fix(popup): dismiss empty create editor on click-away

[kduncanhsu]

Summary

• Dismiss a staged region, drawing, or highlight when the user clicks away from an empty PopupV2 create editor.
• Keep the staged annotation and draft when the editor has in-progress text (including mentions). Starting a new mark (annotation) of the same type still replaces the stage.
• Builds on fix(region): persist staged region annotation on click-away #770: region abort still does not wipe a staged draft; empty dismiss is owned by PopupV2.

Test plan

• Region: draw a box, leave the comment empty, click the page → region and editor dismiss
• Region: draw a box, type a comment, click the page → region and comment stay
• Drawing: add a comment, leave it empty, click the page → drawing and editor dismiss
• Drawing: type a comment, click the page → drawing and comment stay
• Highlight: stage a highlight, leave the comment empty, click away (no new selection) → highlight and editor dismiss
• Highlight: type a comment, click away → highlight and comment stay
• All types: start a new mark of the same type → previous stage is replaced
• Click inside the editor or mention UI → does not dismiss

Made with Cursor

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[JChan106]

Any way to test that reset creator is not called if there is text?

[JChan106]

Any type we can use instead of unknown?

[zhirongwang]

I think it's worth to have another to polish the highlight annotation popup too.

• highlight some text and popup appear, type some string, click on blank area in the pdf, the pop up disappear.