Retain all form params in duplicate check interstitial pages

[Copilot]

What is the goal of this PR and why is this important?

Person and user creation forms lose all data when duplicate detection triggers. Users filling complex forms with nested attributes (sectors, organizations, addresses, profile settings) must re-enter everything after clicking "Go Back" or "Create Anyway" from the duplicate check page.

How did you approach the change?

Session storage on redirect:

• Store complete form params in session before redirecting to check_duplicates
• Clear session on successful save to prevent stale data

View updates:

• Retrieve stored params in check_duplicates actions
• Render all params as hidden fields in "Create Anyway" form using recursive helper
• Pass params to "Go Back" link for form repopulation
• Fallback to URL params when session empty (backwards compatibility)

Helper method:

# app/helpers/application_helper.rb
def hidden_fields_for_params(params_hash, prefix = nil)
  # Recursively renders nested hashes/arrays as hidden input tags
end

Controllers:

# Before redirect
session[:person_create_params] = params[:person].to_unsafe_h

# After save
session.delete(:person_create_params)

Anything else to add?

56 existing tests pass. Added 6 new tests validating param retention through duplicate check flow.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• vite
  • Triggering command: /usr/local/bin/bundle bundle exec rspec spec/requests/people_check_duplicates_spec.rb spec/requests/users_check_duplicates_spec.rb --format documentation _64-linux-gnu/12/cc1 2f4e1c8a2d7be9957dd5af35cfdef9e145f/log.json -plugin-opt=-pas-w by/backward _64-linux-gnu/12security -c (dns block)
  • Triggering command: /usr/local/bin/bundle bundle exec rspec spec/requests/users_check_duplicates_spec.rb:56 --format documentation nat 2f4e1c8a2d7be9957dd5af35cfdef9e145f/log.json OUTPUT -d 127.0.0.11 /node_modules/@esbuild/linux-x64--mode --wa�� e test nat /usr/local/bin/node 2f4e1c8a2d7be9957dd5af35cfdef9e145f/cec878078105d0d890c9b7f808610415167ad162df4820aec43d5f1e54d1bfca.pid -d 127.0.0.11 45f/log.json (dns block)
  • Triggering command: /usr/local/bin/bundle bundle exec rspec spec/requests/users_check_duplicates_spec.rb:56 --format documentation --backtrace in/node fb2ce4bdb0b7cb16bash -I /cc1 b82b582b5e42e3cba1ea1b89ab4fa8058e69.pid in/v�� (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.