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

helpers/pagination.go

@@ -16,3 +16,11 @@ func GetTotalPages(db *sql.DB, tableName, whereClause string, args []interface{}
 	}
 	return totalPages, totalCount
 }
+
+func MakePageRange(current, total int) []int {
+	var pages []int
+	for i := 1; i <= total; i++ {
+		pages = append(pages, i)
+	}
+	return pages
+}