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

handlers/messages.go

@@ -0,0 +1,54 @@
+package handlers
+
+import (
+	"database/sql"
+	"log"
+	"net/http"
+
+	"synlotto-website/helpers"
+	"synlotto-website/storage"
+)
+
+func MessagesInboxHandler(db *sql.DB) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		data := BuildTemplateData(db, w, r)
+		context := helpers.TemplateContext(w, r, data)
+
+		tmpl := helpers.LoadTemplateFiles("messages.html", "templates/account/messages/index.html")
+
+		err := tmpl.ExecuteTemplate(w, "layout", context)
+		if err != nil {
+			helpers.RenderError(w, r, 500)
+		}
+	}
+}
+
+func ReadMessageHandler(db *sql.DB) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		idStr := r.URL.Query().Get("id")
+		messageID := helpers.Atoi(idStr)
+
+		session, _ := helpers.GetSession(w, r)
+		userID, ok := session.Values["user_id"].(int)
+		if !ok {
+			helpers.RenderError(w, r, 403)
+			return
+		}
+
+		message, err := storage.GetMessageByID(db, userID, messageID)
+		if err != nil {
+			log.Printf("❌ Message not found: %v", err)
+			message = nil
+		} else if !message.IsRead {
+			_ = storage.MarkMessageAsRead(db, messageID, userID)
+		}
+
+		data := BuildTemplateData(db, w, r)
+		context := helpers.TemplateContext(w, r, data)
+		context["Message"] = message
+
+		tmpl := helpers.LoadTemplateFiles("read-message.html", "templates/account/messages/read.html")
+
+		tmpl.ExecuteTemplate(w, "layout", context)
+	}
+}