feat(suite): Enhance HiddenPlaceholder using special font

[Lemonexe]

Discreet mode currently leaves numerical values blurred, but technically still possible to decypher.
Enhance it to actually replace every number with $, making them completely illegible.

🚧 PROOF OF CONCEPT 🚧

Description

• JS approach has been tried in #13914 (complex, messy code, unreliable),
• this time try it with only CSS using font-family.
• special font was prepared using the free online tool Glyphr Studio
• the font simply has ever digit replaced with $

Disadvantage: we still show number of digits..

ℹ️ I chose $ because it's narrower than # or &, but still it's not an ideal pick, you can see that the line height is higher, so all content expands down 🙈
Maybe I messed up something in Glyphr Studio, but idk, this is just PoC! I can later perfect it using * maybe?

Related Issue

Resolve #10567

Screenshots:

Video shows behavior with hover:

HiddenPlaceholder.with.special.font.webm

[Lemonexe]

Closing, because creating the special font would be too much work if we want to look consistent (this was just a demo, kinda broken).
The font was created by an external partner, and we'd have to contract them again for it.

Will focus on JS solution.