Handles all form events for MishkaGervaz.

This module centralizes event handling for:

• Validation (phx-change)
• Submission (phx-submit)
• Wizard step navigation
• Upload events
• Relation field search/select
• Cancel
• Reset — starts the form over as an empty create form, see MishkaGervaz.Form.Web.Live.reset/2
• Nested/array field management

Sub-builders

Events functionality is split into specialized sub-builders:

• SanitizationHandler - Input sanitization
• ValidationHandler - Form validation
• SubmitHandler - Form submission
• StepHandler - Wizard step navigation
• UploadHandler - File upload events
• RelationHandler - Relation field search/select
• HookRunner - Hook execution

Customization

You can override individual sub-builders via DSL:

mishka_gervaz do
  form do
    events do
      sanitization MyApp.CustomSanitizationHandler
      validation MyApp.CustomValidationHandler
      submit MyApp.CustomSubmitHandler
      step MyApp.CustomStepHandler
      upload MyApp.CustomUploadHandler
      hooks MyApp.CustomHookRunner
    end
  end
end

Or override the entire Events module:

mishka_gervaz do
  form do
    events MyApp.CustomFormEvents
  end
end

See MishkaGervaz.Form.Web.Events.Helpers (shared helpers exposed to sub-handlers and user overrides), MishkaGervaz.Form.Web.State, MishkaGervaz.Form.Web.DataLoader, MishkaGervaz.Form.Web.Live, and the sub-handlers SanitizationHandler, ValidationHandler, SubmitHandler, StepHandler, UploadHandler, RelationHandler, HookRunner.