fix(runtime-vapor): add dev-only warning for non-existent property access during render

[edison1105]

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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	85.2 kB	29.9 kB	26.4 kB
runtime-dom.global.prod.js	108 kB	40.5 kB	36.4 kB
vue.global.prod.js	166 kB	60.5 kB	53.8 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	48 kB	18.8 kB	17.1 kB
createApp	57 kB	21.9 kB	20 kB
createApp + vaporInteropPlugin	95.4 kB	35.2 kB	31.7 kB
createVaporApp	40.6 kB	15.1 kB	13.7 kB
createSSRApp	61.4 kB	23.7 kB	21.6 kB
defineCustomElement	63.1 kB	23.8 kB	21.7 kB
overall	72.1 kB	27.3 kB	24.9 kB

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commit: 83eb7bd

[Copilot]

Pull request overview

This PR adds a development-only warning to the runtime-vapor implementation that alerts developers when they access non-existent properties during component render. This matches similar functionality in the non-vapor runtime and helps catch common errors during development.

Key changes:

• Added createDevSetupStateProxy function that wraps the setup state with a proxy in dev mode to detect and warn about undefined property access
• Added test coverage to verify the warning is triggered correctly
• Fixed an existing test that was accessing a non-existent property (style) which would now trigger the new warning

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/runtime-vapor/src/component.ts	Implements dev proxy wrapper for setup state to warn on non-existent property access; adds imports for toRaw and hasOwn utilities
packages/runtime-vapor/tests/component.spec.ts	Adds test case to verify warning is triggered when accessing non-existent properties during render
packages/runtime-vapor/tests/hmr.spec.ts	Removes reference to non-existent style property from test template to avoid triggering the new warning

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