feat(linux): protect saved login with Secret portal - #362
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What changed
Saved Linux login data is encrypted with a per-application secret obtained through the Secret portal and stored only in profile-scoped ciphertext files.
Why
Flatpak cannot assume one desktop keyring implementation, and plaintext fallback would silently weaken saved login protection.
Invariant
Missing portal support fails closed, the renderer never receives the master secret, profile slots are isolated, and the ciphertext is bound to the distribution identity.
Delivery
Review-only credential foundation. No live credentials are used.
Verification
portal helper compilation on Ubuntu
encryption, isolation, clearing, and wrong-secret tests
saved-login and native-keychain policy tests
Focused change
Relevant checks run
Synthetic credentials only