fix: In sign page, when doc is fully signed, update search params with update file url and key

src/pages/sign/index.tsx

@@ -51,7 +51,7 @@ enum SignedStatus {
 }
 
 export const SignPage = () => {
-  const [searchParams] = useSearchParams()
+  const [searchParams, setSearchParams] = useSearchParams()
 
   const [displayInput, setDisplayInput] = useState(false)
 
@@ -123,7 +123,7 @@ export const SignPage = () => {
           const fileName = fileUrl.split('/').pop()
           const file = new File([res.data], fileName!)
 
-          decrypt(file, key).then((arrayBuffer) => {
+          decrypt(file, decodeURIComponent(key)).then((arrayBuffer) => {
             if (arrayBuffer) handleDecryptedArrayBuffer(arrayBuffer)
           })
         })
@@ -376,6 +376,14 @@ export const SignPage = () => {
           setAuthUrl
         )
       }
+
+      // when user is the last signer and has sent
+      // the final document to all the signers and viewers
+      // update search params with updated file url and encryption key
+      setSearchParams({
+        file: fileUrl,
+        key: encryptionKey
+      })
     } else {
       const nextSigner = meta.signers[signerIndex + 1]
       await sendDM(