Bump to 2.2.1

[rossigee]

Summary

Bump versionCode to 8 and versionName to "2.2.1".

This is a patch release for two fixes that landed after the v2.2.0 tag:

• Landscape (and some portrait) activity log viewport height (Give the activity log room on a short viewport #92)
• Thin the release checklist to only own what this repo controls (Keep Zapstore protocol out of this repository's checklist #94)

Prerequisites

• zapstore-publish v1.0.3 cut and @v1 repointed so the 30 s publish timeout + retry and the release_notes fallback doc are live for this publish.

Checklist (from AGENTS.md)

• Version bumped (build.gradle)
• CHANGELOG.md entry added (covers the two post-2.2.0 items)
• ./gradlew check green (BUILD SUCCESSFUL)
• On-device smoke (no behaviour change; the log height and docs-only changes are low risk)
• Merge via PR (not by author)
• Tag v2.2.1 only after merge
• Confirm publish step produced kind 3063 carrying the APK

Verification of version in artifact (after assemble)

After merge the release workflow will produce it; locally:

export JAVA_HOME=...
./gradlew assembleRelease
... aapt2 dump badging ... | grep ^package

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