fix(web): distinguish singular/plural in pending action submit label

[jvzijp]

What Changed

The pending action submit button now displays "Submit answer" (singular) when there is only one question, and "Submit answers" (plural) when there are multiple questions. Previously it always showed "Submit answers" regardless of count.

• Added questionIndex to the formatPendingPrimaryActionLabel input
• When isLastQuestion is true and questionIndex === 0, the label is "Submit answer"; otherwise "Submit answers"
• Exported formatPendingPrimaryActionLabel and added unit tests covering all branches

Why

Showing "Submit answers" when the user is answering a single question is misleading — it implies there are multiple responses being submitted. This small copy fix makes the UI more accurate and less confusing.

UI Changes

Scenario	Before	After
Single question (questionIndex: 0)	"Submit answers"	"Submit answer"
Multiple questions (questionIndex > 0)	"Submit answers"	"Submit answers" (unchanged)

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes — N/A, no animation changes

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Note

Low Risk
Low risk UI copy/labeling change scoped to the chat composer submit button, with added unit coverage to prevent regressions.

Overview
Updates the chat composer’s pending-action primary button label to use singular Submit answer when submitting a single-question flow (questionIndex === 0), and plural Submit answers when multiple questions are involved.

Exports formatPendingPrimaryActionLabel, passes through questionIndex, and adds a Vitest suite covering responding/compact/non-compact label variants.

^{Reviewed by Cursor Bugbot for commit 896e77e. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Distinguish singular/plural in submit button label for pending actions

In non-compact mode, formatPendingPrimaryActionLabel now returns 'Submit answer' when questionIndex is 0 and 'Submit answers' when questionIndex > 0, so the label reflects how many answers have been given. Compact mode and responding state behavior are unchanged. Eight unit test cases are added to cover all label variants.

^{Macroscope summarized 896e77e.}

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[macroscopeapp]

Approvability

Verdict: Approved

Simple UI copy fix that distinguishes singular/plural grammar in a button label based on question count. The change is minimal, well-tested, and has no runtime behavior impact beyond display text.

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