fix: create opportunity button silently no-ops

[arturasmckwcz]

Summary

• detailsMethods used createOpportunityDetailsSchema which requires a title field
• But title lives in the separate headerMethods form — so detailsMethods.trigger() always returned false
• handleCreate hit the early return guard every time and never called createOpportunity
• No visible feedback to the user (button not disabled, no error message) because title error lands on a key that no rendered field displays

Fix: export createNewOpportunityDetailsSchema (omits title via Zod .omit()) and use it in NewOpportunity. The existing createOpportunityDetailsSchema + OpportunityDetailsFormData are unchanged — OpportunityDetailsEdit (where title IS part of that section) continues to work correctly.

Test plan

• Open /dashboard/opportunities/new, fill in the form as an agent, click "Create opportunity" — request should fire and redirect on success
• Verify event-type, regular-type, and accompanying-type submissions all proceed past the button
• Verify editing an existing opportunity (OpportunityDetailsEdit) still validates title

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