adding missing files

front_end/src/Components/Notes/NotesCell.jsx

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+import React, { useState } from "react";
+import { getURLSegment, postJsonData } from "../../Util";
+
+const Modal = ({ isOpen, notes, employee_no, onClose, onSave }) => {
+  const [currentNotes, setCurrentNotes] = useState(notes);
+
+  if (!isOpen) return null;
+
+  const handleSubmit = async (e) => {
+    e.preventDefault();
+    const financialYear = getURLSegment(0);
+    const costCentre = getURLSegment(1);
+    const response = await postJsonData(
+      `/payroll/api/${costCentre}/${financialYear}/employees/notes`,
+      {
+        employee_no,
+        notes: currentNotes,
+      },
+    );
+    console.log(response.status);
+    if (response.status === 204) {
+      onSave(currentNotes);
+      onClose();
+    }
+  };
+
+  return (
+    <div className="govuk-modal-overlay">
+      <div className="govuk-modal">
+        <div className="govuk-modal__header">
+          <h2 className="govuk-heading-m">
+            {notes ? "Edit Notes" : "Add Notes"}
+          </h2>
+        </div>
+        <div className="govuk-modal__header">
+          <span className="govuk-description">
+            Notes will be reset at the end of the {getURLSegment(0)} financial
+            year
+          </span>
+        </div>
+        <form onSubmit={handleSubmit}>
+          <div className="govuk-form-group">
+            <label className="govuk-label" htmlFor="notes">
+              Notes
+            </label>
+            <textarea
+              id="notes"
+              value={currentNotes}
+              onChange={(e) => setCurrentNotes(e.target.value)}
+              className="govuk-textarea"
+              rows="5"
+            />
+          </div>
+          <div className="govuk-button-group">
+            <button
+              type="submit"
+              className="govuk-button"
+              data-module="govuk-button"
+            >
+              Save
+            </button>
+            <button
+              type="button"
+              onClick={onClose}
+              className="govuk-button govuk-button--secondary"
+              data-module="govuk-button"
+            >
+              Cancel
+            </button>
+          </div>
+        </form>
+      </div>
+    </div>
+  );
+};
+
+const NotesCell = ({ notes = "", employee_no }) => {
+  const [isModalOpen, setIsModalOpen] = useState(false);
+  const [currentNotes, setCurrentNotes] = useState(notes);
+
+  const handleSave = (newNotes) => {
+    setCurrentNotes(newNotes);
+    console.log("handeling modal close");
+  };
+  return (
+    <>
+      <a
+        href="#"
+        title={currentNotes}
+        className="govuk-link"
+        onClick={(e) => {
+          e.preventDefault();
+          setIsModalOpen(true);
+        }}
+      >
+        {currentNotes ? "Edit Notes" : "Add Notes"}
+      </a>
+
+      <Modal
+        isOpen={isModalOpen}
+        notes={currentNotes}
+        employee_no={employee_no}
+        onClose={() => setIsModalOpen(false)}
+        onSave={handleSave}
+      />
+    </>
+  );
+};
+
+export default NotesCell;

front_end/styles/notes.scss

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+.govuk-modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: rgba(0, 0, 0, 0.5);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 1000;
+}
+
+.govuk-modal {
+  background: #ffffff;
+  padding: 30px;
+  margin: 30px;
+  width: 100%;
+  max-width: 640px;
+  box-shadow: 0 5px 5px rgba(0, 0, 0, 0.3);
+}
+
+.govuk-modal__header {
+  margin-bottom: 20px;
+}