fix(repeater): merge block render/form selections into jsxSelection

Rolldown DCE strips calls whose results are unused, even when passed to
external functions. Merge results into jsxSelection which is consumed
later, making the entire chain non-eliminable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: matej21

packages/bindx-repeater/src/components/BlockRepeater.tsx

@@ -245,10 +245,10 @@ blockRepeaterWithSelection.getSelection = (
 	const jsxSelection = collectNested(syntheticChildren)
 
 	// Call block render/form functions so the collector proxy records field accesses.
-	// Results are passed to collectNested to prevent bundler dead-code elimination.
+	// Collect JSX selections from block render/form output and merge into jsxSelection.
 	for (const blockDef of Object.values(props.blocks) as BlockDefinition[]) {
-		if (blockDef.render) collectNested(blockDef.render(collectorEntity as EntityAccessor<object>))
-		if (blockDef.form) collectNested(blockDef.form(collectorEntity as EntityAccessor<object>))
+		if (blockDef.render) mergeSelections(jsxSelection, collectNested(blockDef.render(collectorEntity as EntityAccessor<object>)))
+		if (blockDef.form) mergeSelections(jsxSelection, collectNested(blockDef.form(collectorEntity as EntityAccessor<object>)))
 	}
 
 	const nestedSelection = scope.toSelectionMeta()