feat: improve session tracking (SSO method, page views, interactions)

[coderabbitai]

The SessionTracker component has several incomplete tracking items.

File: src/components/SessionTracker.tsx

Line	Issue
51	Determine the SSO method from Clerk (currently hardcoded as 'clerk')
127	Track page views separately instead of hardcoding pageViews: 1
128	Track interactions separately instead of hardcoding interactions: 0

Action required:

• Investigate the Clerk SDK for a way to retrieve the sign-in method.
• Implement per-session page view counting.
• Implement per-session interaction counting.

---

Requested by @Producdevity — related to PR #375