[sosnovsky]

This PR reduces repeated test setup and improves test reliability and coverage:

• combine related live Gmail scenarios to reuse account and browser setup
• parameterize decryption, sender, and malformed-key tests to remove duplicated code
• remove recovery tests already covered by the wrong-passphrase-then-success scenario
• replace randomized buffer checks with deterministic cases covering padding, all byte values, and chunk boundaries
• fix alias sender coverage and validate the expected sender in mocked password-protected messages
• strengthen WKD fallback, key revocation, and PGP armor boundary assertions

no issue

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Tests (delete all except exactly one):

• Tests added or updated

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• if this PR fixes a security issue: I tried to bypass the new fix, and failed (leave unticked if this PR is not a security fix)
• is documented clearly and usefully, or doesn't need documentation