test(#10336): add components/MkC.* stories (#13830)

* test(storybook): add `components/MkC.*` stories

* test(storybook): add some tests

* test: add sleep

* test: comment-out flaky test

* test(storybook): add test for `MkChannelFollowButton`

* chore(storybook): tweak sleep duration in `MkChannelFollowButton` story test

* fix(chromatic): add delay to `MkChannelList`

* chore: replace `mswDecorator` with `mswLoader`

* fix(storybook): tweak some parameters

* chore: serve static files

* fix(chromatic): add delay to `MkCwButton`

* chore: delete logging for debug

* fix: add right click in `MkContextMenu` play

* refactor: remove unused imports

packages/frontend/src/scripts/test-utils.ts

@@ -7,3 +7,13 @@ export async function tick(): Promise<void> {
 	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 	await new Promise((globalThis.requestIdleCallback ?? setTimeout) as never);
 }
+
+/**
+ * @see https://github.com/misskey-dev/misskey/issues/11267
+ */
+export function semaphore(counter = 0, waiting: (() => void)[] = []) {
+	return {
+		acquire: () => ++counter > 1 && new Promise<void>(resolve => waiting.push(resolve)),
+		release: () => --counter && waiting.pop()?.(),
+	};
+}