fix(css): sync pagination-margin-start calc with Bootstrap 5.3 (#5951)

Bootstrap changed calc order from `calc(var * -1)` to `calc(-1 * var)`,
which caused pagination border-radius condition to fail, making all
pagination buttons rounded instead of grouped.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dist/css/adminlte.css

@@ -4757,10 +4757,15 @@ textarea.form-control-lg {
 }
 
 .page-item:not(:first-child) .page-link {
-  margin-left: calc(var(--bs-border-width) * -1);
+  margin-left: calc(-1 * var(--bs-border-width));
+}
+.page-item:first-child .page-link {
+  border-top-left-radius: var(--bs-pagination-border-radius);
+  border-bottom-left-radius: var(--bs-pagination-border-radius);
 }
-.page-item .page-link {
-  border-radius: var(--bs-pagination-border-radius);
+.page-item:last-child .page-link {
+  border-top-right-radius: var(--bs-pagination-border-radius);
+  border-bottom-right-radius: var(--bs-pagination-border-radius);
 }
 
 .pagination-lg {

dist/css/adminlte.rtl.css

@@ -4755,10 +4755,15 @@ textarea.form-control-lg {
 }
 
 .page-item:not(:first-child) .page-link {
-  margin-right: calc(var(--bs-border-width) * -1);
+  margin-right: calc(-1 * var(--bs-border-width));
+}
+.page-item:first-child .page-link {
+  border-top-right-radius: var(--bs-pagination-border-radius);
+  border-bottom-right-radius: var(--bs-pagination-border-radius);
 }
-.page-item .page-link {
-  border-radius: var(--bs-pagination-border-radius);
+.page-item:last-child .page-link {
+  border-top-left-radius: var(--bs-pagination-border-radius);
+  border-bottom-left-radius: var(--bs-pagination-border-radius);
 }
 
 .pagination-lg {

src/scss/_bootstrap-variables.scss

@@ -1312,7 +1312,7 @@ $pagination-color:                  var(--#{$prefix}link-color) !default;
 $pagination-bg:                     var(--#{$prefix}body-bg) !default;
 $pagination-border-radius:          var(--#{$prefix}border-radius) !default;
 $pagination-border-width:           var(--#{$prefix}border-width) !default;
-$pagination-margin-start:           calc(#{$pagination-border-width} * -1) !default; // stylelint-disable-line function-disallowed-list
+$pagination-margin-start:           calc(-1 * #{$pagination-border-width}) !default; // stylelint-disable-line function-disallowed-list
 $pagination-border-color:           var(--#{$prefix}border-color) !default;
 
 $pagination-focus-color:            var(--#{$prefix}link-hover-color) !default;