Fix Amharic (Ethiopic) font via lib_ui

- Point lib_ui submodule to gittare/lib_ui (fix/amharic-font-rendering)
- Abyssinica SIL font and fallback in lib_ui. Fixes #30184, #30230
- README: Add Abyssinica SIL attribution

Made-with: Cursor

Author: gittare

.gitmodules

@@ -24,7 +24,7 @@
 	url = https://github.com/desktop-app/codegen.git
 [submodule "Telegram/lib_ui"]
 	path = Telegram/lib_ui
-	url = https://github.com/desktop-app/lib_ui.git
+	url = https://github.com/gittare/lib_ui.git
 [submodule "Telegram/lib_lottie"]
 	path = Telegram/lib_lottie
 	url = https://github.com/desktop-app/lib_lottie.git

README.md

@@ -59,6 +59,7 @@ Version **1.8.15** was the last that supports older systems
 * Range-v3 ([Boost License](https://github.com/ericniebler/range-v3/blob/master/LICENSE.txt))
 * Open Sans font ([Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0.html))
 * Vazirmatn font ([SIL Open Font License 1.1](https://github.com/rastikerdar/vazirmatn/blob/master/OFL.txt))
+* Abyssinica SIL font ([SIL Open Font License 1.1](https://software.sil.org/abyssinica/)) — Ethiopic/Amharic (via lib_ui)
 * Emoji alpha codes ([MIT License](https://github.com/emojione/emojione/blob/master/extras/alpha-codes/LICENSE.md))
 * xxHash ([BSD License](https://github.com/Cyan4973/xxHash/blob/dev/LICENSE))
 * QR Code generator ([MIT License](https://github.com/nayuki/QR-Code-generator#license))