Improve handling of HTTP 401 (#1194)

## Description:

Improve handling of HTTP 401 by deleting the access token so that the
token will not be used again.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/client/jwt.ts

@@ -133,6 +133,7 @@ function _isLoggedIn(): IsLoggedInResponse {
           console.log("Refreshed access token successfully.");
         } else {
           console.error("Failed to refresh access token.");
+          // TODO: Update the UI to show logged out state
         }
       });
     }
@@ -165,6 +166,11 @@ export async function postRefresh(): Promise<boolean> {
         authorization: `Bearer ${token}`,
       },
     });
+    if (response.status === 401) {
+      localStorage.removeItem("token");
+      __isLoggedIn = false;
+      return false;
+    }
     if (response.status !== 200) return false;
     const body = await response.json();
     const result = RefreshResponseSchema.safeParse(body);
@@ -192,6 +198,11 @@ export async function getUserMe(): Promise<UserMeResponse | false> {
         authorization: `Bearer ${token}`,
       },
     });
+    if (response.status === 401) {
+      localStorage.removeItem("token");
+      __isLoggedIn = false;
+      return false;
+    }
     if (response.status !== 200) return false;
     const body = await response.json();
     const result = UserMeResponseSchema.safeParse(body);