feat: switch text to UTF-8; add Unicode key events, dead keys & Czech layout; fix numpad navigation; add NumLock support

programs/src/terminal/settings.cpp

@@ -479,9 +479,9 @@ static void handle_key(const montauk::abi::KeyEvent& key) {
         step_font_size(FONT_SIZE_STEP);
     } else if (key.ascii == '-') {
         step_font_size(-FONT_SIZE_STEP);
-    } else if (key.scancode == 0x48) {  // Up
+    } else if (montauk::nav_scancode(key) == 0x48) {  // Up
         select_theme(g_panel.theme_index - 1);
-    } else if (key.scancode == 0x50) {  // Down
+    } else if (montauk::nav_scancode(key) == 0x50) {  // Down
         select_theme(g_panel.theme_index + 1);
     }
 }