feat: changelog — render markdown links, collapse older releases, fix date parsing

[Copilot]

Changelog items were displaying raw markdown syntax ([#79](url)) as literal text, and all releases were rendered at once making the tab overwhelming.

Changes

Markdown link rendering (src/js/08-static-renders.js)

• Added mdLinksToHtml() that converts [text](url) patterns to <a> tags; only https?:// URLs are linked, everything else falls back to escaped text

Truncated display with expand/collapse (src/js/08-static-renders.js, styles/content-pages.css)

• Only the latest release renders expanded by default
• Older releases hidden behind a "Show N older releases ↓" toggle button
• Each release header gets a "View on GitHub ↗" link for quick access to full release notes

Date parsing fix (scripts/build-changelog.js)

• Release-please writes ## [1.5.0](url) (2026-04-26) rather than ## [1.5.0] - 2026-04-26; the regex now handles both formats, so dates were previously always null

Tests (tests/script.test.js)

• 6 new unit tests covering: link rendering, non-https URL safety (no href="javascript:"), button presence, expand/collapse toggle, and single-release edge case

Example of what a changelog item now looks like rendered:

add anchor links ([#79](…)) ([322f8f5](…))
→ add anchor links <a href="…">#79</a> <a href="…">322f8f5</a>

Summary by CodeRabbit

• New Features

  • Added collapsible "older releases" section in changelog with toggle button for better organization.
  • Improved markdown link handling for GitHub references.
  • Enhanced changelog parsing to support additional format variants.

• Style

  • Added styling for changelog UI elements including GitHub links and show more button.

• Tests

  • Expanded test coverage for changelog rendering and link conversion behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d3bc0905-39ef-4f73-ac63-3fc4df6e857d

📥 Commits

Reviewing files that changed from the base of the PR and between 9da8e57 and 1796b22.

📒 Files selected for processing (4)

• scripts/build-changelog.js
• src/js/08-static-renders.js
• styles/content-pages.css
• tests/script.test.js

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📝 Walkthrough

Walkthrough

Fool, listen up! This PR be fixing up the changelog parsing to recognize both Keep-a-Changelog and release-please formats with optional URLs and flexible date placement! And I pity the fool who don't appreciate the new changelog rendering with markdown link support, a toggle for older releases, and fresh CSS styling to make it look fly!

Changes

Cohort / File(s)	Summary
Changelog Parsing scripts/build-changelog.js	Extended regex pattern to recognize both Keep-a-Changelog and release-please header variants, supporting optional (url) and flexible date placement (after dash or in parentheses), with date field falling back to null if neither date format matches.
Changelog Rendering src/js/08-static-renders.js	Introduced mdLinksToHtml helper to safely convert markdown inline links (https?://) to HTML anchors, and buildReleaseHtml to centralize release card generation. Refactored renderChangelog() to display only latest release with toggle button and collapsible older releases container.
Changelog Styling styles/content-pages.css	Added CSS classes for GitHub links (muted appearance with hover transitions), changelog item anchors (accent-based styling), show-more toggle (dashed border, mono typography), and older releases container (flex layout with gap spacing).
Changelog Tests tests/script.test.js	Replaced script containment check with markdown link rendering tests covering PR/commit link conversion to GitHub anchors, javascript: link prevention, and older releases toggle behavior (button visibility, container state, repeated click handling).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically summarizes the three main changes: markdown link rendering, older release collapsing, and date parsing fixes—all of which are present and documented in the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch copilot/update-changelog-display

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[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9da8e57) to head (1796b22).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #83   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          242       242           
  Branches       109       109           
=========================================
  Hits           242       242           

Flag	Coverage Δ
unit	100.00% <ø> (ø)

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