fix(ci): change Chromatic build to be triggered when frontend package.json is edited instead of lockfile (#15793)

* fix(ci): correct invalid condition for skipping Chromatic build

* fix: change to be triggered when frontend `package.json` is edited instead of lockfile

* chore: disable automatic rebase of frontend Renovate PRs

renovate.json5

@@ -38,6 +38,8 @@
 				'packages/misskey-reversi/**/package.json',
 				'packages/sw/**/package.json',
 			],
+			// prevent wastage of Chromatic snapshots
+			rebaseWhen: 'never',
 		},
 		{
 			groupName: '[misskey-js] Update dependencies',