🪄 refactor: UI Polish and Admin Dialog Unification (#11108)

* refactor(OpenSidebar): removed useless classNames

* style(Header): update hover styles across various components for improved UI consistency

* style(Nav): update hover styles in AccountSettings and SearchBar for improved UI consistency

* style: update button classes for consistent hover effects and improved UI responsiveness

* style(Nav, OpenSidebar, Header, Convo): improve UI responsiveness and animation transitions

* style(PresetsMenu, NewChat): update icon sizes and improve component styling for better UI consistency

* style(Nav, Root): enhance sidebar mobile animations and responsiveness for better UI experience

* style(ExportAndShareMenu, BookmarkMenu): update icon sizes for improved UI consistency

* style: remove transition duration from button classes for improved UI responsiveness

* style(CustomMenu, ModelSelector): update background colors for improved UI consistency and responsiveness

* style(ExportAndShareMenu): update icon color for improved UI consistency

* style(TemporaryChat): refine button styles for improved UI consistency and responsiveness

* style(BookmarkNav): refactor to use DropdownPopup and remove BookmarkNavItems for improved UI consistency and functionality

* style(CustomMenu, EndpointItem): enhance UI elements for improved consistency and accessibility

* style(EndpointItem): adjust gap in icon container for improved layout consistency

* style(CustomMenu, EndpointItem): update focus ring color for improved UI consistency

* style(EndpointItem): update icon color for improved UI consistency in dark theme

* style: update focus styles for improved accessibility and consistency across components

* refactor(Nav): extract sidebar width to NAV_WIDTH constant

Centralize mobile (320px) and desktop (260px) sidebar widths in a single
exported constant to avoid magic numbers and ensure consistency.

* fix(BookmarkNav): memoize handlers used in useMemo

Wrap handleTagClick and handleClear in useCallback and add them to the
dropdownItems useMemo dependency array to prevent stale closures.

* feat: introduce FilterInput component and replace existing inputs with it across multiple components

* feat(DataTable): replace custom input with FilterInput component for improved filtering

* fix: Nested dialog overlay stacking issue

Fixes overlay appearing behind content when opening nested dialogs.
Introduced dynamic z-index calculation based on dialog depth using React context.

- First dialog: overlay z-50, content z-100
- Nested dialogs increment by 60: overlay z-110/content z-160, etc.

Preserves a11y escape key handling from #10975 and #10851.

Regression from #11008 (afb67fcf1) which increased content z-index
without adjusting overlay z-index for nested dialog scenarios.

* Refactor admin settings components to use a unified AdminSettingsDialog

- Removed redundant code from AdminSettings, MCPAdminSettings, and Memories AdminSettings components.
- Introduced AdminSettingsDialog component to handle permission management for different sections.
- Updated permission handling logic to use a consistent structure across components.
- Enhanced role selection and permission confirmation features in the new dialog.
- Improved UI consistency and maintainability by centralizing dialog functionality.

* refactor(Memory): memory management UI components and replace MemoryViewer with MemoryPanel

* refactor(Memory): enhance UI components for Memory dialogs and improve input styling

* refactor(Bookmarks): improve bookmark management UI with enhanced styling

* refactor(translations): remove redundant filter input and bookmark count entries

* refactor(Convo): integrate useShiftKey hook for enhanced keyboard interaction and improve UI responsiveness

client/src/components/Sharing/GenericGrantAccessDialog.tsx

@@ -238,13 +238,16 @@ export default function GenericGrantAccessDialog({
       })}
       type="button"
       disabled={disabled}
+      className="h-full"
     >
       <div className="flex min-w-[32px] items-center justify-center gap-2 text-blue-500">
         <span className="flex h-6 w-6 items-center justify-center">
           <Share2Icon className="icon-md h-4 w-4" aria-hidden="true" />
         </span>
         {totalCurrentShares > 0 && (
-          <Label className="text-sm font-medium text-text-secondary">{totalCurrentShares}</Label>
+          <Label className="cursor-pointer text-sm font-medium text-text-secondary">
+            {totalCurrentShares}
+          </Label>
         )}
       </div>
     </Button>