Dedupe AgentTypeCombobox into AgentTypeSelect

[selfcontained]

What

Deletes AgentTypeCombobox from automations-form-fields.tsx — it duplicated ~90 lines of AgentTypeSelect (agent-type-select.tsx): identical trigger button, ArrowDown/Enter/Space/Escape key handling, and Command dropdown with requestAnimationFrame focus restoration. AgentTypeSelect gains an optional label prop (default "Type", so the create-agent dialog is unchanged), and both automations call sites (template config fields, launch dialog) now use it with label="Agent type". Net -101 lines.

Why it's tech debt

Two byte-near-identical dropdown implementations that must be kept in sync by hand. Top item on the tech-debt backlog from the 2026-07-21 audit. AgentTypeSelect already had the onOpenChange hook point the combobox lacked, so the duplicate had no remaining reason to exist.

Behavior notes

• Only visual delta: in the automations launch dialog the label-to-control gap goes from space-y-2 to the component's space-y-1, matching the other two forms.
• AgentTypeSelect renders the label inside its own wrapper; both former external label wrappers were removed.

Validation

• pnpm run check, pnpm run finalize:web green; E2E 175 passed.
• Playwright live validation of all three consumers (create-agent dialog, template config form, launch dialog): label text, dropdown open/select, Escape close all verified; screenshots shared via dispatch_share.

Queued next

Top of backlog: extract shared useStartupAttachments() hook for the ~55-line duplicated startup-attachment callbacks in use-create-agent-form.ts vs automations-launch-dialog.tsx.

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