Honor sizing-probe verdicts in height emission; pin lottie mount heights

- heightFlows() bails when the capture probe proved a height authored-
  explicit (hAuto=false, hFill=false), so circular parent/child flow
  reasoning can no longer drop 100vh heroes to 0px; the probe verdict now
  vetoes the drop through both OR'd paths at the call site
- Space-distributing flex columns (space-between/around/evenly, center,
  flex-end) disqualify the content-driven read - the box height is load-
  bearing for the distribution
- Lottie mounts pin their captured per-viewport height like other replaced
  content, so aspect-fit runtime svgs can't inflate past the captured box
- DittoLottie forwards the placeholder's data-cid onto the runtime svg/
  canvas so the media stays addressable after the swap

240 tests pass (9 new), typecheck clean.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

compiler/src/generate/app.ts

@@ -2539,7 +2539,10 @@ export function generateApp(input: GenerateInput, tokensCss: string): { pageTsx:
   const mode = input.humanizeMode ?? "tailwind";
   // Tailwind mode (default): translate each node's exact decls to utility classes.
   // CSS mode: dedup into shared semantic CSS classes. Both fidelity-neutral.
-  const tw = humanize && mode === "tailwind" ? buildTailwind(ir, assetMap, input.colorVar, { interaction: input.interaction, reflow: input.reflow }) : undefined;
+  // Lottie mount boxes are pinned to their captured height (replaced-like) so the runtime player's
+  // aspect-sized svg fills a definite box instead of inflating. The spec item cid IS the mount cid.
+  const lottieMounts = new Set(lottieSpec.items.map((it) => it.cid));
+  const tw = humanize && mode === "tailwind" ? buildTailwind(ir, assetMap, input.colorVar, { interaction: input.interaction, reflow: input.reflow, lottieMounts }) : undefined;
   const classMap = humanize && mode === "css" ? buildClassMap(ir, assetMap, input.colorVar, input.primitives, input.tokenResolver) : undefined;
   const cleanRecipeClass = recipeResponsiveClassCleaner(ir, input.recipeReport, { tailwind: !!tw });
   const classOf = tw ? (cid: string) => cleanRecipeClass(cid, tw.classOf.get(cid)) : classMap ? (cid: string) => classMap.classOf.get(cid) : undefined;