Web - Room attendee count increases if the same user registers on different tabs or browsers

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**Description:** I think, we are generating a different token every time an email is used to register. So, if a user registers with the same email in different tabs or browsers, and visits the same room, the attendee count increases.

Env:

- Desktop Mackbook Pro - Monterey OS
- Chrome 116 and Safari 15.3

**Pre-req:**
Open the chat link [https://chat.elixirconf.com/](https://chat.elixirconf.com/) and register with the same email in different tabs/browsers.

**STR:**
Assuming we have registered with the same email address on 2 different browsers (ex: Chrome and Safari):

1. Visit a chat room (ex: Hallway) in one browser
2. Visit the same chat room (ex: Hallway) on another browser

**Actual:**
The attendee count increases

https://github.com/liveview-native/elixirconf_chat/assets/58893057/677074c0-3c7a-4878-a156-da4b0ed52f96

**Expected:** I guess, tokens are generated for every registration but it doesn't validate based on the email addresses. So the attendee count does not filter out duplicate entries (i:e user registering multiple times with same email). This creates confusion to the user.