docs: fix line breaks when copying commands from website

The MkDocs Material theme's anchor_linenums feature injects
<a id="__codelineno-*"> elements inside code line spans. Firefox on
Linux treats these as DOM selection boundaries, inserting line breaks
when users copy code from the documentation.

Fix by using display:contents on the anchor elements to remove them
from the rendering tree and user-select:none to exclude them from
copy selection. Also force display:inline on token-level spans.

Fixes: #482
Signed-off-by: Git-HimanshuRathi <himanshurathiwork@gmail.com>

Author: Git-HimanshuRathi

docs/assets/stylesheets/theme.css

@@ -129,6 +129,20 @@
   pointer-events: none;
 }
 
+/* =======================
+   Code Block Copy Fix
+   ======================= */
+.md-code__content a[id^="__codelineno"] {
+  display: contents !important;
+  user-select: none !important;
+  -moz-user-select: none !important;
+  pointer-events: none !important;
+}
+
+.md-code__content > span > span {
+  display: inline !important;
+}
+
 /* =======================
    General Typography (Optional)
    ======================= */