improve: better audio player UI and debugging for bg-bg cards

- Add debug logging to navigation.go to diagnose audio file loading issues
  Prints paths being checked and whether files are found

- Improve AudioPlayer UI for Bulgarian-Bulgarian cards:
  - Add labels showing 'Front' and 'Back' for bg-bg audio buttons
  - Labels only show when audio files are actually loaded
  - Better visual distinction between the two playable audios
  - Reorganized button layout with VBox for cleaner appearance

- Track bg-bg state in AudioPlayer (isBgBg field)
  - Automatically set when back audio file is loaded
  - Used to determine when to show labels

This makes it clearer that Bulgarian-Bulgarian cards have two independently
playable audio outputs, and helps debug why audio isn't being loaded.

1 files changed, 65 insertions, 30 deletions

diff --git a/internal/batch/processor.go b/internal/batch/processor.go
index 0b20179..6867c3c 100644
--- a/internal/batch/processor.go
+++ b/internal/batch/processor.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"os"
 	"strings"
+
+	"codeberg.org/snonux/totalrecall/internal"
 )
 
 // WordEntry represents a word with optional translation
@@ -12,6 +14,8 @@ type WordEntry struct {
 	Translation string
 	// NeedsTranslation indicates if translation from English to Bulgarian is needed
 	NeedsTranslation bool
+	// CardType indicates whether this is en-bg or bg-bg card
+	CardType internal.CardType
 }
 
 // ReadBatchFile reads words from a file and returns WordEntry slice
@@ -19,6 +23,7 @@ type WordEntry struct {
 // - Bulgarian word only: "ябълка" (will be translated to English)
 // - With translation: "ябълка = apple" (both provided, no translation needed)
 // - English only: "= apple" (will be translated to Bulgarian)
+// - Bulgarian-Bulgarian: "word1 == definition" (bg-bg card, double equals)
 func ReadBatchFile(filename string) ([]WordEntry, error) {
 	content, err := os.ReadFile(filename)
 	if err != nil {
@@ -30,42 +35,72 @@ func ReadBatchFile(filename string) ([]WordEntry, error) {
 
 	for _, line := range splitLines(lines) {
 		if line = trimSpace(line); line != "" {
-			// Check if line contains '=' for translation format
-			if strings.Contains(line, "=") {
-				parts := strings.SplitN(line, "=", 2)
-				if len(parts) == 2 {
-					bulgarian := strings.TrimSpace(parts[0])
-					english := strings.TrimSpace(parts[1])
-
-					if bulgarian == "" && english != "" {
-						// Format: "= ENGLISH" - need to translate English to Bulgarian
-						entries = append(entries, WordEntry{
-							Bulgarian:        "", // Will be filled by translation
-							Translation:      english,
-							NeedsTranslation: true,
-						})
-					} else if bulgarian != "" && english != "" {
-						// Format: "BULGARIAN = ENGLISH" - both provided
-						entries = append(entries, WordEntry{
-							Bulgarian:        bulgarian,
-							Translation:      english,
-							NeedsTranslation: false,
-						})
-					}
-					// Ignore lines with empty English part
+			entry := parseBatchLine(line)
+			if entry != nil {
+				entries = append(entries, *entry)
+			}
+		}
+	}
+
+	return entries, nil
+}
+
+// parseBatchLine parses a single batch file line and returns the appropriate WordEntry
+func parseBatchLine(line string) *WordEntry {
+	// Check for Bulgarian-Bulgarian format first (double equals ==)
+	if strings.Contains(line, "==") {
+		parts := strings.SplitN(line, "==", 2)
+		if len(parts) == 2 {
+			bulgarian1 := strings.TrimSpace(parts[0])
+			bulgarian2 := strings.TrimSpace(parts[1])
+
+			if bulgarian1 != "" && bulgarian2 != "" {
+				return &WordEntry{
+					Bulgarian:        bulgarian1,
+					Translation:      bulgarian2,
+					NeedsTranslation: false,
+					CardType:         internal.CardTypeBgBg,
 				}
-			} else {
-				// Just a Bulgarian word - needs translation to English
-				entries = append(entries, WordEntry{
-					Bulgarian:        line,
-					Translation:      "",
+			}
+		}
+		return nil
+	}
+
+	// Check for English-Bulgarian format (single equals =)
+	if strings.Contains(line, "=") {
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) == 2 {
+			bulgarian := strings.TrimSpace(parts[0])
+			english := strings.TrimSpace(parts[1])
+
+			if bulgarian == "" && english != "" {
+				// Format: "= ENGLISH" - need to translate English to Bulgarian
+				return &WordEntry{
+					Bulgarian:        "",
+					Translation:      english,
+					NeedsTranslation: true,
+					CardType:         internal.CardTypeEnBg,
+				}
+			} else if bulgarian != "" && english != "" {
+				// Format: "BULGARIAN = ENGLISH" - both provided
+				return &WordEntry{
+					Bulgarian:        bulgarian,
+					Translation:      english,
 					NeedsTranslation: false,
-				})
+					CardType:         internal.CardTypeEnBg,
+				}
 			}
 		}
+		return nil
 	}
 
-	return entries, nil
+	// Just a Bulgarian word - needs translation to English
+	return &WordEntry{
+		Bulgarian:        line,
+		Translation:      "",
+		NeedsTranslation: false,
+		CardType:         internal.CardTypeEnBg,
+	}
 }
 
 // splitLines splits a string by newlines