fix(samples): no encryption where the platform cannot do it

[renefloor]

The lobby offered end-to-end encryption on web, where EncryptionManager.isSupported is false: the switch was live, the call was created with autoOn, and only _attachE2EE — long after creation — checked the platform. Joining a call somebody else had encrypted was equally unguarded.

Only Android, iOS and macOS ship the encryption manager. Everywhere else:

• the card drops the switch and the key field and says "Not supported on this platform";
• an encrypted call reads "This call is encrypted and cannot be joined on this platform", in warning colours, with the join button disabled;
• getOrCreate never asks for autoOn, so no encrypted call can be created there;
• _joinCallPressed refuses anyway — the button is not the only way in (a deep link, or a host driving StreamLobbyView) — and refuses again after creation, since getOrCreate can turn up a call someone else created encrypted;
• an invite key in the URL is ignored for a call that does not exist yet, rather than creating a call web would then be locked out of. An invite to an existing encrypted call still lands on the blocked card.

Sample app only; no SDK change.

Testing

Ran the sample on Chrome from this branch: a new call shows the unsupported card, and the existing encrypted teste2e call shows the blocked card with the join button greyed out.

🤖 Generated with Claude Code

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Codecov Report

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Additional details and impacted files

@@          Coverage Diff          @@
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  Coverage      ?   31.16%           
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  Files         ?      374           
  Lines         ?    28789           
  Branches      ?        0           
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  Hits          ?     8972           
  Misses        ?    19817           
  Partials      ?        0           

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