Add PostHog

[skyfallwastaken]

(For analytics!)

[Copilot]

Pull request overview

This PR integrates PostHog analytics into the application to track user behavior and application usage. The integration includes both client-side JavaScript tracking and server-side Ruby event capture.

Changes:

• Added PostHog Ruby gem and client-side JavaScript integration for analytics tracking
• Implemented PosthogService with methods for capturing events and identifying users
• Added analytics tracking for key user actions: signups, sign-ins, settings updates, API key rotation, onboarding flow, and heartbeat submissions

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
Gemfile	Added posthog-ruby gem dependency
Gemfile.lock	Locked posthog-ruby version 3.4.0 with concurrent-ruby dependency
.env.example	Added PostHog configuration environment variables (API key and host)
config/initializers/posthog.rb	Initializes PostHog client with configuration and error handling
app/services/posthog_service.rb	Service class providing capture, identify, and capture_once_per_day methods for analytics tracking
app/views/layouts/application.html.erb	Embedded PostHog JavaScript snippet for client-side tracking with user identification
app/models/user.rb	Added analytics tracking for new user signups
app/controllers/users_controller.rb	Added tracking for settings updates, API key rotation, and onboarding steps
app/controllers/sessions_controller.rb	Added tracking for sign-ins (HCA, Slack, email), GitHub linking, and sign-outs
app/controllers/api/hackatime/v1/hackatime_controller.rb	Added daily tracking for heartbeat submissions

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