handleInsert prompted the user (tui.PromptSelect) to choose which child
branch to move onto a newly inserted branch — importing internal/tui into
the action layer. create already has a Handler with prompt methods
(PromptStageChanges, PromptScope) implemented by the CLI handlers, so add a
PromptChildToMove(children) method the same way:

• create.Handler + NullHandler gain PromptChildToMove (null returns "all").
• The CLI SimpleCreateHandler returns "all"; InteractiveCreateHandler builds
  the select options and calls tui.PromptSelect.
• handleInsert takes the handler and calls h.PromptChildToMove, gated on
  h.IsInteractive() (replacing the inline utils.IsInteractive + tui usage).

create/insert.go no longer imports internal/tui or internal/utils (now
9 tui-importing action files). Behavior preserved (lint, create unit tests,
integration 494).

Stack

• PR refactor(actions): take rename's prompt off the TUI; drop tui from restack #1164
  • PR refactor: extract OpenEditor into internal/editor, out of the TUI package #1242
    • PR refactor(create): route insert's child-select prompt through the Handler #1241 👈

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