feat(accident): update accident field type and enhance textarea styling

- Changed the accident field type from STRING to TEXT in the Accident model to accommodate larger input.
- Increased the minimum height of the textarea in AccidentFormDialog and added font styling for improved readability.

backend/migrations/20260107_change_accident_to_text.sql

@@ -0,0 +1,3 @@
+-- Change accident field from VARCHAR to TEXT to allow longer descriptions
+ALTER TABLE `accident`
+  MODIFY COLUMN `accident` TEXT NOT NULL;

backend/models/Accident.js

@@ -13,7 +13,7 @@ const Accident = sequelize.define('Accident', {
     allowNull: false,
   },
   accident: {
-    type: DataTypes.STRING,
+    type: DataTypes.TEXT,
     allowNull: false,
     set(value) {
       const encryptedValue = encryptData(value);