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The prepareFlattenedInnerRoot function creates a wrapper div when inlining sub-compositions. This wrapper had no width/height, which broke CSS height:100% chains — any sub-composition using percentage heights with flexbox centering would collapse to 0px and render content at the top instead of centered. Read data-width/data-height from the inner root and set matching pixel dimensions on the wrapper's inline style. Applied in both the compiler (server-side bundling) and the runtime (browser-side composition loader). Adds a producer regression test with a centered card sub-composition that fails without this fix.