feat: sidebar utility items match NavLink styling

Use variant='sidebar' for ThemeToggle, NotificationCenter, and
compact UserMenu so they render with the same icon+label layout
as nav items. Fixed dropdown positioning uses fixed to escape
sidebar overflow:hidden.

package-lock.json

@@ -8,7 +8,7 @@
       "name": "pulse-frontend",
       "version": "0.15.0-alpha",
       "dependencies": {
-        "@ciphera-net/ui": "^0.2.12",
+        "@ciphera-net/ui": "^0.2.13",
         "@ducanh2912/next-pwa": "^10.2.9",
         "@phosphor-icons/react": "^2.1.10",
         "@simplewebauthn/browser": "^13.2.2",
@@ -1670,9 +1670,9 @@
       }
     },
     "node_modules/@ciphera-net/ui": {
-      "version": "0.2.12",
-      "resolved": "https://npm.pkg.github.com/download/@ciphera-net/ui/0.2.12/d6780a19e3f0128431d6ddb3166798f01fba28dc",
-      "integrity": "sha512-LQCG2ErTXBGB7PDRoco9uK6cE+9IenER9Yrxkc0BfvSG46irUwmI19H1WPzLohMQdy2Wu99eu/PP+0X7fQw3wA==",
+      "version": "0.2.13",
+      "resolved": "https://npm.pkg.github.com/download/@ciphera-net/ui/0.2.13/710acb1221e5906b8fd622ff6c77b469781c449d",
+      "integrity": "sha512-pHo0DkkjAr7qlnPy1GBtHm3XFQlUC8b/FQM5PCu9JvW3pHg6znufyCP/8Wqbu6jOIt4C+c6CSKvMKzeYPKi42Q==",
       "dependencies": {
         "@phosphor-icons/react": "^2.1.10",
         "class-variance-authority": "^0.7.1",