Implement ListView CRUD events (16 missing) #356
Description
Problem
ListView is missing 16 CRUD-related events from the original Web Forms control. Deferred since M7. ListView is at about 60 percent event parity.
Missing events:
- ItemInserting / ItemInserted
- ItemUpdating / ItemUpdated
- ItemDeleting / ItemDeleted
- ItemEditing / ItemCanceling
- Sorting / Sorted
- PagePropertiesChanging / PagePropertiesChanged
- LayoutCreated
- SelectedIndexChanging / SelectedIndexChanged
- ItemCreated / DataBound (override)
Acceptance Criteria
- All 16 events implemented
- Events fire in correct order matching Web Forms lifecycle
- EventArgs types match Web Forms originals
- bUnit tests for each event
- HandleCommand routing works correctly
Size: Large
Source: Deferred since M7