feat: replace Phosphor brand icons with real SVG logos

Uses @icons-pack/react-simple-icons for available brands (Google,
Facebook, Instagram, GitHub, YouTube, Reddit, etc.) and inline SVGs
for brands missing from the package (X, LinkedIn, OpenAI, Bing).
All icons now show actual brand logos with correct colors.

package-lock.json

@@ -10,6 +10,7 @@
       "dependencies": {
         "@ciphera-net/ui": "^0.3.1",
         "@ducanh2912/next-pwa": "^10.2.9",
+        "@icons-pack/react-simple-icons": "^13.13.0",
         "@phosphor-icons/react": "^2.1.10",
         "@radix-ui/react-icons": "^1.3.2",
         "@radix-ui/react-navigation-menu": "^1.2.14",
@@ -2587,6 +2588,19 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@icons-pack/react-simple-icons": {
+      "version": "13.13.0",
+      "resolved": "https://registry.npmjs.org/@icons-pack/react-simple-icons/-/react-simple-icons-13.13.0.tgz",
+      "integrity": "sha512-B5HhQMIpcSH4z8IZ8HFhD59CboHceKYMpPC9kAwGyKntvPdyJJv26DLu4Z1wAjcCLyrJhf11tMhiQGom9Rxb9g==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=24",
+        "pnpm": ">=10"
+      },
+      "peerDependencies": {
+        "react": "^16.13 || ^17 || ^18 || ^19"
+      }
+    },
     "node_modules/@img/colour": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.0.0.tgz",