Add Blind Mode to obscure recommended problem on setup and hide LeetCode mapping in interview view

[woohsin]

Summary

The current interview workflow reveals problem identities prematurely:

1. Setup page: The recommended title is shown before starting (e.g., Recommended: Latency Rank Query.).
2. Interview room: The underlying LeetCode reference (e.g., LeetCode: Two Sum, LeetCode: Add Binary) is printed directly under INTERVIEW EXERCISE.

I propose adding a Blind Mode toggle on the setup page that hides the recommended problem title and strips the LeetCode reference from the candidate panel during the session.

Motivation

• Authentic simulation: Real interviews never disclose questions in advance. Hiding the title preserves unpredictability and realistic time pressure.
• Protect problem formulation: CodeTrial wraps problems into domain scenarios. Leaking raw LeetCode names spoils the algorithmic pattern and bypasses the requirement-clarification phase.

Proposed Implementation

1. Setup Page:
   • Add a "Blind Mode" toggle.
   • When enabled, mask the recommended title (e.g., Problem: Hidden (Random Medium)) while keeping Choose a specific problem instead accessible for targeted drills.
2. Interview Room:
   • Display the scenario text and examples as usual, but hide the LeetCode: <Title> line under INTERVIEW EXERCISE during the interview.
   • Reveal the LeetCode reference only in the post-interview feedback report for review.

[jserv]

#152 asks for the opposite of this request: show the LeetCode name and a link under the title. The interview page already shows the name on every problem (web/render.js:175), deliberately, so the problem can be found again after the interview. The lobby hides the same name unless "Show the LeetCode problem" is checked (web/app.js:125). This request and #152 are one decision about one line. Please read #152 and say whether hiding the interview line behind that same lobby toggle would cover your case, since that would add no new mode.