fix: image caption bug

[Saul-Mirone]

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Summary

Image caption can not be continually input Image caption will throw selection error

How did you test this change?

E2E and manually

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
milkdown-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 18, 2024 7:41am

[nx-cloud[bot]]

☁️ Nx Cloud Report

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[cypress[bot]]

Passing run #893 ↗︎

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Merge 1a8cc7a610ac862818383c1fbd1101fdf592625d into cd775ddd03f75180e12c2ae8f3dc...
Project: Default Project	Commit: 67aa3f2e8c ℹ️
Status: Passed	Duration: 01:46 💡
Started: Jun 18, 2024 7:46 AM	Ended: Jun 18, 2024 7:47 AM

Review all test suite changes for PR #1382 ↗︎

[cypress[bot]]

Passing run #894 ↗︎

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Details:

fix: image caption bug (#1382)
Project: Default Project	Commit: f89aa0eaf7
Status: Passed	Duration: 01:37 💡
Started: Jun 18, 2024 7:51 AM	Ended: Jun 18, 2024 7:53 AM

Review all test suite changes for PR #1382 ↗︎