Don't auto-submit multi-select agent questions on toggle

[coolcom200]

Description

For the AskUserQuestion tool, the last multi-select question would auto-submit the whole questionnaire as soon as a single option was toggled — whether by clicking it with the mouse or pressing its number key. This made it impossible to select more than one option (the reported case: a user clicked the first option intending to also click the next, but it submitted after the first click).

Multi-select questions now never auto-submit on toggle. Options are toggled explicitly via mouse click or number keys, and the user submits the question with Enter. Single-select behavior is unchanged (toggling an option still auto-advances / auto-submits the last question).

Changes

• ask_user_question_auto_advance_enabled now keys off is_multiselect only — single-select auto-advances, multi-select never does.
• toggle_option no longer schedules an auto-advance for multi-select questions.
• save_other_text follows the same rule for the "Other…" free-text path on multi-select questions.
• press_enter no longer toggles the highlighted option for multi-select; it just commits the current selection and submits/advances (single-select still activates the highlighted option on Enter). This also fixes Enter accidentally un-toggling the last-clicked/hovered option in multi-select.

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

Updated and extended the ask_user_question_view unit tests to cover the new behavior, and ran them:

cargo nextest run -p warp -E 'test(ask_user_question_view)'
19 tests run: 19 passed

• New/updated tests: last_multi_select_toggle_does_not_auto_advance, last_multi_select_submits_on_enter, enter_on_multi_select_does_not_toggle_highlighted_option, enter_on_answered_multi_select_keeps_selection_without_toggling_highlighted_option.

• I have manually tested my changes locally with ./script/run

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Conversation: https://staging.warp.dev/conversation/5044c0f2-de4e-4143-989e-7e55b7a6c62e
Run: https://oz.staging.warp.dev/runs/019eb8d5-5f41-77df-b381-ce5db367205a

This PR was generated with Oz.