fix: Small post-General interest cleanup

[evan10s]

Fixes several small things from recent feedback:

• Update to AGP 8.6.0 / Gradle 8.9
• Log more invalid NFC taps as warnings so more info is sent to Sentry
• Cleanup variable name in NFC handler for clarity (desfireEV1 -> desfire)
• The events list for attendance is now sorted by start date in descending order. Events where the start date is null sort to the bottom
• Uses new endpoint to get details for just the selected merch item on the distribution screen
• Better error handling for the edge case where a merch item becomes undistributable between the time the list of merch items is loading and when the item is selected:

• I prefixed my PR title with the change type, generally feat: or fix: (e.g., feat: Add merchandise distribution)
• Make sure sentry works in a release build
  Closes Improve attendance events list ordering #55

[github-actions]

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