fix(runtime-vapor): preserve slot-owner css vars for teleported slot content

[edison1105]

close #14473

Summary by CodeRabbit

• Bug Fixes

  • Improved scope owner detection for teleported components, ensuring proper context preservation for slot content.
  • Enhanced CSS variable handling and propagation when using teleport fragments.

• Tests

  • Added comprehensive tests for CSS variable behavior across conditional branches combining teleports with slot components.

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@vue/compiler-core

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commit: e1e913e

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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	86.4 kB	30.2 kB	26.6 kB
runtime-dom.global.prod.js	110 kB	41.6 kB	37.3 kB
vue.global.prod.js	169 kB	61.4 kB	54.8 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	50.3 kB	19.7 kB	17.9 kB
createApp	59.3 kB	23 kB	20.9 kB
createApp + vaporInteropPlugin	82.3 kB	30.5 kB	27.7 kB
createVaporApp	28.6 kB	11.1 kB	10.2 kB
createSSRApp	63.5 kB	24.7 kB	22.5 kB
createVaporSSRApp	32 kB	12.4 kB	11.3 kB
defineCustomElement	65.3 kB	24.8 kB	22.5 kB
defineVaporCustomElement	38.9 kB	14.4 kB	13.2 kB
overall	74.2 kB	28.3 kB	25.7 kB