feat: enhance user account handling for Telegram and Polimi email issuers

[BIA3IA]

Closes #14

What

The user directory showed a person's Telegram ID and Polimi address only when the account came from the expected issuer, but some filters and searches skipped that check. They now all apply it:

• Telegram badge and filter: only accounts from https://oauth.telegram.org count.
• Search by Polimi address: only accounts from https://mail.polimi.it are matched.
• Detail page: the Polimi address and its "verified until" date are shown only for accounts from https://mail.polimi.it.

The PoliNetwork sign-in badge (pn-entra) is unchanged; #14 left it as an open question.

[coderabbitai]

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