feat: add dividers to the sidebar and wrap long titles

Update @tnsu/ui-kit to 0.14.0: thin lines between sidebar items make the
long menu easier to scan, and long titles such as "Загрузить работы из
сметы" wrap to a second line instead of being cut off.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

package.json

@@ -21,7 +21,7 @@
     "@microsoft/sp-office-ui-fabric-core": "1.22.1",
     "@microsoft/sp-property-pane": "1.22.1",
     "@microsoft/sp-webpart-base": "1.22.1",
-    "@tnsu/ui-kit": "^0.13.0",
+    "@tnsu/ui-kit": "^0.14.0",
     "react": "17.0.1",
     "react-dom": "17.0.1",
     "tslib": "2.3.1"