Registration form in organization invite flow should pre-fill email address

Problem Statement

When a user receives an organization invitation and clicks "Accept your invite"
in the email, they are directed to the "Accept organization invite" page.
Instead of immediately showing a registration form with the invitation email
pre-filled, the page displays multiple confusing options.

Impact:

• Higher abandonment rates during user onboarding
• User confusion about which action to take next
• Unnecessary complexity for a core workflow

Screenshots:

Solution Brainstorm

Current Behavior

1. User receives email: "Join [Organization] in using Sentry"
2. User clicks "Accept your invite"
3. → Redirected to "Accept organization invite" page
4. → Page shows multiple confusing options (rather than a clear registration form)

Expected Behavior

1. User clicks "Accept your invite" in the email
2. → Directly shown a registration form with:
   • Email field pre-filled (read-only or disabled) with the invitation email
   • Password field
   • Optional: Name field
3. → After registration: User automatically logged in and added to the organization

Additional Context

• This workflow affects every user invited via member.invite
• This is a fundamental onboarding path, not an edge case
• The current experience contradicts the intent of the invitation (join this org)

Device/Environment

• Platform: [Chrome/Edge/Firefox/Safari on Windows/MacOS]
• Sentry version: [latest/self-hosted-sentry]
• Steps to reproduce: Invite a new user to your organization via "Add Team Member" → Send invite → Click link as new user

Product Area

Profiling

Start with the member.invite flow and the Accept organization invite page, then reproduce the email-link path using the listed browser steps. Done means a newly invited user sees a registration form with the invitation email pre-filled, can complete registration, and is automatically logged in and added to the organization.