Second sub-plan after 1C-α. Adds the 5 remaining typed-item forms
(SecureNote, Identity, Card, Key, Totp) so the extension can daily-
drive every typed item the Rust core supports — Document deferred
to γ for attachment dependencies.
Form style: muted "signature block + uniform rows" pattern
(per-type accent panel + plain rows for the rest). Login is
refactored onto a shared field-helper module as the reference
implementation.
Totp covers `kind: 'totp'` and `kind: 'steam'`. The latter requires
a Rust-core fix (Slice 1) — `compute_totp_code` currently produces
decimal output for Steam but Steam Guard uses a 5-char alphabet
(`23456789BCDFGHJKMNPQRTVWXY`). Plan ships the alphabet patch and
RFC-style test vectors.
Five-slice sequencing: Rust Steam → shared helpers + Login
refactor → SecureNote+Identity → Card+Key → Totp.
Custom fields editor, vault-settings view, advanced generator UI
all moved to β₂. Hotp counter UI deferred. Document type stays in γ.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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