Remove accordion display mode from ToC component

src/lib/components/publications/TableOfContents.svelte

@@ -4,17 +4,13 @@
     type TocEntry 
   } from '$lib/components/publications/table_of_contents.svelte';
   import { getContext } from 'svelte';
-  import { Accordion, AccordionItem, SidebarDropdownWrapper, SidebarGroup, SidebarItem } from 'flowbite-svelte';
+  import { SidebarDropdownWrapper, SidebarGroup, SidebarItem } from 'flowbite-svelte';
   import Self from './TableOfContents.svelte';
 
-  export type TocDisplayMode = 'accordion' | 'sidebar';
-
   let {
-    displayMode = 'accordion',
     depth,
     onSectionFocused,
   } = $props<{
-    displayMode?: TocDisplayMode;
     rootAddress: string;
     depth: number;
     onSectionFocused?: (address: string) => void;
@@ -46,33 +42,6 @@
   }
 </script>
 
-<!-- Michael J - 16 June 2025 - Accordion mode is untested. -->
-{#if displayMode === 'accordion'}
-  <Accordion multiple>
-    {#each entries as entry}
-      {@const address = entry.address}
-      {@const expanded = toc.expandedMap.get(address) ?? false}
-      <AccordionItem 
-        bind:open={
-          () => expanded,
-          (open) => setEntryExpanded(address, open)
-        }
-      >
-        {#snippet header()}
-          <span class="text-gray-800 dark:text-gray-300">{entry.title}</span>
-        {/snippet}
-        {#if entry.children.length > 0}
-          <Self
-            displayMode={displayMode}
-            rootAddress={entry.address}
-            depth={depth + 1}
-            onSectionFocused={onSectionFocused}
-          />
-        {/if}
-      </AccordionItem>
-    {/each}
-  </Accordion>
-{:else}
 <!-- TODO: Figure out how to style indentations. -->
 <!-- TODO: Make group title fonts the same as entry title fonts. -->
 <SidebarGroup>
@@ -98,7 +67,6 @@
         }
       >
         <Self
-            displayMode={displayMode}
           rootAddress={address}
           depth={childDepth}
           onSectionFocused={onSectionFocused}
@@ -107,4 +75,3 @@
     {/if}
   {/each}
 </SidebarGroup>
-{/if}