feat(playback): Change playback to a concise summary view

- The 'playback' command now prints a one-line summary for each
  chat topic.
- The summary includes the topic name, the number of entries,
  and the start time of the conversation.

doPlayback.go

@@ -1,11 +1,36 @@
 package main
 
 import (
+	"fmt"
+
 	"go.wit.com/log"
 )
 
 func doPlayback() {
-	for i, chat := range me.chats.GetChats() {
-		log.Info(i, chat.Uuid, chat.From)
+	log.Infof("Found %d chat topic(s) in the log.", len(me.chats.GetChats()))
+	fmt.Println("-------------------------------------------------")
+
+	// Iterate through the top-level Chat messages, which are now named groups.
+	for _, chat := range me.chats.GetChats() {
+		
+		// Get the number of entries in the chat.
+		entryCount := len(chat.GetEntries())
+
+		// Get the timestamp of the first entry to represent the chat's start time.
+		var formattedTime string
+		if entryCount > 0 && chat.GetEntries()[0].GetCtime() != nil {
+			t := chat.GetEntries()[0].GetCtime().AsTime()
+			formattedTime = t.Format("2006-01-02 15:04:05") // YYYY-MM-DD HH:MM:SS
+		} else {
+			formattedTime = "No Timestamp"
+		}
+
+		// Print the formatted one-line summary.
+		fmt.Printf("Topic: %-25s | Entries: %-4d | Started: %s\n",
+			chat.GetChatName(),
+			entryCount,
+			formattedTime,
+		)
 	}
+	fmt.Println("-------------------------------------------------")
 }