feat(analytics): track and display visit-to-pledge conversion rate by…

[p70436464-prog]

Closes #1237

Summary

This PR resolves the feature request to track and display the campaign page visit-to-pledge conversion rate broken down by traffic source in the creator analytics dashboard.

Changes

• Traffic Source Conversion Rates: Added support for direct, social, email, and search referral sources, attributing pledges to referral sources and computing percentage visit-to-pledge conversion rates ((pledges / visitors) * 100).
• Dashboard UI Breakdown: Rendered conversion rates as percentages alongside visitor, view, and pledge metrics for direct, social, email, and search traffic sources.
• Pledge Funnel Chart: Added a 3-stage funnel chart showing Visitors -> Pledge initiated -> Pledge completed with counts, conversion percentages, and drop-off rates.
• API & Schemas: Updated Zod route schemas, GraphQL types, and PostgreSQL check constraints to support the new sources and funnel stages.

Acceptance Criteria Verification

• Conversion rate displayed as percentage
• Breakdown by referral source (direct, social, email, search)
• Funnel chart showing visitors to pledge initiated to pledge completed

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