Fix objectLimit to cap total objects globally, not per type

[zeppnyc]

Summary

Fixes the objectLimit prop on InteractiveGraphics so it caps the total number of rendered objects, instead of capping each object type bucket independently.

The bug

filterAndLimit in InteractiveGraphics.tsx applied slice(-objectLimit) to every object type bucket separately:

return objectLimit ? filtered.slice(-objectLimit) : filtered

There are 8 buckets (arrows, infiniteLines, lines, rects, polygons, circles, texts, points), so passing objectLimit={3} could still render up to 3 × 8 = 24 objects.

This contradicts both:

• The issue spec: "limits the number of objects displayed (after filters) on InteractiveGraphics".
• The existing red indicator UI: "Display limited to {objectLimit} objects. Received: {total}." — already assumes a single global cap.

Reproduces on the existing fixture examples/interactive-object-limit-layer-and-step-filtering.fixture.tsx: with objectLimit={3} and 7 objects in the graph (3 rects + 3 points + 1 circle), all 7 currently render while the red indicator says "Display limited to 3 objects. Received: 7.".

The fix

• New pure helper site/utils/applyObjectLimit.ts distributes the limit globally across all object buckets, filling backwards from the last bucket in render order. This preserves the previous "last N" semantic from slice(-objectLimit) — the most recently added objects survive.
• filterAndLimit no longer slices; the global limit is applied in a new limitedBuckets memo in InteractiveGraphics.tsx.
• totalFilteredObjects now reports the true pre-limit total, so the isLimitReached indicator triggers exactly when the limit is actually capping output.
• Render JSX reads from limitedBuckets instead of per-type filteredXxx memos.

Verification

• bun test → 71 pass (62 baseline + 9 new unit tests for applyObjectLimit covering: no-limit, zero-limit, total-below-limit, single-bucket cap, multi-bucket budget fill, full-drop semantics, immutability, equality-to-total, and in-bucket order preservation)
• bun run format:check → clean
• bunx tsc --noEmit → clean

/claim #42

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Project	Deployment	Actions	Updated (UTC)
graphics-debug	Ready	Preview, Comment	May 13, 2026 11:30am