New search function et drag and drop clean

templates/file-tree.html

@@ -1,3 +1,14 @@
+<!-- Zone de drop racine -->
+<div class="root-drop-zone folder-item" data-path="" data-is-dir="true" data-is-root="true">
+    <div class="folder-header root-folder-header">
+        <span class="folder-icon">🏠</span>
+        <span class="folder-name">Racine</span>
+        <span class="root-hint">(notes/)</span>
+    </div>
+</div>
+
+<hr style="border: none; border-top: 1px solid var(--border-primary); margin: 0.75rem 0;">
+
 {{if .Tree}}
 {{if .Tree.Children}}
     {{template "tree-node" .Tree}}