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- Recursive compound rendering: CompoundNode checks if children are themselves compound types (WHEN inside CHOICE) and renders them recursively. Added EIP_WHEN, EIP_OTHERWISE, DO_CATCH, DO_FINALLY to frontend COMPOUND_TYPES. - Edge z-ordering: edges are distributed to their containing compound and rendered after the background rect, so they're not hidden behind compound containers. - Error section sizing: normalize error handler node coordinates to start at (0,0), compute red tint background height from actual content with symmetric padding for vertical centering. - Toolbar as HTML overlay: moved from SVG foreignObject to absolute- positioned HTML div so it stays fixed size at any zoom level. Uses design system tokens for consistent styling. - Zoom: replaced viewBox approach with CSS transform on content group. Default zoom is 100% anchored top-left. Fit-to-view still available via button. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>