Fix cannot get topics error by adding User-Agent header

[motangpuar]

Problem

:LeetCodeList fails with:

Error detected while processing function leetcode#ListProblems:
line 31:
E684: List index out of range: 0

caused by cannot get topics in leetcode.py. get_topics_and_companies() requests LC_PROBLEM_SET_ALL and only returns data on a 200 response. That request was failing.

Cause

_make_headers() builds every request without a User-Agent. LeetCode's edge protection blocks or challenges requests that don't look like they came from a browser, so the topics/companies scrape returns a non-200 response even though the session is authenticated and other calls (sign-in, problem fetch) go through.

Fix

Add a standard browser User-Agent to _make_headers().

Testing

Confirmed :LeetCodeSignIn followed by :LeetCodeList now populates the problem list correctly. Before the change, it failed reliably with the error above.

[Copilot]

Pull request overview

This PR addresses :LeetCodeList failures caused by get_topics_and_companies() receiving a non-200 response from LC_PROBLEM_SET_ALL, by making LeetCode requests look more like a browser request.

Changes:

• Add a standard browser User-Agent header to _make_headers() so subsequent authenticated requests aren’t blocked/challenged by edge protection.

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