tasks 00d, 006, 007: move test seams to struct fields, centralize Viper config, extract shared card-dir logic

task 00d: remove package-level var test seams from processor and gui packages;
  factory functions (newAudioProvider, newOpenAIImageClient, newNanoBananaImageClient)
  are now struct fields on Processor and Application, initialized with production
  defaults in constructors and replaced in tests without global mutation.

task 006: add viperConfig struct captured once in NewProcessor; no method body
  calls viper.GetString/IsSet/GetFloat64 directly any more — all config-file values
  are accessed via p.viperCfg fields.

task 007: extract FindCardDirectory and FindOrCreateCardDirectory into
  internal/utils.go; both Processor.findCardDirectory and
  Application.findCardDirectory now delegate to the shared implementation,
  which also handles the legacy _word.txt backward-compat fallback.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 3 insertions, 13 deletions

diff --git a/internal/gui/generator.go b/internal/gui/generator.go
index 4763149..4b55608 100644
--- a/internal/gui/generator.go
+++ b/internal/gui/generator.go
@@ -22,16 +22,6 @@ type promptAwareImageClient interface {
 	SetPromptCallback(func(prompt string))
 }
 
-var newOpenAIImageClient = func(config *image.OpenAIConfig) promptAwareImageClient {
-	return image.NewOpenAIClient(config)
-}
-
-var newNanoBananaImageClient = func(config *image.NanoBananaConfig) promptAwareImageClient {
-	return image.NewNanoBananaClient(config)
-}
-
-var newAudioProvider = audio.NewProvider
-
 func randomVoice(voices []string) string {
 	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
 	return voices[rng.Intn(len(voices))]
@@ -123,7 +113,7 @@ func (a *Application) audioConfigForGeneration(voice string, speed float64) audi
 func (a *Application) generateAudioFile(ctx context.Context, text, outputFile, voice string, speed float64) error {
 	audioConfig := a.audioConfigForGeneration(voice, speed)
 
-	provider, err := newAudioProvider(&audioConfig)
+	provider, err := a.newAudioProvider(&audioConfig)
 	if err != nil {
 		return err
 	}
@@ -410,7 +400,7 @@ func (a *Application) newImageSearcher() (promptAwareImageClient, error) {
 			Style:   "natural",
 		}
 
-		return newOpenAIImageClient(openaiConfig), nil
+		return a.newOpenAIImageClient(openaiConfig), nil
 	case imageProviderNanoBanana:
 		config := a.config
 		if config == nil {
@@ -426,7 +416,7 @@ func (a *Application) newImageSearcher() (promptAwareImageClient, error) {
 			TextModel: config.NanoBananaTextModel,
 		}
 
-		return newNanoBananaImageClient(nanoBananaConfig), nil
+		return a.newNanoBananaImageClient(nanoBananaConfig), nil
 	default:
 		return nil, fmt.Errorf("unknown image provider: %s", a.config.ImageProvider)
 	}