fix(browser-mcp): fix download list retrieval and path issues

[skychx]

• Fix resourceUri path error
• Use browser (not page) to create CDPSession: unexpected page closure auto-closes CDPSession, breaking browser download event listening

[netlify]

✅ Deploy Preview for agent-tars-docs canceled.

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[netlify]

✅ Deploy Preview for tarko canceled.

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 14.27%. Comparing base (9896387) to head (18d6c53).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ent-infra/mcp-servers/browser/src/utils/browser.ts	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1753      +/-   ##
==========================================
+ Coverage   14.26%   14.27%   +0.01%     
==========================================
  Files         250      250              
  Lines        8562     8565       +3     
  Branches     1672     1674       +2     
==========================================
+ Hits         1221     1223       +2     
  Misses       7166     7166              
- Partials      175      176       +1     

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