feat(kb): AI Draft button in KB article editor

- Imports Sparkles icon from lucide-solid
- Adds [drafting, setDrafting] signal
- Adds aiDraft() function: calls POST /api/admin/kb/articles/ai-draft
  with current title + resolved category name; fills content field and
  summary field (only if summary is currently empty) from the response
- AI Draft button appears inline with the Content label, styled in the
  orange/amber palette; shows 'Generating...' while in flight
- Adds monospace font to the content textarea and a helper hint line
  reminding admins to review before saving

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/admin/kb/index.tsx

@@ -1,6 +1,6 @@
 import { A } from '@solidjs/router';
 import { createMemo, createResource, createSignal, For, Show } from 'solid-js';
-import { BookOpen, Plus } from 'lucide-solid';
+import { BookOpen, Plus, Sparkles } from 'lucide-solid';
 
 const API = '';
 
@@ -233,6 +233,7 @@ export default function KnowledgeBasePage(props: KnowledgeBasePageProps) {
   const [categoryId, setCategoryId] = createSignal('');
   const [status, setStatus] = createSignal<'PUBLISHED' | 'DRAFT'>('DRAFT');
   const [saving, setSaving] = createSignal(false);
+  const [drafting, setDrafting] = createSignal(false);
   const [formError, setFormError] = createSignal('');
 
   const [catFormId, setCatFormId] = createSignal('');
@@ -306,6 +307,38 @@ export default function KnowledgeBasePage(props: KnowledgeBasePageProps) {
     setTab('editor');
   };
 
+  const aiDraft = async () => {
+    if (!title().trim()) {
+      setFormError('Enter a title before generating a draft.');
+      return;
+    }
+    setFormError('');
+    setDrafting(true);
+    try {
+      const catName = (categories() || []).find((c) => c.id === categoryId())?.name;
+      const res = await fetch(`${API}/api/admin/kb/articles/ai-draft`, {
+        method: 'POST',
+        headers: authHeaders(true),
+        body: JSON.stringify({
+          title: title(),
+          category: catName,
+          topic_hints: undefined,
+        }),
+      });
+      const data = await res.json().catch(() => ({}));
+      if (!res.ok) {
+        setFormError(data.error || 'AI generation failed');
+        return;
+      }
+      if (data.content) setContent(data.content);
+      if (data.summary && !summary().trim()) setSummary(data.summary);
+    } catch {
+      setFormError('AI generation failed — check your connection.');
+    } finally {
+      setDrafting(false);
+    }
+  };
+
   const handleSaveArticle = async () => {
     if (!title().trim()) {
       setFormError('Title is required');
@@ -675,8 +708,20 @@ export default function KnowledgeBasePage(props: KnowledgeBasePageProps) {
               <input value={summary()} onInput={(e) => setSummary(e.currentTarget.value)} style="width:100%;padding:10px 12px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px" />
             </div>
             <div style="grid-column:1 / -1">
-              <label style="display:block;font-size:13px;font-weight:600;margin-bottom:4px">Content</label>
-              <textarea rows={14} value={content()} onInput={(e) => setContent(e.currentTarget.value)} style="width:100%;padding:10px 12px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;resize:vertical" />
+              <div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:4px">
+                <label style="display:block;font-size:13px;font-weight:600">Content</label>
+                <button
+                  type="button"
+                  onClick={aiDraft}
+                  disabled={drafting()}
+                  style={`display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 10px;border-radius:6px;border:1px solid #FDBA74;background:${drafting() ? '#F3F4F6' : '#FFF5F0'};font-size:11px;font-weight:700;color:${drafting() ? '#9CA3AF' : '#92400E'};cursor:${drafting() ? 'default' : 'pointer'}`}
+                >
+                  <Sparkles size={12} />
+                  {drafting() ? 'Generating…' : 'AI Draft'}
+                </button>
+              </div>
+              <textarea rows={14} value={content()} onInput={(e) => setContent(e.currentTarget.value)} style="width:100%;padding:10px 12px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;resize:vertical;font-family:monospace" />
+              <p style="margin:4px 0 0;font-size:11px;color:#9CA3AF">Markdown supported. AI Draft fills this from the title + category — review before saving.</p>
             </div>
             <div style="display:flex;align-items:center;gap:8px">
               <input type="checkbox" checked={status() === 'PUBLISHED'} onChange={(e) => setStatus(e.currentTarget.checked ? 'PUBLISHED' : 'DRAFT')} />