refactor(webui): use shared organization explorer tree

webui/src/styles/organizations.css

@@ -50,51 +50,6 @@
   padding-top: 2px;
 }
 
-.organizations-tree-toolbar {
-  display: flex;
-  justify-content: flex-start;
-  margin-bottom: 12px;
-}
-
-.organizations-tree-list {
-  display: grid;
-  gap: 4px;
-  max-height: 640px;
-  overflow: auto;
-}
-
-.organizations-tree-row {
-  display: grid;
-  grid-template-columns: minmax(0, 1fr) auto;
-  align-items: center;
-  gap: 6px;
-}
-
-.organizations-tree-node {
-  display: grid;
-  gap: 2px;
-  width: 100%;
-  min-width: 0;
-  padding: 8px 10px;
-  border: 1px solid transparent;
-  border-radius: 7px;
-  background: transparent;
-  color: var(--text);
-  text-align: left;
-  cursor: pointer;
-}
-
-.organizations-tree-node:hover,
-.organizations-tree-node.active {
-  border-color: var(--line);
-  background: var(--surface-muted);
-}
-
-.organizations-tree-node span {
-  color: var(--muted);
-  font-size: 12px;
-}
-
 .organizations-field-note {
   margin: 8px 0 0;
   color: var(--muted);