fix(playback): Make playback independent of the filesystem

- Refactor the prettyFormat.go functions to render all content
  directly from the 'Content' fields of the protobuf messages.
- Remove all 'os.ReadFile' calls from the formatting logic.
- This ensures the 'playback' command is self-contained and works
  correctly on saved protobuf data where the original content files
  are no longer available.

prettyFormat.go

@@ -1,8 +1,13 @@
+// This file contains functions for formatting and printing chat logs to the terminal.
+// These functions operate exclusively on the in-memory protobuf data structures.
+// They do NOT access the filesystem; all content (from content files, snippets, etc.)
+// is expected to have been loaded into the 'Content' fields of the protobuf messages
+// before these functions are called.
+
 package main
 
 import (
 	"fmt"
-	"os"
 	"path/filepath"
 	"strings"
 
@@ -17,14 +22,6 @@ func prettyFormatChat(chat *chatpb.Chat) {
 	fmt.Printf("== Chat Topic: %s (UUID: %s)\n", chat.GetChatName(), chat.GetUuid())
 	fmt.Printf("========================================================\n\n")
 
-	// Since content files are relative, we need a path to a log file.
-	// We can reconstruct the config path using the same logic as ConfigSave/ConfigLoad.
-	logDir := os.Getenv("GEMINI_HOME")
-	if logDir == "" {
-		homeDir, _ := os.UserHomeDir()
-		logDir = filepath.Join(homeDir, ".config/gemini")
-	}
-
 	for _, entry := range chat.GetEntries() {
 		author := entry.GetFrom().String()
 		var formattedTime string
@@ -35,18 +32,8 @@ func prettyFormatChat(chat *chatpb.Chat) {
 			formattedTime = "No Timestamp"
 		}
 
-		var content string
-		if contentFile := entry.GetContentFile(); contentFile != "" {
-			contentPath := filepath.Join(logDir, contentFile)
-			contentBytes, err := os.ReadFile(contentPath)
-			if err != nil {
-				content = fmt.Sprintf("---	ERROR: Could not read content file %s: %v ---", contentPath, err)
-			} else {
-				content = string(contentBytes)
-			}
-		} else {
-			content = entry.GetContent()
-		}
+		// Use the in-memory Content field directly.
+		content := entry.GetContent()
 
 		if content != "" {
 			fmt.Printf("✦ %s (%s):\n%s\n", author, formattedTime, strings.TrimSpace(content))
@@ -60,7 +47,7 @@ func prettyFormatChat(chat *chatpb.Chat) {
 		}
 		if snippets := entry.GetSnippets(); snippets != nil {
 			for _, snippet := range snippets {
-				printCodeSnippet(snippet, logDir)
+				printCodeSnippet(snippet)
 			}
 		}
 		fmt.Println()
@@ -78,15 +65,10 @@ func printTable(table *chatpb.Table) {
 	fmt.Printf("└─────────────────────────────────────────────────────────\n\n")
 }
 
-func printCodeSnippet(snippet *chatpb.CodeSnippet, logDir string) {
-	snippetPath := filepath.Join(logDir, snippet.GetFilename())
-	codeBytes, err := os.ReadFile(snippetPath)
-	if err != nil {
-		fmt.Printf("┌─[ ERROR: Could not read snippet file %s ]─\n\n", snippetPath)
-		return
-	}
-	code := string(codeBytes)
-	language := filepath.Base(snippet.GetFilename())
+func printCodeSnippet(snippet *chatpb.CodeSnippet) {
+	// Use the in-memory Content field directly.
+	code := snippet.GetContent()
+	language := filepath.Base(snippet.GetFilename()) // Still useful for display
 	fmt.Printf("┌─[ Code Snippet: %s ]──────────────────────────────────\n", language)
 	for _, line := range strings.Split(strings.TrimSpace(code), "\n") {
 		fmt.Printf("│ %s\n", line)