fix: use $pageview event for PostHog web analytics

[Hugo0]

Summary

• Renames page_view_enhanced → $pageview so PostHog's built-in web analytics (DAU, WAU, bounce rate) works
• Keeps capture_pageview: false — we send $pageview manually to attach custom properties (language, platform, referrer, is_pwa)
• No change in event volume

Test plan

• Verify PostHog Web Analytics dashboard shows DAU/WAU after deploy
• Verify GA4 still receives pageview events

Summary by CodeRabbit

• Chores
  • Updated internal event tracking identifiers and cleaned up analytics configuration code.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9d68a2f4-038f-4e6b-a639-bb8c7bb36a93

📥 Commits

Reviewing files that changed from the base of the PR and between 82dc9b8 and 5c8473f.

📒 Files selected for processing (2)

• frontend/src/analytics.ts
• frontend/src/posthog.ts

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📝 Walkthrough

Walkthrough

Updates GA4 core event identifier from page_view_enhanced to $pageview across analytics tracking and documentation. Also removes an inline comment from PostHog configuration without altering functionality.

Changes

Cohort / File(s)	Summary
GA4 Event Identifier Updates frontend/src/analytics.ts	Replaced GA4 core event name from page_view_enhanced to $pageview in the GA4_EVENTS set, updated Safe dual-send wrapper documentation, and modified session-context page-view emission via trackPageView.
PostHog Configuration frontend/src/posthog.ts	Removed inline comment on the capture_pageview setting; no behavioral changes to initialization logic.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• Feat/analytics tracking #114: Introduces trackPageView functionality in analytics module that directly interacts with the GA4 event naming updated in this PR.
• refactor: slim GA4 to core events, PostHog is primary #159: Establishes GA4_EVENTS core-event gate including page_view_enhanced, which is replaced with $pageview in this PR.
• feat: Add GA4 analytics tracking #113: Implements GA4 tracking infrastructure that depends on correct event naming conventions being updated here.

Poem

🐰 A hop through the logs, so bright and so keen,
From enhanced views to the core-events scene,
$pageview now shines with clarity pure,
Analytics dance—our tracking's secure! ✨

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/enable-posthog-pageview

📝 Coding Plan

• Generate coding plan for human review comments

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