fix: make back-link text consistent with aria-labels across file views

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
Agent-Logs-Url: https://github.com/christianlouis/DocuElevate/sessions/12276514-bd3d-4e3e-84d9-5977d1f82b19

frontend/templates/file_annotations.html

@@ -558,7 +558,7 @@
   <!-- ── Back + header ── -->
   <div style="display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem;flex-wrap:wrap;">
     <a href="/files/{{ file.id }}" style="display:inline-flex;align-items:center;gap:0.4rem;color:#3b82f6;font-weight:600;text-decoration:none;" aria-label="Back to File Summary">
-      <i class="fas fa-arrow-left" aria-hidden="true"></i> Back to File
+      <i class="fas fa-arrow-left" aria-hidden="true"></i> Back to File Summary
     </a>
   </div>