feat(frontend): preserve email after login

frontend/src/components/Menu/Navbar.vue

@@ -29,10 +29,7 @@
               </div>
               <div>
                 <div data-test="navbar-item-username">{{ username.username }}</div>
-
-                <div data-test="navbar-item-email">
-                  {{ $store.state.email }}
-                </div>
+                <div data-test="navbar-item-email">{{ $store.state.email }}</div>
               </div>
             </div>
           </router-link>

frontend/src/pages/Login.spec.js

@@ -146,6 +146,10 @@ describe('Login', () => {
             expect(mockStoreDispach).toBeCalledWith('login', 'token')
           })
 
+          it('commits email to store', () => {
+            expect(mockStoreCommit).toBeCalledWith('email', 'user@example.org')
+          })
+
           it('hides the spinner', () => {
             expect(spinnerHideMock).toBeCalled()
           })

frontend/src/pages/Login.vue

@@ -100,6 +100,7 @@ export default {
             data: { login },
           } = result
           this.$store.dispatch('login', login)
+          this.$store.commit('email', this.form.email)
           await loader.hide()
           if (this.$route.params.code) {
             this.$router.push(`/redeem/${this.$route.params.code}`)