refactor: improve edit filename ui

[pdanpdan]

• remove the ugly black on white input not respecting the theme
• position the editing on top of the original title
• autogrow the size of the tab while editing

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Name	Status	Preview	Comments	Updated (UTC)
repl	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 13, 2023 7:53am

[sxzz]

Another bug: background is dislocation when the input is empty.

[pdanpdan]

Good points, fixed.