fix(inspector): mirror x/y/w/h on text nodes

[chiefcll]

Summary

Two compounding bugs caused the Inspector's mirror <div> for CoreTextNode instances to ignore layout/transform updates. Setting textNode.x = 100 (or y, w, h, mountX, etc.) updated the canvas correctly but the DOM mirror stayed at its parent's origin, making the Inspector visually misleading for any app that uses text.

What was broken

Bug 1 — proxy walked only one level of the prototype chain.
createProxy looked up property descriptors with Object.getOwnPropertyDescriptor(node, …) then a single Object.getPrototypeOf(node) step. x / y / w / h / mountX / mountY / alpha / rotation / scale / color / clipping / zIndex are defined on CoreNode.prototype, which is two hops up from a CoreTextNode instance (since CoreTextNode extends CoreNode). The lookup returned undefined and the proxy returned early — no trap was installed for those properties on text nodes, so updates never reached the mirror div.

Bug 2 — createTextNode passed the wrong prop bag.
createDiv was called with node.textProps only (text/font/lineHeight/etc.). That bag has no x/y/w/h/mount*, so the mirror div's initial paint had no left/top and rendered at the parent's origin regardless of where the canvas drew the text.

Regular (non-text) CoreNode instances were unaffected because their prototype is CoreNode.prototype directly, and createNode already passes node.props.

Fix

• Walk the full prototype chain in createProxy until the descriptor is found or null is reached.
• Merge node.props and node.textProps in createTextNode so layout fields land in the initial createDiv call.

Test plan

• Open an example with the inspector enabled and a text node; confirm the mirror div starts at the same on-screen position as the canvas text.
• Mutate textNode.x, textNode.y, textNode.w, textNode.h at runtime; mirror div tracks.
• Set mountX: 0.5 / mountY: 0.5 on a text node; mount-offset math runs (updateNodeProperty branch at the bottom of the file).
• Regular (non-text) nodes still work — prototype walk is a superset of the old single-level lookup.
• pnpm build clean (verified locally).

Notes for the reviewer

• Latent edge case (not addressed here): if mountX/Y is set on a text node before the text has loaded, props.w/props.h are still undefined and the mount-offset math computes NaN. Pre-existing; worth a follow-up but out of scope for this fix.
• This bug has likely been silent since CoreTextNode was introduced — anyone using the Inspector to debug text positioning was getting incorrect mirror positions.

🤖 Generated with Claude Code