fix: replace Select/datalist with styled Combobox for workflow event selectors

[hanamizuki]

Summary

Replace the conditional Select/Input pattern with a unified Combobox (Input + Command dropdown) for event name fields in both the workflow creation dialog and edit page. Users can always type custom event names while getting autocomplete suggestions from previously tracked events.

Problem

When tracked events exist, the event name fields render as a <Select> dropdown, preventing users from entering event names that haven't been tracked yet. This is problematic for system events like email.opened, email.clicked, etc. that only appear after first occurrence.

Solution

Use the existing cmdk Command components to build a styled Combobox that:

• Always allows free-text input
• Shows a filtered dropdown of previously tracked events as suggestions
• Matches the app's ShadCN/Radix UI design system (unlike native <datalist>)

Changes

apps/web/src/pages/workflows/index.tsx — CreateWorkflowDialog:

• Trigger event selector

apps/web/src/pages/workflows/[id].tsx — Workflow edit page:

• Workflow settings trigger event selector
• Add WAIT_FOR_EVENT step event selector
• Edit WAIT_FOR_EVENT step event selector

Test plan

• Create a new workflow, verify trigger event field allows both typing and selecting
• Add a WAIT_FOR_EVENT step, verify event name field allows both typing and selecting
• Edit an existing WAIT_FOR_EVENT step, verify same behavior
• With no tracked events, verify the input still works with free-text
• Verify autocomplete suggestions filter as you type
• Verify selecting a suggestion fills the input and closes the dropdown

🤖 Generated with Claude Code

[driaug]

This change would also need to happen on the workflow creation page.

[hanamizuki]

This change would also need to happen on the workflow creation page.

Done! I've updated the PR to include the workflow creation page as well.

I also replaced the native with a styled Combobox (using the existing cmdk Command components) so the dropdown matches the app's design system. Both the creation dialog and the edit page (trigger event, add/edit WAIT_FOR_EVENT) now use the same component.