Encoding error when approving link during manual operation

[guillaume-duong-bib]

Describe the bug

NB: I stumbled upon this bug while investing #2887. I will most likely submit PRs for the both of them.

The function b64DecodeUnicode (plugins\magma\src\utils\utils.js) used in updateLink (plugins\magma\src\stores\operationStore.js) fails when some characters are present in the command. More characters may cause the error, but here's those I confirmed (will update this if necessary):

• dot .
• dollar $

Edit: since the root cause is atob() (I found out that Edge is a bit more talkative than Firefox while testing), I expect any string that is not a proper b64 string to fail.

Error triggered:
DOMException: String contains an invalid character (firefox)
DOMException: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded. (edge)

To Reproduce
Steps to reproduce the behavior:

1. In an operation started in manual mode, approve a link whose command contains a dot . (it needs to be present in the adversary, not edited in).

Expected behavior
The approval should not restrict supported characters differently than the characters usually supported in abilities.

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Firefox 125.0.3 (64-bit), Edge 124.0.2478.67 (Official build) (64-bit)

[github-actions]

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