feat(quick-5): add CreatedAt/UpdatedAt to playlist Summary struct

- Add CreatedAt and UpdatedAt string fields to Summary struct
- Format as RFC3339 at all construction sites in playlist.go and favorites.go
- Update TypeScript bindings with new fields in models.ts

backend/playlist/favorites.go

@@ -3,6 +3,7 @@ package playlist
 import (
 	"errors"
 	"fmt"
+	"time"
 
 	"yellowjacket/backend/database/sql/sqlcgen"
 	"yellowjacket/backend/events"
@@ -82,7 +83,10 @@ func (s *Service) EnsureDefaultPlaylist() {
 	)
 
 	s.emitEvent(events.PlaylistCreated, Summary{
-		ID: created.ID, Name: created.Name,
+		ID:        created.ID,
+		Name:      created.Name,
+		CreatedAt: created.CreatedAt.Format(time.RFC3339),
+		UpdatedAt: created.UpdatedAt.Format(time.RFC3339),
 	})
 }
 
@@ -138,7 +142,12 @@ func (s *Service) GetDefaultPlaylistInfo() (
 		)
 	}
 
-	return Summary{ID: pl.ID, Name: pl.Name}, nil
+	return Summary{
+		ID:        pl.ID,
+		Name:      pl.Name,
+		CreatedAt: pl.CreatedAt.Format(time.RFC3339),
+		UpdatedAt: pl.UpdatedAt.Format(time.RFC3339),
+	}, nil
 }
 
 // ToggleDefaultPlaylistTrack adds or removes a single track

backend/playlist/playlist.go

@@ -12,6 +12,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/wailsapp/wails/v2/pkg/runtime"
 
@@ -44,6 +45,8 @@ type LibraryDirProvider interface {
 type Summary struct {
 	ID        int64  `json:"ID"`
 	Name      string `json:"Name"`
+	CreatedAt string `json:"CreatedAt"`
+	UpdatedAt string `json:"UpdatedAt"`
 }
 
 // Track represents a track within a playlist, including its
@@ -162,6 +165,8 @@ func (s *Service) GetAllPlaylists() ([]Summary, error) {
 		summaries = append(summaries, Summary{
 			ID:        p.ID,
 			Name:      p.Name,
+			CreatedAt: p.CreatedAt.Format(time.RFC3339),
+			UpdatedAt: p.UpdatedAt.Format(time.RFC3339),
 		})
 	}
 
@@ -236,7 +241,12 @@ func (s *Service) GetAllPlaylistsWithTracks() (
 		)
 
 		result = append(result, WithTracks{
-			Summary: Summary{ID: p.ID, Name: p.Name},
+			Summary: Summary{
+				ID:        p.ID,
+				Name:      p.Name,
+				CreatedAt: p.CreatedAt.Format(time.RFC3339),
+				UpdatedAt: p.UpdatedAt.Format(time.RFC3339),
+			},
 			Tracks: tracks,
 		})
 	}
@@ -439,11 +449,17 @@ func (s *Service) CreatePlaylist(
 
 	s.savePlaylistFile(created.ID, created.Name)
 	s.emitEvent(events.PlaylistCreated, Summary{
-		ID: created.ID, Name: created.Name,
+		ID:        created.ID,
+		Name:      created.Name,
+		CreatedAt: created.CreatedAt.Format(time.RFC3339),
+		UpdatedAt: created.UpdatedAt.Format(time.RFC3339),
 	})
 
 	return Summary{
-		ID: created.ID, Name: created.Name,
+		ID:        created.ID,
+		Name:      created.Name,
+		CreatedAt: created.CreatedAt.Format(time.RFC3339),
+		UpdatedAt: created.UpdatedAt.Format(time.RFC3339),
 	}, nil
 }
 
@@ -543,7 +559,10 @@ func (s *Service) CreatePlaylistWithTracks(
 	}
 
 	summary := Summary{
-		ID: created.ID, Name: created.Name,
+		ID:        created.ID,
+		Name:      created.Name,
+		CreatedAt: created.CreatedAt.Format(time.RFC3339),
+		UpdatedAt: created.UpdatedAt.Format(time.RFC3339),
 	}
 
 	s.logger.Info(
@@ -675,7 +694,8 @@ func (s *Service) RenamePlaylist(
 	)
 
 	s.emitEvent(events.PlaylistRenamed, Summary{
-		ID: playlistID, Name: trimmed,
+		ID:   playlistID,
+		Name: trimmed,
 	})
 
 	return nil
@@ -689,8 +709,10 @@ func (s *Service) uniquePlaylistName(name string) string {
 	if err != nil || count == 0 {
 		return name
 	}
+
 	for i := 1; ; i++ {
 		candidate := fmt.Sprintf("%s (%d)", name, i)
+
 		c, err := s.db.Queries.CountPlaylistsByName(s.db.Ctx, candidate)
 		if err != nil || c == 0 {
 			return candidate
@@ -804,7 +826,10 @@ func (s *Service) ImportPlaylist(
 	)
 
 	summary := Summary{
-		ID: created.ID, Name: playlistName,
+		ID:        created.ID,
+		Name:      playlistName,
+		CreatedAt: created.CreatedAt.Format(time.RFC3339),
+		UpdatedAt: created.UpdatedAt.Format(time.RFC3339),
 	}
 
 	s.emitEvent(events.PlaylistCreated, summary)

frontend/wailsjs/go/models.ts

@@ -305,6 +305,8 @@ export namespace playlist {
 	export class Summary {
 	    ID: number;
 	    Name: string;
+	    CreatedAt: string;
+	    UpdatedAt: string;
 	
 	    static createFrom(source: any = {}) {
 	        return new Summary(source);
@@ -314,6 +316,8 @@ export namespace playlist {
 	        if ('string' === typeof source) source = JSON.parse(source);
 	        this.ID = source["ID"];
 	        this.Name = source["Name"];
+	        this.CreatedAt = source["CreatedAt"];
+	        this.UpdatedAt = source["UpdatedAt"];
 	    }
 	}
 	export class Track {