Let candidates propose their own examples instead of reading existing ones

[ascodeasice]

Who is affected
A candidate in the REACTO Example step. Jim asks for an ordinary and a boundary case, but the Problem tab already shows one or two existing examples, so the step can be passed by reading them aloud.

I think hiding them would make the session more realistic and a better test of understanding.

Desired outcome
Before the interview, the candidate can choose to start without the existing examples.

Present workaround
None.

Scope
The example blocks on the interview page and what Jim is told about them. Not the lobby, the problem bank or the judges.

Acceptance criteria

1. A preflight choice, remembered between visits, hides the example blocks; the brief stays.
2. Without the choice, the page is unchanged.
3. With examples hidden, Jim is not told they are on screen, so he does not point the candidate at them.

Related: #38 replaced the published examples with unpublished judge cases; this goes one step further and lets the candidate hide them.

[RLungWu]

+1 for making this an optional preflight setting.
As a learner, having the examples visible helps me understand the problem and help me start thinking. Also, from my experience, simply reading the given examples aloud doesn't get a high rating from Jim anyway—he still expects real reasoning and edge cases.
An opt-in toggle is a great balance for both beginners needing scaffolding and advanced users wanting an extra challenge.

[jserv]

@RLungWu Open PR #174 already implements this, and references this issue. It hides the worked examples behind a preflight choice and keeps the brief, which covers acceptance criteria 1 through 3 here.

Rather than writing a second implementation, please review PR #174 and raise anything it misses there. Criterion 4 is the one worth checking first: whether "Add a case" still shows the input format it expects once the examples are hidden, since the examples are otherwise the only sample of that format on the page. Your point about reading examples aloud is an argument for the preflight choice defaulting off, which is also a review comment on that PR.

This issue closes when PR #174 merges.