fix(liveview): allow zoom-out to 0.25 so large infra fits

View-only mode set no minZoom, so React Flow defaulted to 0.5 and big
canvases couldn't zoom out far enough to fit. Match the editor's bounds
(minZoom 0.25, maxZoom 2.5). Add a regression test asserting the props.

ha-relevant: maybe

frontend/src/components/LiveView.tsx

@@ -158,6 +158,8 @@ function LiveViewCanvas() {
         elementsSelectable={false}
         panOnDrag
         zoomOnScroll
+        minZoom={0.25}
+        maxZoom={2.5}
         colorMode={theme.colors.reactFlowColorMode}
         connectionMode={ConnectionMode.Loose}
         onNodeClick={onNodeClick}