Visible mid-merge builds and dedup'd triggers (v0.9.12)

Deployment bundle: the prune protection for queued/running builds and the
manual-trigger dedup.

Co-Authored-By: Claude <noreply@anthropic.com>

build.gradle.kts

@@ -12,7 +12,7 @@ group = "de.hoennig"
 // bump at least the patch version for every deployment — and only then, not per commit —
 // so the UI footer (BuildProperties), --version and the release notes identify what is
 // actually running; a deployment bundles whatever was committed since the last one
-version = "0.9.11"
+version = "0.9.12"
 
 java {
     toolchain {