else {
+			return fmt.Errorf("no audio player found. Install mpg123, ffplay, sox, paplay, or aplay")
+		}
+	case "windows":
+		// Use Windows Media Player
+		cmd = exec.Command("cmd", "/c", "start", "/min", p.audioFile)
+	default:
+		return fmt.Errorf("unsupported platform: %s", runtime.GOOS)
+	}
+	
+	// Store the command so we can stop it later
+	p.playCmd = cmd
+	
+	// Start playback in background
+	go func() {
+		err := cmd.Run()
+		if err == nil {
+			// Playback finished normally
+			fyne.Do(func() {
+				p.isPlaying = false
+				p.playButton.SetText("▶ Play")
+				p.stopButton.Disable()
+				p.statusLabel.SetText("Finished: " + filepath.Base(p.audioFile))
+			})
+		}
+	}()
+	
+	return nil
+}
\ No newline at end of file
diff --git a/internal/gui/generator.go b/internal/gui/generator.go
new file mode 100644
index 0000000..7656bcd
--- /dev/null
+++ b/internal/gui/generator.go
@@ -0,0 +1,198 @@
+package gui
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/sashabaranov/go-openai"
+	
+	"codeberg.org/snonux/totalrecall/internal/audio"
+	"codeberg.org/snonux/totalrecall/internal/image"
+)
+
+// translateWord translates a Bulgarian word to English
+func (a *Application) translateWord(word string) (string, error) {
+	if a.config.OpenAIKey == "" {
+		return "", fmt.Errorf("OpenAI API key not configured")
+	}
+	
+	client := openai.NewClient(a.config.OpenAIKey)
+	
+	req := openai.ChatCompletionRequest{
+		Model: openai.GPT4oMini,
+		Messages: []openai.ChatCompletionMessage{
+			{
+				Role:    openai.ChatMessageRoleUser,
+				Content: fmt.Sprintf("Translate the Bulgarian word '%s' to English. Respond with only the English translation, nothing else.", word),
+			},
+		},
+		MaxTokens:   50,
+		Temperature: 0.3,
+	}
+	
+	resp, err := client.CreateChatCompletion(a.ctx, req)
+	if err != nil {
+		return "", fmt.Errorf("OpenAI API error: %w", err)
+	}
+	
+	if len(resp.Choices) == 0 {
+		return "", fmt.Errorf("no translation returned")
+	}
+	
+	translation := strings.TrimSpace(resp.Choices[0].Message.Content)
+	return translation, nil
+}
+
+// generateAudio generates audio for a word
+func (a *Application) generateAudio(word string) (string, error) {
+	// Get available voices
+	allVoices := []string{"alloy", "ash", "ballad", "coral", "echo", "fable", "onyx", "nova", "sage", "shimmer", "verse"}
+	
+	// Select a random voice
+	rand.Seed(time.Now().UnixNano())
+	voice := allVoices[rand.Intn(len(allVoices))]
+	
+	// Update audio config with random voice
+	a.audioConfig.OpenAIVoice = voice
+	
+	// Create audio provider
+	provider, err := audio.NewProvider(a.audioConfig)
+	if err != nil {
+		return "", err
+	}
+	
+	// Generate filename
+	filename := sanitizeFilename(word)
+	outputFile := filepath.Join(a.config.OutputDir, fmt.Sprintf("%s.%s", filename, a.config.AudioFormat))
+	
+	// Generate audio
+	err = provider.GenerateAudio(a.ctx, word, outputFile)
+	if err != nil {
+		return "", err
+	}
+	
+	// Save audio attribution
+	if err := a.saveAudioAttribution(word, outputFile, voice); err != nil {
+		// Non-fatal error, just log it
+		fmt.Printf("Warning: Failed to save audio attribution: %v\n", err)
+	}
+	
+	return outputFile, nil
+}
+
+// generateImages downloads images for a word
+func (a *Application) generateImages(word string) ([]string, error) {
+	// Create image searcher based on provider
+	var searcher image.ImageSearcher
+	var err error
+	
+	switch a.config.ImageProvider {
+	case "pixabay":
+		searcher = image.NewPixabayClient(a.config.PixabayKey)
+		
+	case "unsplash":
+		if a.config.UnsplashKey == "" {
+			return nil, fmt.Errorf("Unsplash API key is required")
+		}
+		searcher, err = image.NewUnsplashClient(a.config.UnsplashKey)
+		if err != nil {
+			return nil, err
+		}
+		
+	case "openai":
+		openaiConfig := &image.OpenAIConfig{
+			APIKey:      a.config.OpenAIKey,
+			Model:       "dall-e-2",  // DALL-E 2 supports 512x512
+			Size:        "512x512",   // Half of 1024x1024
+			Quality:     "standard",
+			Style:       "natural",
+			CacheDir:    "./.image_cache",
+			EnableCache: a.config.EnableCache,
+		}
+		
+		searcher = image.NewOpenAIClient(openaiConfig)
+		if openaiConfig.APIKey == "" {
+			// Fall back to Pixabay
+			searcher = image.NewPixabayClient("")
+		}
+		
+	default:
+		return nil, fmt.Errorf("unknown image provider: %s", a.config.ImageProvider)
+	}
+	
+	// Create downloader
+	downloadOpts := &image.DownloadOptions{
+		OutputDir:         a.config.OutputDir,
+		OverwriteExisting: true,
+		CreateDir:         true,
+		FileNamePattern:   "{word}_{index}",
+		MaxSizeBytes:      5 * 1024 * 1024, // 5MB
+	}
+	
+	downloader := image.NewDownloader(searcher, downloadOpts)
+	
+	// Download images
+	var paths []string
+	
+	if a.config.ImagesPerWord == 1 {
+		_, path, err := downloader.DownloadBestMatch(a.ctx, word)
+		if err != nil {
+			return nil, err
+		}
+		paths = []string{path}
+	} else {
+		paths, err = downloader.DownloadMultiple(a.ctx, word, a.config.ImagesPerWord)
+		if err != nil {
+			return nil, err
+		}
+	}
+	
+	return paths, nil
+}
+
+// saveAudioAttribution saves attribution info for generated audio
+func (a *Application) saveAudioAttribution(word, audioFile, voice string) error {
+	attribution := fmt.Sprintf("Audio generated by OpenAI TTS\n\n")
+	attribution += fmt.Sprintf("Bulgarian word: %s\n", word)
+	attribution += fmt.Sprintf("Model: %s\n", a.audioConfig.OpenAIModel)
+	attribution += fmt.Sprintf("Voice: %s\n", voice)
+	attribution += fmt.Sprintf("Speed: %.2f\n", a.audioConfig.OpenAISpeed)
+	
+	if a.audioConfig.OpenAIInstruction != "" {
+		attribution += fmt.Sprintf("\nVoice instructions:\n%s\n", a.audioConfig.OpenAIInstruction)
+	}
+	
+	attribution += fmt.Sprintf("\nGenerated at: %s\n", time.Now().Format("2006-01-02 15:04:05"))
+	
+	// Save to file
+	attrPath := strings.TrimSuffix(audioFile, filepath.Ext(audioFile)) + "_attribution.txt"
+	if err := os.WriteFile(attrPath, []byte(attribution), 0644); err != nil {
+		return fmt.Errorf("failed to write audio attribution file: %w", err)
+	}
+	
+	return nil
+}
+
+// sanitizeFilename creates a safe filename from a string
+func sanitizeFilename(s string) string {
+	result := ""
+	for _, r := range s {
+		if isAlphaNumeric(r) || r == '-' || r == '_' {
+			result += string(r)
+		} else {
+			result += "_"
+		}
+	}
+	return result
+}
+
+// isAlphaNumeric checks if a rune is alphanumeric
+func isAlphaNumeric(r rune) bool {
+	return (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || 
+	       (r >= '0' && r <= '9') || (r >= 'а' && r <= 'я') || 
+	       (r >= 'А' && r <= 'Я')
+}
\ No newline at end of file
diff --git a/internal/gui/navigation.go b/internal/gui/navigation.go
new file mode 100644
index 0000000..f8931ba
--- /dev/null
+++ b/internal/gui/navigation.go
@@ -0,0 +1,268 @@
+package gui
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/dialog"
+)
+
+// scanExistingWords scans the output directory for existing words
+func (a *Application) scanExistingWords() {
+	a.existingWords = []string{}
+	
+	// Read directory
+	entries, err := os.ReadDir(a.config.OutputDir)
+	if err != nil {
+		// Directory doesn't exist yet, that's OK
+		return
+	}
+	
+	// Collect unique words
+	wordMap := make(map[string]bool)
+	
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		
+		name := entry.Name()
+		// Skip attribution and translation files
+		if strings.Contains(name, "_attribution") || strings.Contains(name, "_translation") {
+			continue
+		}
+		
+		// Extract word from filename (before first underscore or dot)
+		base := strings.TrimSuffix(name, filepath.Ext(name))
+		parts := strings.Split(base, "_")
+		if len(parts) > 0 {
+			word := parts[0]
+			wordMap[word] = true
+		}
+	}
+	
+	// Convert map to sorted slice
+	for word := range wordMap {
+		a.existingWords = append(a.existingWords, word)
+	}
+	sort.Strings(a.existingWords)
+	
+	// Update navigation buttons
+	a.updateNavigation()
+	
+	// Load first word if available and nothing is loaded yet
+	if len(a.existingWords) > 0 && a.currentWord == "" {
+		a.loadWordByIndex(0)
+	}
+}
+
+// updateNavigation updates the navigation button states
+func (a *Application) updateNavigation() {
+	if len(a.existingWords) > 0 {
+		a.prevWordBtn.Enable()
+		a.nextWordBtn.Enable()
+		
+		// Find current word index
+		a.currentWordIndex = -1
+		for i, word := range a.existingWords {
+			if word == a.currentWord {
+				a.currentWordIndex = i
+				break
+			}
+		}
+		
+		// Disable at boundaries
+		if a.currentWordIndex <= 0 {
+			a.prevWordBtn.Disable()
+		}
+		if a.currentWordIndex >= len(a.existingWords)-1 || a.currentWordIndex == -1 {
+			a.nextWordBtn.Disable()
+		}
+	} else {
+		a.prevWordBtn.Disable()
+		a.nextWordBtn.Disable()
+	}
+}
+
+// onPrevWord loads the previous word
+func (a *Application) onPrevWord() {
+	if a.currentWordIndex > 0 {
+		a.loadWordByIndex(a.currentWordIndex - 1)
+	}
+}
+
+// onNextWord loads the next word
+func (a *Application) onNextWord() {
+	if a.currentWordIndex < len(a.existingWords)-1 && a.currentWordIndex >= 0 {
+		a.loadWordByIndex(a.currentWordIndex + 1)
+	}
+}
+
+// loadWordByIndex loads a word by its index in existingWords
+func (a *Application) loadWordByIndex(index int) {
+	if index < 0 || index >= len(a.existingWords) {
+		return
+	}
+	
+	word := a.existingWords[index]
+	a.currentWord = word
+	a.currentWordIndex = index
+	
+	// Update input field
+	a.wordInput.SetText(word)
+	
+	// Clear UI
+	a.clearUI()
+	
+	// Load existing files
+	a.loadExistingFiles(word)
+	
+	// Update navigation
+	a.updateNavigation()
+	
+	// Enable action buttons since we have loaded content
+	a.setActionButtonsEnabled(true)
+}
+
+// loadExistingFiles loads existing files for a word
+func (a *Application) loadExistingFiles(word string) {
+	sanitized := sanitizeFilename(word)
+	
+	// Load translation
+	translationFile := filepath.Join(a.config.OutputDir, fmt.Sprintf("%s_translation.txt", sanitized))
+	if data, err := os.ReadFile(translationFile); err == nil {
+		// Parse translation from "word = translation" format
+		content := string(data)
+		parts := strings.Split(content, "=")
+		if len(parts) >= 2 {
+			a.currentTranslation = strings.TrimSpace(parts[1])
+			fyne.Do(func() {
+				a.translationText.SetText(fmt.Sprintf("%s = %s", word, a.currentTranslation))
+			})
+		}
+	}
+	
+	// Load audio file
+	audioFile := filepath.Join(a.config.OutputDir, fmt.Sprintf("%s.%s", sanitized, a.config.AudioFormat))
+	if _, err := os.Stat(audioFile); err == nil {
+		a.currentAudioFile = audioFile
+		fyne.Do(func() {
+			a.audioPlayer.SetAudioFile(audioFile)
+		})
+	}
+	
+	// Load image files
+	a.currentImages = []string{}
+	// Try to find images with different patterns
+	patterns := []string{
+		fmt.Sprintf("%s.jpg", sanitized),
+		fmt.Sprintf("%s.png", sanitized),
+		fmt.Sprintf("%s_0.jpg", sanitized),
+		fmt.Sprintf("%s_0.png", sanitized),
+		fmt.Sprintf("%s_1.jpg", sanitized),
+		fmt.Sprintf("%s_1.png", sanitized),
+	}
+	
+	for _, pattern := range patterns {
+		imagePath := filepath.Join(a.config.OutputDir, pattern)
+		if _, err := os.Stat(imagePath); err == nil {
+			a.currentImages = append(a.currentImages, imagePath)
+			break // Just load the first image found
+		}
+	}
+	
+	if len(a.currentImages) > 0 {
+		fyne.Do(func() {
+			a.imageDisplay.SetImages(a.currentImages)
+		})
+	}
+	
+	fyne.Do(func() {
+		a.updateStatus(fmt.Sprintf("Loaded: %s", word))
+	})
+}
+
+// onDelete deletes the current word's files
+func (a *Application) onDelete() {
+	if a.currentWord == "" {
+		return
+	}
+	
+	// Confirm deletion
+	dialog.ShowConfirm("Delete Word",
+		fmt.Sprintf("Delete all files for '%s'?", a.currentWord),
+		func(confirm bool) {
+			if confirm {
+				a.deleteCurrentWord()
+			}
+		}, a.window)
+}
+
+// deleteCurrentWord deletes all files for the current word
+func (a *Application) deleteCurrentWord() {
+	sanitized := sanitizeFilename(a.currentWord)
+	deletedCount := 0
+	
+	// List of possible files to delete
+	patterns := []string{
+		fmt.Sprintf("%s.mp3", sanitized),
+		fmt.Sprintf("%s.wav", sanitized),
+		fmt.Sprintf("%s.jpg", sanitized),
+		fmt.Sprintf("%s.png", sanitized),
+		fmt.Sprintf("%s.gif", sanitized),
+		fmt.Sprintf("%s_*.jpg", sanitized),
+		fmt.Sprintf("%s_*.png", sanitized),
+		fmt.Sprintf("%s_translation.txt", sanitized),
+		fmt.Sprintf("%s_attribution.txt", sanitized),
+		fmt.Sprintf("%s_*_attribution.txt", sanitized),
+	}
+	
+	// Delete files matching patterns
+	for _, pattern := range patterns {
+		matches, err := filepath.Glob(filepath.Join(a.config.OutputDir, pattern))
+		if err != nil {
+			continue
+		}
+		for _, match := range matches {
+			if err := os.Remove(match); err == nil {
+				deletedCount++
+			}
+		}
+	}
+	
+	// Remove from existingWords
+	newWords := []string{}
+	for _, w := range a.existingWords {
+		if w != a.currentWord {
+			newWords = append(newWords, w)
+		}
+	}
+	a.existingWords = newWords
+	
+	// Clear UI
+	a.clearUI()
+	
+	// Update status
+	fyne.Do(func() {
+		a.updateStatus(fmt.Sprintf("Deleted %d files for '%s'", deletedCount, a.currentWord))
+	})
+	
+	// Clear current word
+	a.currentWord = ""
+	a.wordInput.SetText("")
+	
+	// Try to load previous or next word
+	if a.currentWordIndex > 0 && a.currentWordIndex <= len(a.existingWords) {
+		a.loadWordByIndex(a.currentWordIndex - 1)
+	} else if len(a.existingWords) > 0 {
+		a.loadWordByIndex(0)
+	} else {
+		// No more words
+		a.updateNavigation()
+		a.setActionButtonsEnabled(false)
+	}
+}
\ No newline at end of file
diff --git a/internal/gui/widgets.go b/internal/gui/widgets.go
new file mode 100644
index 0000000..eb9818c
--- /dev/null
+++ b/internal/gui/widgets.go
@@ -0,0 +1,122 @@
+package gui
+
+import (
+	"fmt"
+	"image"
+	_ "image/gif"
+	_ "image/jpeg"
+	_ "image/png"
+	"os"
+	"path/filepath"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+)
+
+// ImageDisplay is a custom widget for displaying images
+type ImageDisplay struct {
+	widget.BaseWidget
+	
+	container      *fyne.Container
+	imageCanvas    *canvas.Image
+	imageLabel     *widget.Label
+	
+	currentImage   string
+}
+
+// NewImageDisplay creates a new image display widget
+func NewImageDisplay() *ImageDisplay {
+	d := &ImageDisplay{}
+	
+	// Create image canvas
+	d.imageCanvas = canvas.NewImageFromResource(nil)
+	d.imageCanvas.FillMode = canvas.ImageFillContain
+	d.imageCanvas.SetMinSize(fyne.NewSize(200, 150))  // Half the size
+	
+	// Create label
+	d.imageLabel = widget.NewLabel("No image")
+	d.imageLabel.Alignment = fyne.TextAlignCenter
+	
+	// Create main container - no navigation buttons here
+	d.container = container.NewBorder(
+		nil,
+		d.imageLabel,
+		nil, nil,
+		d.imageCanvas,
+	)
+	
+	d.ExtendBaseWidget(d)
+	return d
+}
+
+// CreateRenderer implements fyne.Widget
+func (d *ImageDisplay) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(d.container)
+}
+
+// SetImage sets a single image to display
+func (d *ImageDisplay) SetImage(imagePath string) {
+	if imagePath == "" {
+		d.Clear()
+		return
+	}
+	
+	d.currentImage = imagePath
+	
+	// Load image from file
+	file, err := os.Open(imagePath)
+	if err != nil {
+		d.imageLabel.SetText(fmt.Sprintf("Error loading image: %v", err))
+		return
+	}
+	defer file.Close()
+	
+	img, _, err := image.Decode(file)
+	if err != nil {
+		d.imageLabel.SetText(fmt.Sprintf("Error decoding image: %v", err))
+		return
+	}
+	
+	// Update canvas
+	d.imageCanvas.Image = img
+	d.imageCanvas.Refresh()
+	
+	// Update label
+	d.imageLabel.SetText(filepath.Base(imagePath))
+}
+
+// SetImages sets multiple images but only displays the first one
+func (d *ImageDisplay) SetImages(images []string) {
+	if len(images) > 0 {
+		d.SetImage(images[0])
+	} else {
+		d.Clear()
+	}
+}
+
+// Clear clears the display
+func (d *ImageDisplay) Clear() {
+	d.currentImage = ""
+	d.imageCanvas.Image = nil
+	d.imageCanvas.Refresh()
+	d.imageLabel.SetText("No image")
+}
+
+
+// ResourceFromPath creates a Fyne resource from a file path
+func ResourceFromPath(path string) (fyne.Resource, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	
+	return fyne.NewStaticResource(filepath.Base(path), data), nil
+}
\ No newline at end of file