All seven type forms plus the type-selection screen now show a small
'esc to cancel' subtitle under the heading when rendered in the
fullscreen vault tab (isInTab() === true). The subtitle is suppressed
in the popup, where esc has the more general meaning of closing the
popup. .form-subtitle class is shared between popup and vault
stylesheets so future hooks can reuse it.
Dynamic dirty-state ('unsaved · esc to cancel') wiring is deferred to
Phase 3 (unsaved-changes guard).
Plan 2026-04-30 fullscreen UX phase 1 task 8.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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