text: Improve accuracy and performance of caret placement in text #26306

Job	Run time
Paths filter	6s
Build for browser tests	2m 10s
Test Node.js 20 / ubuntu-24.04	4m 1s
Test Node.js 20 / windows-latest	4m 57s
Test in ${{ matrix.browser }}	0s
Test Node.js 22 / ubuntu-24.04	4m 4s
Test Node.js ${{ matrix.node_version }} / ${{ matrix.os }}	0s
Test Node.js 22 / windows-latest	6m 18s
Test in chrome	1m 41s
Test in firefox	2m 54s
Test in edge	2m 27s
	28m 38s

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