feat: node info, build info and acrylic web theme

Squash of recent dev work: return_session login, backend switcher, line
detail timeline, overview strips, node platform/country/ISP info with flags
and icons, build info (version, tag, time) behind site.show_build, and the
acrylic display theme.

web/package.json

@@ -2,7 +2,10 @@
   "name": "monitor-web",
   "private": true,
   "version": "0.1.0",
-  "workspaces": ["display", "admin"],
+  "workspaces": [
+    "display",
+    "admin"
+  ],
   "scripts": {
     "dev": "node dev.mjs",
     "dev:display": "npm run dev -w display",
@@ -10,5 +13,9 @@
     "build": "npm run build -w display && npm run build -w admin",
     "gen:api": "npx -y openapi-typescript ../backend/openapi/v1.json -o shared/api/schema.ts",
     "lint:css": "npm run lint:css -w display && npm run lint:css -w admin"
+  },
+  "dependencies": {
+    "flag-icons": "^7.5.0",
+    "simple-icons": "^16.34.0"
   }
 }