fix(mobile): show structured input option descriptions

[none23]

What Changed

Mobile structured-input options now show their descriptions below their labels, matching the web and desktop clients.

Options are stacked vertically and use the available width so longer descriptions can wrap inside the existing scrollable panel.

Why

Mobile previously rendered these options as label-only chips, hiding context that can be necessary to choose an answer. The structured-input contract already provides the descriptions, and the web and desktop clients already display them.

Fixes #7304.

UI Changes

Before	After

Full demo video

11-mixed-ballot-flow.mp4

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

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Note

Low Risk
Presentation-only changes in PendingUserInputCard; no API, selection, or submission logic changes.

Overview
Mobile pending user-input now surfaces each option’s description under its label when it differs from the label, aligning with web/desktop structured-input UX.

Options move from horizontal pill chips to full-width stacked rows (rounded-2xl, min-h-12) so longer descriptions can wrap inside the existing scrollable card. Selection and submit behavior are unchanged.

^{Reviewed by Cursor Bugbot for commit 7bc2ba5. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Show structured input option descriptions in PendingUserInputCard

• Options are now rendered as full-width vertically stacked buttons instead of horizontal pill-shaped chips, increasing touch target size.
• When option.description differs from option.label, it is displayed as a second line of text beneath the label.
• Behavioral Change: the layout change from horizontal wrap to vertical stack may affect screen space usage when many options are present.

^{Macroscope summarized 7bc2ba5.}

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[macroscopeapp]

Approvability

Verdict: Approved 7bc2ba5

This PR makes minor UI styling adjustments and conditionally renders option descriptions that already exist in the data. The changes are self-contained to display logic with no runtime behavior impact.

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