§3 animations: the migrated wizard step cards had no transition, so step→step
swaps and modal open were flat. The old mm/* slide system was deleted in Phase
11 (and its classes purged from CSS), and the transaction-edit "reference" uses
an undefined `last-modal-step` no-op — so there was no clean slide to restore.
Apply the codebase's existing `fade-in transition-opacity duration-300`
primitive (`.htmx-added .fade-in` in input.css) to all three wizard step cards
(new-invoice basic-details + accounts, vendor step-card, client step-card). Each
card now fades in on open and on every step swap. Verified live: cards always
settle to opacity 1 (never stuck invisible) on both open and step navigation.
Richer directional (forward/back) slide transitions are left for a design pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Bryce
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