Follow up IME option creation and delete dialog timing fixes

[don9x2E]

Summary

Follow-up fixes after #3183 to address remaining real-world Korean IME issues and related UX regressions.

• Prevent unintended option creation while IME composition is active
• Local "Add a new answer option" row now creates only on explicit intent:
  • Enter after composition end, or
  • explicit + button click
• Keep live update behavior for already-created options
• After creating an option with Enter, move focus to the next empty local option row
• Fix delayed "Delete form" confirmation dialog by rendering dialog outside the actions slot

Why this follow-up is needed

The initial IME patch improved composition handling, but in actual Korean IME use there were still edge cases where input-driven side effects could trigger option creation timing unexpectedly.

Switching local-row creation to explicit intent removes those composition timing race paths while preserving normal editing for existing options.

Trade-off

Auto-create-on-input for the local empty row is intentionally disabled for now to prioritize deterministic IME-safe behavior.

Validation

• IME composition does not auto-create options
• Exactly one option is created on explicit Enter/click
• Focus advances to the next empty local row after creation
• Delete-form confirmation opens immediately on click

[Chartman123]

Looks good, just some small comments :)

[don9x2E]

Thanks for the review!

• I’ll move the AppNavigationForm.vue formatting change into a separate PR that references Delete form only possible by super weird, click order #3099.

• I’ll update the add option button to be disabled only during active IME composition (so it works for direct inputs).

• I’ll add the missing JSDoc blocks for the new handlers.

• I’ll push the follow-up updates shortly.

[Chartman123]

@don9x2E now the button is always enabled, even if there's no input at all. 😉

@susnux Can't we get rid of the debounce logic for onInput if we only submit the new options upon pressing enter or clicking the button?

[don9x2E]

Addressed: the add button is now disabled when input is empty (kept enabled for non-empty input, only disabled during active IME composition).

Re debounce: we still need it for updating existing options (typing in non-local options triggers PATCH).

For new option creation, it only happens via Enter or the add button.

[Chartman123]

@don9x2E the button is still not working as expected: now it stays disabled even if there is some input. It looks like your canCreateLocalAnswer is not executed upon input.

[Chartman123]

@don9x2E still the same... there were some issues with reactivity left. I tried to fix it with Copilot. Please have a look at my commit, if it's still working correctly during IME input. non-IME input is working now.

Before we merge it, please rebase your code on current main and also squash all commits into a single one.

[susnux]

Can't we get rid of the debounce logic for onInput if we only submit the new options upon pressing enter or clicking the button?

I guess so

[don9x2E]

Rebased on current main and squashed into a single commit (e6dd00a) with DCO sign-off. Also removed the AppNavigationForm changes (handled separately in #3188).

[Chartman123]

@don9x2E you've lost my changes

[don9x2E]

Sorry for the missing. Re-applied the reviewer changes and force-pushed the squashed commit (c39eb6f).

[Chartman123]

ok, now just the lint error and then we're good to go :)

[Chartman123]

/backport to stable5.2

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