fix(web): resolve two eslint errors in Knowledge.svelte

- drop the unused KnowledgeItem type import
- the svelte/no-at-html-tags disable comment sat on the wrong line: the
  multi-line Card.Description opening tag meant "next line" wasn't the
  line with {@html}, so it never suppressed. Reformatted so the {@html}
  is on its own line, directly after the disable comment. Sanitization
  (DOMPurify with ALLOWED_TAGS: ['b']) is unchanged — this was a false
  positive, verified live (search results still render <b> highlights,
  no script/attribute injection).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/pages/Knowledge.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
   import DOMPurify from 'dompurify'
-  import { searchKnowledge, fetchRecentKnowledge, type KnowledgeHit, type RecentKnowledge, type KnowledgeItem } from '$lib/api'
+  import { searchKnowledge, fetchRecentKnowledge, type KnowledgeHit, type RecentKnowledge } from '$lib/api'
   import * as Card from '$lib/components/ui/card'
   import { Badge } from '$lib/components/ui/badge'
   import { Input } from '$lib/components/ui/input'
@@ -101,10 +101,10 @@
                 <StatusBadge kind="type" value={hit.type} />
               </div>
               {#if hit.snippet}
-                <!-- eslint-disable-next-line svelte/no-at-html-tags — sanitized below, ts_headline only ever emits <b> -->
-                <Card.Description class="text-xs"
-                  >{@html DOMPurify.sanitize(hit.snippet, { ALLOWED_TAGS: ['b'], ALLOWED_ATTR: [] })}</Card.Description
-                >
+                <Card.Description class="text-xs">
+                  <!-- eslint-disable-next-line svelte/no-at-html-tags — sanitized inline; ts_headline only ever emits <b> -->
+                  {@html DOMPurify.sanitize(hit.snippet, { ALLOWED_TAGS: ['b'], ALLOWED_ATTR: [] })}
+                </Card.Description>
               {/if}
               {#if hit.linked_entities?.length}
                 <div class="mt-1 flex flex-wrap gap-1">