Add restore functionality for archived messages

- Added `RestoreMessageHandler` and route at `/account/messages/restore`
- Updated `users_messages` table to support `archived_at` reset
- Added restore button to archived messages template
- Ensures archived messages can be moved back into inbox

handlers/messages.go

@@ -11,13 +11,37 @@ import (
 
 func MessagesInboxHandler(db *sql.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		userID, ok := helpers.GetCurrentUserID(r)
+		if !ok {
+			helpers.RenderError(w, r, 403)
+			return
+		}
+
+		page := helpers.Atoi(r.URL.Query().Get("page"))
+		if page < 1 {
+			page = 1
+		}
+		perPage := 10
+
+		totalCount := storage.GetInboxMessageCount(db, userID)
+		totalPages := (totalCount + perPage - 1) / perPage
+		if totalPages == 0 {
+			totalPages = 1
+		}
+
+		messages := storage.GetInboxMessages(db, userID, page, perPage)
+
 		data := BuildTemplateData(db, w, r)
 		context := helpers.TemplateContext(w, r, data)
 
+		context["Messages"] = messages
+		context["CurrentPage"] = page
+		context["TotalPages"] = totalPages
+		context["PageRange"] = helpers.PageRange(page, totalPages)
+
 		tmpl := helpers.LoadTemplateFiles("messages.html", "templates/account/messages/index.html")
 
-		err := tmpl.ExecuteTemplate(w, "layout", context)
-		if err != nil {
+		if err := tmpl.ExecuteTemplate(w, "layout", context); err != nil {
 			helpers.RenderError(w, r, 500)
 		}
 	}
@@ -136,3 +160,23 @@ func SendMessageHandler(db *sql.DB) http.HandlerFunc {
 		}
 	}
 }
+
+func RestoreMessageHandler(db *sql.DB) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		id := helpers.Atoi(r.URL.Query().Get("id"))
+		userID, ok := helpers.GetCurrentUserID(r)
+		if !ok {
+			helpers.RenderError(w, r, 403)
+			return
+		}
+
+		err := storage.RestoreMessage(db, userID, id)
+		if err != nil {
+			helpers.SetFlash(w, r, "Failed to restore message.")
+		} else {
+			helpers.SetFlash(w, r, "Message restored.")
+		}
+
+		http.Redirect(w, r, "/account/messages/archived", http.StatusSeeOther)
+	}
+}