test: refresh visual baselines after the View Source change (#453)

[mmcky]

Refreshes the Playwright baselines so they match what the fixtures site renders today. They were regenerated by /update-snapshots, the first run with #456's --update-snapshots=all fix, against fixtures 0048d10, and the bot's re-run confirmed they reproduce.

What changed (39 files)

I diffed every old and new baseline pixel by pixel and looked at crops of each kind of change. Nothing is unexplained:

Change	Files	Cause
Toolbar loses the GitHub icon; the other icons shift right by one slot	toolbar.png and 27 full-page shots (both devices, dark-mode.png included)	#453. The fixtures set no repository_url, so the View Source button is no longer rendered. Each file's change is the same: desktop x 959–1250 / y 15–34, mobile x 265–370 / y 15–34
Byline: "QuantEcon" becomes "Thomas J. Sargent and John Stachurski", and "Translated by Jane Doe and John Roe" appears	intro.png, intro-sidebar.png (both devices); also the header of every full-page shot. On desktop math.png and admonitions.png it makes the page 3 px taller	Stale since #431 re-pinned the fixtures to the byline demo. It was within tolerance, so the old changed-mode bot never captured it
Glyph-edge anti-aliasing only, with identical colours	desktop bold-text-dark.png, italic-text-dark.png	Chromium rendering drift since these were last generated in #390 (May)
PNG bytes only, with pixel-identical images	mobile bold-text, italic-text, their dark variants, code-block	Re-encoded by the current Playwright. Harmless, and they now match what future runs write

CI

On the empty commit pushed after the bot's commit, everything passes: the visual job had 103 passed, 3 skipped, and 0 flaky.

Unrelated flakiness still there

Math-heavy pages still sometimes render at a different height, and a size mismatch fails toHaveScreenshot whatever the tolerance. This existed before this PR and the refresh doesn't fix it:

• main's CI for the ci: make /update-snapshots regenerate all baselines again #456 merge (f43b75d) failed visual on desktop math: baseline 3006 px, received 2939–2942 px on every retry.
• This PR's first run (empty starter commit, same code as main) failed mobile long-page (5911 vs 5901–5902 px) and mobile "math equation rendering".
• The bot's render of mobile long-page was 5911 px, matching the old baseline, so the height varies from run to run rather than having changed.

So one clean run here doesn't show the flakiness is gone. Tracked in #463, which traces it to MathJax sizing math before the web font has loaded.

No CHANGELOG entry, since a baseline refresh isn't user-facing.

🤖 Generated with Claude Code

[github-actions]

🚀 Deployed on https://6ac85319b3f60c739d864cb0--hungry-lovelace-7d0512.netlify.app

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@11d4b12). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #457   +/-   ##
=======================================
  Coverage        ?   59.48%           
=======================================
  Files           ?        2           
  Lines           ?      548           
  Branches        ?        0           
=======================================
  Hits            ?      326           
  Misses          ?      222           
  Partials        ?        0           

Flag	Coverage Δ
pytests	59.48% <ø> (?)

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[github-actions]

🎭 Visual Regression Test Results

 103 passed
 3 skipped

Details

 106 tests across 1 suite
 3 minutes, 52 seconds
 6094c26

Skipped tests

desktop-chrome › theme.spec.ts › Visual Regression Tests › prob-matrix - full page screenshot
mobile-chrome › theme.spec.ts › Visual Regression Tests › prob-matrix - full page screenshot
mobile-chrome › theme.spec.ts › Theme Features › f-string interpolation styling

[mmcky]

/update-snapshots

[github-actions]

✅ Regenerated visual snapshots and committed 39 changed file(s) to this PR.

Built against fixtures QuantEcon/quantecon-book-theme-fixtures@0048d104ed1afa587b824d130e5210dc969713c5.

✅ Re-ran the suite against the new baselines — they reproduce.

📦 Download snapshot-update-diff artifact for the regenerated images; this PR's Files changed tab shows each one before and after.

⚠️ The commit was pushed with GITHUB_TOKEN, which does not trigger workflows — push an empty commit to re-run CI against the new baselines. (Set a SNAPSHOT_BOT_TOKEN secret to make this automatic.)

[Copilot]

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