hyprland: update theme config`

configs/hyprland/hypr/theme.conf

+$hyprcursor_theme = rose-pine-hyprcursor
+$xcursor_theme = rose-pine
+$cursor_size = 24
+
 #---------- Hyprcursor
-env = HYPRCURSOR_THEME, rose-pine-hyprcursor
-env = HYPRCURSOR_SIZE, 24
+env = HYPRCURSOR_THEME, $hyprcursor_theme
+env = HYPRCURSOR_SIZE, $cursor_size
 
 #---------- XCursor
-env = XCURSOR_THEME, Adwaita
-env = XCURSOR_SIZE, 24
+env = XCURSOR_THEME, $xcursor_theme
+env = XCURSOR_SIZE, $cursor_size
+
+exec = printf 'Xcursor.theme: $xcursor_theme\nXcursor.size: $cursor_size\n' | xrdb -merge
 
 #---------- QT
-env = QT_STYLE_OVERRIDE, kvantum
\ No newline at end of file
+env = QT_STYLE_OVERRIDE, kvantum
+env = QT_QPA_PLATFORMTHEME, xdgdesktopportal