feat: add trial detection to desktop app via JWT claims

[devin-ai-integration]

Summary

Adds trial detection capability to the desktop app by extending JWT claims with subscription status and trial end date. Previously, the desktop app could only detect if a user had hyprnote_pro entitlement but couldn't distinguish between trial and paid subscriptions or know when the trial would expire.

Changes:

• SQL migration updates custom_access_token_hook to include subscription_status ("trialing" | "active") and trial_end (Unix timestamp) from stripe.subscriptions
• billing.tsx extracts new claims and exposes isTrialing and trialDaysRemaining via BillingContext
• Account settings UI now shows trial-specific messaging (e.g., "Your trial ends in 5 days")

Review & Testing Checklist for Human

• Verify SQL migration on staging: The auth hook is critical infrastructure. Test that the trial_end extraction (s.trial_end #>> '{}')::bigint works correctly with actual Stripe subscription data (the field is stored as jsonb)
• Test with a trial user: Verify the UI shows correct trial days remaining and updates after session refresh
• Test edge cases: trial ending today (shows "ends today"), trial ended (shows 0 days), no subscription (shows FREE), active paid subscription (shows PRO without trial messaging)
• Verify backward compatibility: Existing users with old tokens (without new claims) should continue to work normally until their token refreshes

Recommended Test Plan

1. Apply migration to staging/dev Supabase instance
2. Create a test user and start a trial via the existing flow
3. Sign in on desktop app and verify account settings shows trial status
4. Manually refresh session and verify trial days update correctly

Notes

• Users will see updated trial info after their JWT refreshes (~1 hour default, or on app restart)
• The migration is additive - it replaces the auth hook function but maintains backward compatibility with existing entitlements logic

Link to Devin run: https://app.devin.ai/sessions/9b6fe60fb4b048ecb70be93263634607
Requested by: yujonglee (@yujonglee)

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