fix(codebase audit): preserve cleanup without regressions

Fix codebase audit regressions while preserving UI/UX behavior and adding review-driven hardening.

src/components/board-buttons/board-buttons.module.css

@@ -6,7 +6,8 @@
   margin-bottom: 7px;
 }
 
-.mobileBoardButtons button {
+.mobileBoardButtons button,
+.mobileBoardButtons a[class~='button'] {
   text-transform: capitalize;
   margin: 5px 2px;
 }
@@ -33,7 +34,7 @@
   cursor: not-allowed !important;
 }
 
-.mobileBoardButtons a, .desktopBoardButtons a {
+.mobileBoardButtons a:not([class~='button']), .desktopBoardButtons a:not([class~='button']) {
   all: unset;
 }
 
@@ -147,4 +148,4 @@
   .mobileBoardButtons {
     display: none;
   }
-}
+}