fix(conditional): name checkbox branches after their options

Checkbox conditions store a combination in optionIds, but the branch
label only read optionId, so every checkbox branch was called
"Branch 1", "Branch 2" and so on, also in the names of its group and
buttons. The label now lists the options of the combination.

Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

Author: AndyScherzinger

src/components/Questions/QuestionConditional.vue

@@ -890,7 +890,10 @@ export default defineComponent({
 					this.triggerType,
 				)
 			) {
-				const optionIds = branch.conditions.map((c) => c.optionId)
+				// Checkbox conditions hold a combination of options
+				const optionIds = branch.conditions.flatMap(
+					(c) => c.optionIds ?? [c.optionId],
+				)
 				const optionTexts = optionIds
 					.map((id) => this.options.find((o) => o.id === id)?.text)
 					.filter(Boolean)