fix: create deep copy of file passed into tree

Ben Schlegel

2023-09-16 fea352849c6972da4b3b8935eb2e86f6cefc76ed

 quartz/components/RecentNotes.tsx

@@ -48,7 +48,7 @@
                  </div>
                  {page.dates && (
                    <p class="meta">
                      <Date date={getDate(cfg, fileData)!} />
                      <Date date={getDate(cfg, page)!} />
                    </p>
                  )}
                  <ul class="tags">