perf: polish the web UI and shrink cold start

[njzjz-bot]

Summary

• redesign the browser UI with a cleaner responsive layout, dark-mode support, example chips, clearer progress, and a better result/copy experience
• remove the external GitHub ribbon and Prism assets so the page has fewer blocking CDN requests
• preload the website-local Pyodide bundle and start downloading it in parallel with the Pyodide runtime
• stream the bundle response and surface real downloaded byte counts in the progress message
• remove requests, urllib3, certifi, charset-normalizer, and idna from the browser-only bundle by keeping native requests imports off the Emscripten path
• enforce a < 1,000,000 byte compressed Web bundle budget in CI
• remove the obsolete browser deprecation notice from the README

Cold-start optimization

The currently deployed Pages bundle is 1,474,423 bytes. CI builds the new bundle at 845,131 bytes (about 825 KiB), a 42.7% reduction. The browser networking path uses pyfetch, so the Requests stack in the old archive was unnecessary. This PR reduces the locked browser dependency set to pyiso4, pylatexenc, and unidecode, while native Python continues to use Requests normally.

The Worker also no longer waits for loadPyodide() to finish before requesting the local bundle. The bundle and Pyodide runtime start downloading together, and HTML preloads the bundle as early as possible. Streamed reads report actual downloaded bytes in the progress UI.

Validation

• Web unit tests cover streamed bundle progress and verify the bundle request starts before loadPyodide
• Chromium E2E performs a real DOI lookup with the 845,131-byte bundle and succeeds without contacting PyPI/pythonhosted
• CI builds the exact browser bundle and rejects it if it reaches 1 MB
• Python 3.10 and 3.13 tests verify the native Requests path remains functional
• pre-commit remains part of the required aggregate test workflow
• Codecov continues to receive separate Web and Python coverage uploads

Agent: ChatGPT
Model: GPT-5.6 Sol

[codecov]

Codecov Report

❌ Patch coverage is 97.91667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.56%. Comparing base (7d115f4) to head (b76c326).

Files with missing lines	Patch %	Lines
wenxian/feeder/semanticscholar.py	77.77%	2 Missing ⚠️
wenxian/from_identifier.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
+ Coverage   95.41%   95.56%   +0.14%     
==========================================
  Files          18       18              
  Lines        1200     1285      +85     
==========================================
+ Hits         1145     1228      +83     
- Misses         55       57       +2     

Flag	Coverage Δ
python	94.37% <82.35%> (-0.16%)	⬇️
web	99.35% <100.00%> (+0.21%)	⬆️

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