Port the timeout fixes from PR #351 that resolved the unit-test CI
timeouts. Add HEAVY_TEST_TIMEOUT_MS (30s) in tests/helpers/test-utils.ts
and apply it to the slow gold-preview.fig fixture tests/hooks:
- clipboard roundtrip
- group reclassification
- glyph blob preservation
- auto-layout text measurement
- render/canvas/cache
- Deduplicate plugin data and relaunch data during .fig parsing/export
- Unify shared plugin data into the pluginData storage path
- Refactor shadow rendering and harden CanvasKit font provider teardown
- Expand engine and renderer coverage
- Scope hover hit-test to current page (was searching all pages including
internal component page, causing ghost hover outlines)
- Frames/sections without visible fills or strokes are click-through
- Groups are always click-through (only children are hittable)
- Clipping parents reject hits outside their bounds
- Instances/components check children before falling back to fill check
- Switch test fixtures from material3.fig (55MB) / nuxtui.fig (82MB) to
gold-preview.fig (537KB) for fast dev runs, gate heavy fixtures behind
BUN_HEAVY_TESTS env var (enabled in CI)
