Release v0.2.2

[natolambert]

Cuts v0.2.2 (all changes accumulated under [Unreleased] since v0.2.1).

• Bump version to 0.2.2 in pyproject.toml, colloquium/__init__.py, and uv.lock
• Roll [Unreleased] changelog items into a dated ## [0.2.2] - 2026-06-19 section

Changes in this release

• Make slide text easier to get out: click-drag/selection no longer advances the slide, and press c to copy the current slide's markdown source to the clipboard (#37)
• Fix title: center leaking center alignment to the whole slide body, and citation author surnames (#36)
• Fix block animations for generated div-based elements (#33)
• Bind dev server to loopback, change default port to 8090, and error on port conflicts (#28)
• Upgrade locked Pillow to 12.2.0 (CVE-2026-40192) (#29)
• Upgrade locked pytest to 9.0.3 and Pygments to 2.20.0 (CVE-2025-71176, CVE-2026-4539) (#30)
• Upgrade locked lxml to 6.1.0 (CVE-2026-41066) (#31)
• Add a built-in iframe element for embedding external or local HTML content (#32)
• Add fragment-based animations: <!-- animate: bullets|blocks --> and <!-- step --> (#25)
• Hide the mobile slide picker trigger when decks are embedded in iframes (#35)
• Add <!-- after: references --> for post-reference appendix slides (#34)

After merge: tag v0.2.2 on the merge commit, publish the GitHub release, and upload to PyPI.

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