Wrap Wave with FC

Editor assessment

The subject states the change — the Wave effect wrapper is converted to a function component — using the abbreviation `FC`, which insiders parse instantly but outsiders must decode; no rationale for the conversion is given. The body is a squash-merge bullet list (`refactor: wrap Wave with FC` restated, `test: update test case`) that adds nothing. Type `refactor` is accurate; absent scope is tolerable since the component is named. Footers are absent. Honest and directionally clear, but with the motivation unstated and abbreviation-dependent phrasing, the teaching value is mediocre rather than good.