fix: IP replacer white text on light background in light mode

The MkDocs Material announce block inherits white text color from
footer styling. Explicitly set color: var(--md-default-fg-color) on
.ip-replacer to override the inherited white text.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: rorar

docs/stylesheets/extra.css

@@ -6,13 +6,16 @@
   margin: 0 2px;
 }
 
-/* IP Replacer — announcement bar below header */
+/* IP Replacer — announcement bar below header
+   The announce block inherits white text from MkDocs Material footer styling,
+   so we must explicitly set color to override it. */
 .ip-replacer {
   display: flex;
   align-items: center;
   gap: 0.6rem;
   padding: 0.35rem 1rem;
   background: var(--md-code-bg-color);
+  color: var(--md-default-fg-color);
   border-bottom: 1px solid var(--md-default-fg-color--lightest);
   font-size: 0.8rem;
   flex-wrap: wrap;