[FEATURE] Icon for OTP entries

[akopachov]

Problem Description
It would be nice to have icons for each OTP entry, based on issuer name

Proposed Solution
This icon set seems to be a good one.

Alternative Solutions
N/A

Additional Context
You may take a look at the authenticator I made as a reference if you would like (Svelte 5 + Electron). You will not be able to use it without special hardware, but still might be helpful in some parts.

[ansxuman]

Good suggestion @akopachov! I had planned to include it in the first build, but it kept getting delayed, so I decided to add it to the upcoming build instead.