fix(base): pin selection bar to viewport with Confluence-style dark pill

apps/client/src/features/base/components/grid/selection-action-bar.tsx

@@ -1,5 +1,5 @@
 import { memo } from "react";
-import { ActionIcon, Button, Transition } from "@mantine/core";
+import { Transition } from "@mantine/core";
 import { IconTrash, IconX } from "@tabler/icons-react";
 import { useTranslation } from "react-i18next";
 import { useRowSelection } from "@/features/base/hooks/use-row-selection";
@@ -23,28 +23,27 @@ export const SelectionActionBar = memo(function SelectionActionBar({
     <Transition mounted={isOpen} transition="slide-up" duration={150}>
       {(styles) => (
         <div className={classes.selectionActionBarWrapper} style={styles}>
-          <div className={classes.selectionActionBar}>
+          <div className={classes.selectionActionBar} role="toolbar">
             <span className={classes.selectionActionBarCount}>
               {t("{{count}} selected", { count: selectionCount })}
             </span>
-            <Button
-              size="xs"
-              color="red"
-              variant="light"
-              leftSection={<IconTrash size={14} />}
-              loading={isPending}
+            <button
+              type="button"
+              className={classes.selectionActionBarDelete}
+              disabled={isPending}
               onClick={() => void deleteSelected()}
             >
+              <IconTrash size={14} />
               {t("Delete")}
-            </Button>
-            <ActionIcon
-              size="sm"
-              variant="subtle"
+            </button>
+            <button
+              type="button"
+              className={classes.selectionActionBarClose}
               onClick={clear}
               aria-label={t("Clear selection")}
             >
               <IconX size={14} />
-            </ActionIcon>
+            </button>
           </div>
         </div>
       )}

apps/client/src/features/base/styles/grid.module.css

@@ -376,28 +376,85 @@
 }
 
 .selectionActionBarWrapper {
-  position: sticky;
-  bottom: 16px;
+  position: fixed;
+  left: 50%;
+  bottom: 24px;
+  transform: translateX(-50%);
   display: flex;
   justify-content: center;
   pointer-events: none;
-  z-index: 5;
-  grid-column: 1 / -1;
+  z-index: 200;
 }
 
 .selectionActionBar {
   pointer-events: auto;
   display: inline-flex;
   align-items: center;
-  gap: 8px;
-  padding: 6px 10px;
-  border-radius: var(--mantine-radius-md);
-  box-shadow: var(--mantine-shadow-lg);
-  background: light-dark(var(--mantine-color-white), var(--mantine-color-dark-6));
-  border: 1px solid light-dark(var(--mantine-color-gray-3), var(--mantine-color-dark-4));
+  gap: 4px;
+  padding: 6px 6px 6px 14px;
+  border-radius: 999px;
+  box-shadow:
+    0 10px 30px rgba(0, 0, 0, 0.25),
+    0 2px 8px rgba(0, 0, 0, 0.18);
+  background: light-dark(
+    var(--mantine-color-dark-8),
+    var(--mantine-color-dark-5)
+  );
+  color: var(--mantine-color-white);
+  border: 1px solid light-dark(
+    var(--mantine-color-dark-9),
+    var(--mantine-color-dark-4)
+  );
 }
 
 .selectionActionBarCount {
   font-size: var(--mantine-font-size-sm);
-  color: light-dark(var(--mantine-color-gray-7), var(--mantine-color-dark-0));
+  font-weight: 500;
+  color: var(--mantine-color-white);
+  padding-right: 10px;
+  margin-right: 2px;
+  border-right: 1px solid rgba(255, 255, 255, 0.15);
+}
+
+.selectionActionBarDelete {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 10px;
+  border: none;
+  background: transparent;
+  color: var(--mantine-color-red-4);
+  font-size: var(--mantine-font-size-sm);
+  font-weight: 500;
+  border-radius: 999px;
+  cursor: pointer;
+  transition: background 120ms ease;
+}
+
+.selectionActionBarDelete:hover:not(:disabled) {
+  background: rgba(255, 255, 255, 0.08);
+}
+
+.selectionActionBarDelete:disabled {
+  opacity: 0.6;
+  cursor: default;
+}
+
+.selectionActionBarClose {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 26px;
+  height: 26px;
+  border: none;
+  background: transparent;
+  color: var(--mantine-color-gray-3);
+  border-radius: 999px;
+  cursor: pointer;
+  transition: background 120ms ease, color 120ms ease;
+}
+
+.selectionActionBarClose:hover {
+  background: rgba(255, 255, 255, 0.08);
+  color: var(--mantine-color-white);
 }