chore: release v0.2.10

[dholbach]

Version bump to v0.2.10 (all three version strings) + docs pass.

Included since v0.2.9:

• feat: fillable intake form PDF + send-by-email from onboarding #200 fillable intake form PDF + send-by-email from onboarding
• feat: sync no-next-session tag directly from calendar fetch #199 instant no-next-session tag sync from calendar fetch
• fix: point expired-token hint at ./dev.py calendar-auth #197 expired-token hint → ./dev.py calendar-auth
• feat: track annual tax settlement (Steuerbescheid) on /reports/tax-quarter/ #196 tax settlement (Steuerbescheid) tracking
• i18n: resolve fuzzy de-catalog entries (dashboard action labels showed English) #189 de.po fuzzy fix (dashboard labels fell back to English)
• fix: resolve review issues #181-#187 #188 billing-guard fixes, refactors, CODE_STRUCTURE.md rewrite

After merge:

git tag v0.2.10 && git push origin v0.2.10
gh release create v0.2.10 --title "v0.2.10" --notes "See docs/CHANGELOG.md"

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