Fix 422986

[JiuqingSong]

Bug 422986: Re: Monarch Feedback 🎁 - Formatting issues with bullet points in emails

This is because when copy from copilot, if the selection is in a list, copilot will copy <li> without <ol> or <ul> wrapper, causes Content Model uses GeneralElement to represent it. When paste, <li> will be put under an existing <li> makes double layer list item, which is not allowed by HTML.

Fix: When seeing <li> without wrapper, always assume there is a <ul> around it so we can use ListItem to represent this <li>

[Copilot]

Pull request overview

This PR addresses a paste-formatting bug where copied HTML may contain standalone <li> elements without a surrounding <ul>/<ol>, leading to invalid list nesting and incorrect Content Model representation during paste.

Changes:

• Update listItemProcessor to always create a ListItem model for <li> elements, defaulting to a UL level when no list context exists.
• Update WAC paste tests and DOM-to-model list item processor tests to expect ListItem output instead of General elements for standalone <li> scenarios.
• Fix typos in test case names.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
packages/roosterjs-content-model-plugins/test/paste/word/processPastedContentFromWacTest.ts	Updates paste expectations for standalone <li> cases to produce ListItem models / <ul> output.
packages/roosterjs-content-model-dom/test/domToModel/processors/listItemProcessorTest.ts	Updates unit tests to reflect new ListItem behavior when <li> lacks list context.
packages/roosterjs-content-model-dom/lib/domToModel/processors/listItemProcessor.ts	Changes <li> processing to synthesize list context and always emit ListItem.

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