refactor: admin section UX/UI redesign

- Fix critical --bg-base token bug (dark mode broken), replace with --bg-surface
- Replace hand-rolled admin nav with Tabs composite (proper ARIA)
- Migrate AuditLog from custom table to DataTable with sorting, row accents, card wrapper
- Remove duplicate h2 page titles (breadcrumb + tab already identify the page)
- Rework user creation with provider-aware form (Local/OIDC RadioGroup)
- Add Security section with password reset for local users, OIDC info for external
- Add toast notifications to all RBAC mutations (create/delete/add/remove)
- Add confirmation dialogs for cascading removals (group/role)
- Add keyboard accessibility to entity lists (role/tabIndex/aria-selected)
- Add empty search states, duplicate name validation
- Replace lock emoji with Badge, fix radii/shadow/padding consistency
- Badge dashed variant keeps background color
- Inherited roles shown with dashed outline + reduced opacity
- Inline MultiSelect (+Add) for groups, roles, members, child groups
- Center OIDC form, replace inline styles with CSS modules

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

src/pages/Admin/AuditLog/AuditLog.module.css

@@ -1,18 +1,3 @@
-.header {
-  display: flex;
-  align-items: center;
-  gap: 12px;
-  margin-bottom: 16px;
-}
-
-.title {
-  font-size: 18px;
-  font-weight: 600;
-  color: var(--text-primary);
-  margin: 0;
-  font-family: var(--font-body);
-}
-
 .filters {
   display: flex;
   gap: 10px;
@@ -28,52 +13,37 @@
   width: 160px;
 }
 
-.tableWrap {
-  overflow-x: auto;
+.tableSection {
+  background: var(--bg-surface);
   border: 1px solid var(--border-subtle);
-  border-radius: var(--radius-md);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  overflow: hidden;
 }
 
-.table {
-  width: 100%;
-  border-collapse: collapse;
-  font-family: var(--font-body);
-  font-size: 12px;
+.tableHeader {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 12px 16px;
+  border-bottom: 1px solid var(--border-subtle);
 }
 
-.th {
-  text-align: left;
-  padding: 10px 12px;
+.tableTitle {
+  font-size: 13px;
   font-weight: 600;
-  font-size: 11px;
-  text-transform: uppercase;
-  letter-spacing: 0.04em;
-  color: var(--text-muted);
-  background: var(--bg-raised);
-  border-bottom: 1px solid var(--border-subtle);
-  position: sticky;
-  top: 0;
-  z-index: 1;
-}
-
-.row {
-  cursor: pointer;
-  transition: background 0.1s;
-}
-
-.row:hover {
-  background: var(--bg-hover);
-}
-
-.td {
-  padding: 8px 12px;
-  border-bottom: 1px solid var(--border-subtle);
   color: var(--text-primary);
-  vertical-align: middle;
 }
 
-.userCell {
-  font-weight: 500;
+.tableRight {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.tableMeta {
+  font-size: 11px;
+  color: var(--text-muted);
 }
 
 .target {
@@ -84,19 +54,8 @@
   white-space: nowrap;
 }
 
-.empty {
-  padding: 32px;
-  text-align: center;
-  color: var(--text-faint);
-}
-
-.detailRow {
-  background: var(--bg-raised);
-}
-
-.detailCell {
-  padding: 16px 20px;
-  border-bottom: 1px solid var(--border-subtle);
+.expandedDetail {
+  padding: 4px 0;
 }
 
 .detailGrid {
@@ -113,10 +72,10 @@
 }
 
 .detailLabel {
-  font-size: 11px;
+  font-size: 10px;
   font-weight: 600;
   text-transform: uppercase;
-  letter-spacing: 0.04em;
+  letter-spacing: 0.8px;
   color: var(--text-muted);
   font-family: var(--font-body);
 }
@@ -125,15 +84,3 @@
   font-size: 12px;
   color: var(--text-secondary);
 }
-
-.detailJson {
-  display: flex;
-  flex-direction: column;
-  gap: 6px;
-}
-
-.pagination {
-  display: flex;
-  justify-content: center;
-  margin-top: 16px;
-}