Add message system (inbox, read view, dropdown) and truncate helper

Implemented message retrieval and read logic in storage layer

Added handlers for inbox and individual message view

Integrated messages into topbar dropdown with unread badge

Added truncate helper to template functions

Created new templates: messages/index.html and messages/read.html

Fixed missing template function error in topbar rendering

models/user.go

@@ -23,12 +23,13 @@ type Notification struct {
 }
 
 type Message struct {
-	ID        int
-	Sender    string
-	Subject   string
-	Message   string
-	IsRead    bool
-	CreatedAt time.Time
+	ID          int
+	SenderId    int
+	RecipientId int
+	Subject     string
+	Message     string
+	IsRead      bool
+	CreatedAt   time.Time
 }
 
 var db *sql.DB