Adds the Memo like action (0x6d04) with optional author tip, a like/tip
page controller, heart icon + modal UI, and acceptance handlers for
specs/like-tip-memo.feature.
By coder.
Extract shared test helpers for the Memo post and Set Name behavior
slices: fake wallet/profiles, MemoAction tests, page-controller tests,
page build wiring, and shared property-test invariants. Behavior is
preserved; all unit, property, and acceptance tests pass.
By refactorer.
Chris Troutner