Improve Cursor rules

.cursor/rules/general.mdc

@@ -18,3 +18,5 @@ When working with this project, follow these rules:
 - When you need a delay, use `await delay(millis);` in an async function. If the current function is not async,
   make it async. The import is `<project>/frontend/src/utils/utils`.
 - When you complete your task, remove unused imports if there are any.
+- Follow DRY, SOLID, YAGNI and KISS principles.
+- Do NOT use old, outdated or deprecated APIs and functions.

.cursor/rules/ui.mdc

@@ -1,10 +1,8 @@
 ---
 alwaysApply: true
 ---
-
 When you work with UI:
 
 1. Use MDUI components as HTML elements with the name "mdui-***". In JSX/TSX use the same elements and props as in HTML.
-2. Do NOT dynamically create HTML if it's going to be loaded when the page loads, instead put it statically in the HTML.
 3. The supporting text slot for MDUI lists is "description".
 4. When working with lists/sets in states, use the "useImmer" hook.