fix(editor): correct cursor position after image uploaded

[robertu7]

• correct cursor position after image uploaded
• add <figcaption> placeholder to prevent UI relayout after image uploaded
• remove unused;

ref:

• PR-2408-1-23

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Name	Status	Preview	Comments	Updated (UTC)
matters-web	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 6, 2024 3:56pm