feat: add letters feature with detail view and listingHEADmain

- Introduced new routes for letters and their details.
- Created pages for displaying letter details and listing letters.
- Added new types for letters, including participants, messages, and attachments.
- Implemented API calls for fetching letters and managing messages (reply, edit, delete).
- Enhanced stats to include unread letters and pending districts for staff users.
- Updated styles for letters and their components.
- Added privacy settings for letters (public and friends).
- Modified user model to include letter privacy settings.
- Improved error handling and user feedback in the UI.

1 files changed, 15 insertions, 7 deletions

diff --git a/shrine/models/user.go b/shrine/models/user.go
index 503c61a..8846aa4 100644
--- a/shrine/models/user.go
+++ b/shrine/models/user.go
@@ -45,6 +45,7 @@ type User struct {
 	DisabledBy      *uint      `gorm:"index"`
 	DisabledUntil   *time.Time
 	WarningCount    uint       `gorm:"not null;default:0"`
+	LetterPrivacy   enums.LetterPrivacy `gorm:"size:20;not null;default:public"`
 	LastSeenAt      *time.Time
 	IP              string     `gorm:"size:45"`
 }
@@ -194,20 +195,27 @@ func (self *User) BeforeCreate(tx *gorm.DB) error {
 }
 
 func (self *User) BeforeUpdate(tx *gorm.DB) error {
-	if !validators.IsValidEmail(self.Email) {
-		return errors.New(messages.InvalidEmail)
+	if self.Email == "" && self.DisplayName == "" {
+		return nil
 	}
 
-	if len(strings.TrimSpace(self.DisplayName)) < 1 || len(strings.TrimSpace(self.DisplayName)) > 50 {
-		return errors.New(messages.InvalidDisplayName)
+	if self.Email != "" {
+		if !validators.IsValidEmail(self.Email) {
+			return errors.New(messages.InvalidEmail)
+		}
+		self.Email = strings.ToLower(strings.TrimSpace(self.Email))
+	}
+
+	if self.DisplayName != "" {
+		if len(strings.TrimSpace(self.DisplayName)) < 1 || len(strings.TrimSpace(self.DisplayName)) > 50 {
+			return errors.New(messages.InvalidDisplayName)
+		}
+		self.DisplayName = strings.TrimSpace(self.DisplayName)
 	}
 
 	if self.Jade > validators.MaxJade {
 		return errors.New(messages.JadeExceedsMax)
 	}
 
-	self.Email = strings.ToLower(strings.TrimSpace(self.Email))
-	self.DisplayName = strings.TrimSpace(self.DisplayName)
-
 	return nil
 }
\ No newline at end of file