fix(react): solve-button not working before lesson loads

[AriPerkkio]

• Split from test: add tests for ui #241

If Solve-button is clicked quickly enough, it does not reveal the solution files. It does change the button text to "Reset" which is not true in that case.

tutorialkit/packages/runtime/src/store/index.ts

Lines 290 to 295 in 095ed57

	solve() {
	const isReady = this.lessonFullyLoaded.value;
	if (!isReady || !this._lessonSolution) {
	return;
	}

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[Nemikolh]

Good catch! 🤩