Rename Brain to Upload material and Instruction to Brain and AI

Upload material (/upload) drops the metric cards for a larger upload box
above the material list; Brain and AI moves to /brain. Old paths redirect.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/pages/Results.tsx

@@ -105,7 +105,7 @@ function NoResults({ filtered, icon }: { filtered: boolean; icon: IconName }) {
       <span className="empty-icon"><Icon name={icon} /></span>
       <h3>{t('res.empty')}</h3>
       <p>{t('res.emptyCopy')}</p>
-      <Link className="btn light" to="/instruction"><Icon name="plus" />{t('sch.newInstruction')}</Link>
+      <Link className="btn light" to="/brain"><Icon name="plus" />{t('sch.newInstruction')}</Link>
     </div>
   )
 }
@@ -427,7 +427,7 @@ function SourceRow({ source: s }: { source: FoundSource }) {
       <div>
         <span className={`status ${tone}`}><i className="dot"></i>{label}</span>
         <h3>{s.url ? <a href={s.url} target="_blank" rel="noreferrer">{s.title}</a> : s.title}</h3>
-        <p>{describeRule(s.rule)} · {fmt(s.createdAt)}{s.status === 'accepted' && <> · <Link to="/brain">{t('res.inBrain')}</Link></>}</p>
+        <p>{describeRule(s.rule)} · {fmt(s.createdAt)}{s.status === 'accepted' && <> · <Link to="/upload">{t('res.inBrain')}</Link></>}</p>
         {s.preview && <p className="source-preview">{s.preview}</p>}
         {review.error && <span className="error">{review.error.message}</span>}
       </div>