[fix] TypeScript warning & errors

TypeScript was going crazy because... TypeScript.
I made an interface for the `report` localStorage, fixed some types problem...

app/responsable/page.tsx

@@ -1,10 +1,11 @@
 "use client";
 import React from "react";
 import EtatDeVaudSignature from "../components/EtatDeVaudSignature";
+import { reportStorageInterface } from "@/interfaces/reportStorageInterface";
 
 export default function Page() {
     const inputFile = React.useRef<HTMLInputElement | null>(null);
-    const [rapportStorage, setRapportStorage] = React.useState({});
+    const [rapportStorage, setRapportStorage] = React.useState<reportStorageInterface>({})
 
     React.useEffect(() => {
         const storedData = localStorage.getItem('rapport-de-stage');
@@ -13,7 +14,7 @@ export default function Page() {
         }
     }, []);
 
-    const handleFileUpload = e => {
+    const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
         const confirm = window.confirm('Voulez-vous vraiment importer les données de ce fichier ?')
         if(confirm) {
             const { files } = e.target;
@@ -29,7 +30,7 @@ export default function Page() {
               const reader = new FileReader();
               reader.onload = (event) => {
                   try {
-                      const fileContent = event.target.result;
+                      const fileContent = event.target?.result as string;
                       const jsonData = JSON.parse(fileContent);
                       localStorage.setItem('rapport-de-stage', JSON.stringify(jsonData))
                       location.reload()
@@ -46,13 +47,13 @@ export default function Page() {
         }
     };
 
-    function updateStorageOnChange(element, elementValue) {
-        rapportStorage[element] = elementValue
+    function updateStorageOnChange(element:string, elementValue:string) {
+        rapportStorage[element as keyof reportStorageInterface] = elementValue
         localStorage.setItem('rapport-de-stage', JSON.stringify(rapportStorage))
     }
 
     function onButtonClick() {
-        inputFile.current.click();
+        inputFile.current?.click();
     };
 
     function download(filename:any, text:any) {

interfaces/reportStorageInterface.tsx

@@ -0,0 +1,54 @@
+export interface reportStorageInterface {
+    internFirstName?: string,
+    internLastName?: string,
+    entrepriseName?: string,
+    responsibleMail?: string,
+    responsibleName?: string,
+    responsiblePostalAddress?: string,
+    responsiblePostalCode?: string,
+    responsibleLocality?: string,
+    responsiblePhone?: string,
+    internClass?: string,
+    internEstablishment?: string,
+    internPostalCode?: string,
+    internLocality?: string,
+    internPhone?: string,
+    internAddress?: string,
+    job?: string,
+    beginDate?: string,
+    endDate?: string,
+    firstImpression?: string,
+    ponctuality?: string,
+    selfConfidence?: string,
+    dynamism?: string,
+    concentrationSpan?: string,
+    curiosity?: string,
+    commitment?: string,
+    interestLearning?: string,
+    attitudeRemarks?: string,
+    skillful?: string,
+    fast?: string,
+    careful?: string,
+    methodical?: string,
+    persevering?: string,
+    attentive?: string,
+    followInstructions?: string,
+    tasksExecRemarks?: string,
+    comfortable?: string,
+    helpful?: string,
+    polite?: string,
+    smiling?: string,
+    confidentToAsk?: string,
+    showInterest?: string,
+    expressClairly?: string,
+    contactRemarks?: string,
+    apprenticeshipJob?: string,
+    opinionRemarks?: string,
+    adviceProject?: string,
+    advicesRemarks?: string,
+    considerCandidate?: string,
+    considerCandidatesRemarks?: string,
+    bilanStage?: string,
+    fillUpDate?: string,
+    signature?: string
+}