refactor: switch icons from react-icons to Phosphor

Replace react-icons and @radix-ui/react-icons with @phosphor-icons/react
for a consistent icon style across all dashboard panels.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -10,7 +10,7 @@
       "dependencies": {
         "@ciphera-net/ui": "^0.0.93",
         "@ducanh2912/next-pwa": "^10.2.9",
-        "@radix-ui/react-icons": "^1.3.0",
+        "@phosphor-icons/react": "^2.1.10",
         "@simplewebauthn/browser": "^13.2.2",
         "@stripe/react-stripe-js": "^5.6.0",
         "@stripe/stripe-js": "^8.7.0",
@@ -26,7 +26,6 @@
         "next": "^16.1.1",
         "react": "^19.2.3",
         "react-dom": "^19.2.3",
-        "react-icons": "^5.5.0",
         "react-markdown": "^10.1.0",
         "react-simple-maps": "^3.0.0",
         "recharts": "^2.15.0",
@@ -3274,6 +3273,19 @@
         "node": ">=12.4.0"
       }
     },
+    "node_modules/@phosphor-icons/react": {
+      "version": "2.1.10",
+      "resolved": "https://registry.npmjs.org/@phosphor-icons/react/-/react-2.1.10.tgz",
+      "integrity": "sha512-vt8Tvq8GLjheAZZYa+YG/pW7HDbov8El/MANW8pOAz4eGxrwhnbfrQZq0Cp4q8zBEu8NIhHdnr+r8thnfRSNYA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "peerDependencies": {
+        "react": ">= 16.8",
+        "react-dom": ">= 16.8"
+      }
+    },
     "node_modules/@radix-ui/react-icons": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/@radix-ui/react-icons/-/react-icons-1.3.2.tgz",
@@ -11081,15 +11093,6 @@
         "react": "^19.2.4"
       }
     },
-    "node_modules/react-icons": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/react-icons/-/react-icons-5.5.0.tgz",
-      "integrity": "sha512-MEFcXdkP3dLo8uumGI5xN3lDFNsRtrjbOEKDLD7yv76v4wpnEq2Lt2qeHaQOr34I/wPN3s3+N08WkQ+CW37Xiw==",
-      "license": "MIT",
-      "peerDependencies": {
-        "react": "*"
-      }
-    },
     "node_modules/react-is": {
       "version": "16.13.1",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",