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/message.css

@@ -70,7 +70,6 @@ details.ui.message:not(:has(pre)) summary {
 .ui.blue.message,
 .ui.attached.blue.message {
   background: var(--color-info-bg);
-  color: var(--color-info-text);
   border-color: var(--color-info-border);
 }
 
@@ -79,7 +78,6 @@ details.ui.message:not(:has(pre)) summary {
 .ui.positive.message,
 .ui.attached.positive.message {
   background: var(--color-success-bg);
-  color: var(--color-success-text);
   border-color: var(--color-success-border);
 }
 
@@ -89,14 +87,12 @@ details.ui.message:not(:has(pre)) summary {
 .ui.negative.message,
 .ui.attached.negative.message {
   background: var(--color-error-bg);
-  color: var(--color-error-text);
   border-color: var(--color-error-border);
 }
 
 .ui.warning.message,
 .ui.attached.warning.message {
   background: var(--color-warning-bg);
-  color: var(--color-warning-text);
   border-color: var(--color-warning-border);
 }