[Bug]: Snippet title cannot contain `:`

Describe the bug

Snippets cannot include a : in their title. Doing so can cause inconsistent behavior because HTTP requests fail silently in the background without being reflected in the UI. This may also result in a snippet appearing to be saved when it actually isn’t, or disappearing entirely due to the invalid title.

To reproduce

App Version and Architecture

5.1.1

System info

-

Validations

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• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
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[antonreshetov]

This is not a bug.

In markdown storage, the snippet title is used as the file name, so reserved filesystem characters like : are not allowed.

What we should improve here is the UX: massCode needs to show a clear validation message / notification when reserved characters are used.