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.example.yml

@@ -12,10 +12,6 @@ services:
       # - NAVIDROME_USERNAME=user
       # - NAVIDROME_PASSWORD=password
 
-      # # PostHog Analytics
-      # - POSTHOG_KEY=phc_Sa39J7754MwaHrPxYiWnWETVSD3g1cU4nOplMGczRE9
-      # - POSTHOG_HOST=https://us.i.posthog.com
-
       # Application Port
       - PORT=40625