[rocketraman]

Rolls up the four open Renovate PRs into one change:

• Compose 1.12.1 → 1.12.2 (closes deps: update dependency org.jetbrains.compose to v1.12.2 #67)
• Gradle wrapper 9.8.1 → 9.8.2, with the new distribution checksum (closes deps: update gradle to v9.8.2 #68)
• kotlinx-serialization-json 1.11.0 → 1.12.0 (closes deps: update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.12.0 #69)
• TestBalloon 1.1.0 → 1.2.0 (closes deps: update testballoon to v1.2.0 #72)

Verification

• ./gradlew clean build passes on Gradle 9.8.2.
• The test result XML shows that all 237 tests ran: 0 failures, 0 errors, 0 skipped. The smoke test passed 13 checks and skipped 1, which is macOS-only.
• The build has 8 compiler warnings (deprecated LocalClipboardManager and painterResource(String), plus two redundant-check warnings). All of them are pre-existing: compiling the parent commit gives the same warnings at the same lines.