Font selection is Unicode presentation-unaware

For example, `⏭` (U+23ED) does not have the Emoji_Presentation property, so it shouldn't render as an emoji by default unless requested with U+FE0F. However, we are not aware of this and present it as emoji by default. For example, in copyparty's audio player controls: <img width="193" height="63" alt="Image" src="https://github.com/user-attachments/assets/b82e6458-5dd8-4443-976a-8eb1db417bbc" /> Firefox: <img width="184" height="64" alt="Image" src="https://github.com/user-attachments/assets/2785ee18-cfec-42ba-9a99-1832ea6016e5" />