bootstrapworld / codemirror-blocks / 41009853602

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Add a Playwright browser suite for what jsdom can't test

Drives the example page in Chromium: the delete-then-undo regression in the
page's own program and a long document, real trash-can drags, real typing at
the top level, and a matrix of 16 edit types done with real clicks, keys, drops
and the real clipboard, each undone and redone by keyboard. Run it with
npm run test:e2e; a CI job is added.

Native drag emulation only works reliably for large targets, so drags onto
blocks dispatch real DOM drag events in the page instead.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

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