revert: "feat(text): expose trimmedHeight on text nodes (#30)"

[chiefcll]

Summary

Reverts #30. Removes the node.trimmedHeight getter, the trimmedHeight field on the loaded event payload, and the supporting calc in both renderers.

This reverts commit 965999b282851938f0a73ccd288acbf32350e2c7 exactly — 5 files, 69 deletions, mechanical inverse.

Why

trimmedHeight was introduced as a way for callers to tightly size a text node to its visible ink — e.g. node.h = payload.trimmedHeight after loaded so flexbox alignItems: 'center' would optically center the glyphs.

Investigation found two problems with the API as shipped:

1. The documented snippet doesn't work. set h() on CoreTextNode is overridden to set maxHeight instead of props.h — so node.h = payload.trimmedHeight is silently rewritten to node.maxHeight = trimmedHeight, which is a layout constraint, not a dimension. Result: a wasted re-layout invalidation, no change to the visible bounding box, and (worse) lines silently dropped when maxHeight < 2 × lineHeightPx.

2. It's the wrong tool for centering anyway. With the default textBaselineMode: 'optical' (or 'cap', or 'x'), the math already places the optical center of the text at lineHeightPx / 2 = node.h / 2. Dropping a text node into a parent and using mountY: 0.5 already perfectly centers the visible ink — no trimmedHeight needed, no API surface required.

For the rarer case of "I want the node's box to hug the ink" (tight chips/badges in a flex row), the right shape is a dedicated textBoxTrim prop modeled after CSS text-box-trim — explicit, declarative, and it can actually update the texture/baselines coherently. That's a future addition; not in this PR.

What stays

Nothing else from #30 had external users that we could find — grep for trimmedHeight after this revert returns no matches in src/, examples/tests/, or test/. Safe removal.

Test plan

• CI green (pnpm build, pnpm test, visual regression)
• Manual: existing text examples render identically (the renderer-internal value was never used by anything except the public getter/event)

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