Remove PostHog analytics and update dependencies to latest minor versions

- Remove posthog-js and posthog-node dependencies
- Delete PostHogProvider component and lib/posthog.ts
- Remove PostHog configuration from environment files
- Remove PostHog rewrites from next.config.mjs
- Update all npm subdependencies to latest minor versions
- Update @types/react and @types/react-dom overrides to 19.2.9 and 19.2.3

docker-compose.yml

@@ -13,10 +13,6 @@ services:
       - NEXT_PUBLIC_NAVIDROME_USERNAME=${NAVIDROME_USERNAME:-}
       - NEXT_PUBLIC_NAVIDROME_PASSWORD=${NAVIDROME_PASSWORD:-}
       
-      # PostHog Analytics (optional)
-      # - NEXT_PUBLIC_POSTHOG_KEY=phc_Sa39J7754MwaHrPxYiWnWETVSD3g1cU4nOplMGczRE9
-      # - NEXT_PUBLIC_POSTHOG_HOST=https://us.i.posthog.com
-
       # Application Port
       - PORT=40625