Fix color regressions, add priority color (#37417)

- fix markup attention block regressions on 2 colors
- added new color "priority" color for important severity in markup
- all message-box style, and error form elements use monochrome text
- tweaked and improved action logs colors

Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>

web_src/css/modules/input.css

@@ -38,7 +38,7 @@
 .ui.input.error > input {
   background: var(--color-error-bg);
   border-color: var(--color-error-border);
-  color: var(--color-error-text);
+  color: var(--color-input-text);
 }
 
 .ui.icon.input > i.icon {