Fix delete color and contrast

web/static/style.css

@@ -8,7 +8,11 @@
   --line: #dcdcd5;
   --accent: #2f6f4f;
   --accent-fg: #ffffff;
+  /* Red reads as text and as a button surface, and one value cannot do both:
+     see the pair below, kept in step per theme. */
   --danger: #9b2c2c;
+  --danger-bg: #991b1b;
+  --danger-fg: #ffffff;
   --warn-bg: #fdf6e3;
   --radius: 10px;
 }
@@ -23,6 +27,8 @@
     --accent: #5fae86;
     --accent-fg: #10241a;
     --danger: #e07070;
+    --danger-bg: #d32f2f;
+    --danger-fg: #ffffff;
     --warn-bg: #2a2418;
   }
 }
@@ -112,7 +118,7 @@ button, .button {
   text-decoration: none;
 }
 button:disabled { opacity: .55; cursor: default; }
-button.danger { background: var(--danger); color: #fff; }
+button.danger { background: var(--danger-bg); color: var(--danger-fg); }
 
 .progress .bar {
   height: .5rem;