🚸(frontend) add permissions dialog to guide users through setup

Introduce guided permissions dialog to help users understand and
resolve camera/microphone access issues step-by-step.

Addresses common user support requests where users cannot enable their
hardware and don't understand the permission requirements. Provides
clear instructions to reduce confusion and support burden.

Image was quickly prototyped. It will be updated later on.

src/frontend/package.json

@@ -22,6 +22,7 @@
     "@tanstack/react-query": "5.81.5",
     "@timephy/rnnoise-wasm": "1.0.0",
     "crisp-sdk-web": "1.0.25",
+    "derive-valtio": "0.2.0",
     "hoofd": "1.7.3",
     "humanize-duration": "3.33.0",
     "i18next": "25.3.1",