feat: refactor syntax higlighting support in edit.elf/Text Editor, add highlighting for html, css, js

programs/src/texteditor/main.cpp

@@ -2,7 +2,7 @@
  * main.cpp
  * MontaukOS Text Editor - standalone Window Server app
  * Single-buffer text editor with line numbers, cursor, scrolling, file I/O,
- * syntax highlighting for C, C++ and Lua files
+ * syntax highlighting for C, C++, Lua, HTML, CSS and JS files
  * Copyright (c) 2026 Daniel Hammer
  */