Fix lint errors, upgrade react-simple-maps to v5 (clears high vuln), My Notes: search other studies + Markdown download; v2.42.2

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

src/App.css

@@ -14162,3 +14162,6 @@ a.sl-pager-link:hover { border-color: rgba(201, 168, 76, 0.6); transform: transl
 .notes-reader-meta { margin: 0.25rem 0 1rem; font-size: 0.82rem; color: #7a7060; }
 .notes-copy-btn { background: none; border: 0; padding: 0; color: #c9a84c; cursor: pointer; font: inherit; text-decoration: underline; }
 .notes-copy-btn:hover { color: #e3c46a; }
+
+.notes-other-matches { margin-top: 1rem; }
+.notes-export-btn { margin-top: 1rem; width: 100%; }