Fix incorrect Memo length limit in B20 tooltip

[t0mw4lker]

What

Fix the B20 Memo tooltip to describe the actual 32-byte UTF-8 limit instead of a 32-character limit.

Why

The current tooltip says that memos can contain up to 32 characters:

app/demos/b20/lib/glossary.ts

Screen:

However, memoToBytes32() encodes the input with stringToHex() and rejects values exceeding 32 UTF-8 bytes:

app/demos/b20/lib/protocol.ts

Screen:

The Memo UI uses this same validation function for user input:

app/demos/b20/components/MemoModule.tsx

Screen:

Since UTF-8 characters can occupy multiple bytes, a 32-character string can exceed the 32-byte limit. The tooltip therefore does not accurately describe the implemented constraint.

Change

Update the tooltip from:

Notes can be up to 32 characters.

to:

Notes can be up to 32 UTF-8 bytes.

This makes the user-facing description match the actual validation performed by the demo.

[cb-heimdall]

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