perf: speed up web startup and add progress

[njzjz-bot]

Summary

• stop loading Pyodide twice by removing the unused main-thread runtime
• stop downloading the unused sqlite3 Pyodide package
• preconnect to PyPI hosts used during cold start
• expose Worker initialization/query phases to the page
• show a 0–100% progress bar and disable duplicate submissions while a query is running
• add web unit tests, Chromium end-to-end coverage, and Codecov reporting

Why

The web app was paying most of its cold-start cost before the actual literature lookup: Pyodide was loaded once in the page and again in the Worker, then the Worker loaded an unused sqlite3 package. The query code itself is already asynchronous/concurrent for DOI sources, so startup is the largest straightforward optimization.

Progress stages

The Worker now reports runtime loading, package installer loading, wenxian installation, query preparation, literature-source lookup, and completion. The page renders these as an accessible progress bar rather than a static Fetching... message.

Web validation

The required test workflow now has a dedicated Web tests job. It runs nine Node-based browser/worker tests under c8, uploads coverage/lcov.info to Codecov with the web flag, and then launches a real headless Chromium against a local copy of docs/.

Current web coverage:

• overall lines/statements: 99.01%
• wenxian.js: 100%
• webworker.js: 100%
• pyworker.js: 95.55%

The Chromium smoke test performs a real DOI query for 10.1063/5.0155600, including Pyodide initialization, PyPI package loading, progress rendering, literature lookup, and BibTeX output validation. Python coverage is now explicitly uploaded with the separate python flag.

Agent: ChatGPT
Model: GPT-5.6 Sol

[codecov]

Codecov Report

❌ Patch coverage is 97.22222% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.31%. Comparing base (4fc6177) to head (967e23e).

Files with missing lines	Patch %	Lines
docs/pyworker.js	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   94.53%   95.31%   +0.78%     
==========================================
  Files          15       18       +3     
  Lines         969     1173     +204     
==========================================
+ Hits          916     1118     +202     
- Misses         53       55       +2     

Flag	Coverage Δ
python	94.53% <ø> (?)
web	99.01% <97.22%> (?)

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