Open Brain documents from their title

Clicking a document's title fetches the original file from the engine:
viewable formats open in a new tab, the rest (or a blocked tab) download
under the original name.

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

src/i18n.ts

@@ -83,6 +83,7 @@ const en = {
   'brain.confirmCreditsFallback': 'credits',
   'brain.addToBrain': 'Add to Brain',
   'brain.delete': 'Delete {name}',
+  'brain.open': 'Open {name}',
   'brain.deleteConfirm': 'Delete “{name}” from the Brain?',
 
   // Instruction
@@ -460,6 +461,7 @@ const id: Record<Key, string> = {
   'brain.confirmCreditsFallback': 'kredit',
   'brain.addToBrain': 'Masukkan ke Otak',
   'brain.delete': 'Hapus {name}',
+  'brain.open': 'Buka {name}',
   'brain.deleteConfirm': 'Hapus “{name}” dari Otak?',
 
   'ins.title': 'Perintah',