Textarea: slow pasting and lag during navigation with arrow keys

[cluster]

Describe the problem you discovered

There are 2 issues with the textarea (for content and for smartcontract).

• Pasting a long text can be very slow, so a "Paste" button has been added in the interface
• Navigation through a long text with arrow keys becomes laggy (>60 lines)

The workaround provided in this PR somehow fixes the problem for the pasting.
But the source of both problems seems to come from a bug in the bubbletea lib, see
charmbracelet/bubbletea#794

Describe the solution you'd like

Follow up on the 2 issues mentioned in the discussion and update the bubbletea dependency when the PR are merged

Epic

No response