fix: resolve folder drag-and-drop, add remember me, fix pinned folder navigation

backend/middleware/auth.go

@@ -86,11 +86,16 @@ func GenerateAccessToken(userID int, username, secret string, expirySecs int) (s
 }
 
 // GenerateRefreshToken creates a longer-lived refresh token.
-func GenerateRefreshToken(userID int, username, secret string) (string, error) {
+func GenerateRefreshToken(userID int, username, secret string, rememberMe bool) (string, error) {
+	exp := time.Now().Add(7 * 24 * time.Hour).Unix() // 7 days
+	if rememberMe {
+		exp = time.Now().Add(21 * 24 * time.Hour).Unix() // 21 days (3 weeks)
+	}
+
 	claims := jwt.MapClaims{
 		"sub":      userID,
 		"username": username,
-		"exp":      time.Now().Add(7 * 24 * time.Hour).Unix(), // 7 days
+		"exp":      exp,
 		"iat":      time.Now().Unix(),
 		"type":     "refresh",
 	}