[Markets] Build multi-outcome market rendering

[samuel2926i39-art]

Summary

Adds OutcomeList to render an arbitrary number of market outcomes with their individual odds/weights, replacing the assumption of a binary yes/no layout.

Context

• contracts/predict-iq/src/test_multi_outcome_voting.rs proves the contract supports more than two outcomes; the UI previously had no component to render that.
• Before: no generic outcome rendering existed (binary-only assumption in spec).
• After: any outcome count renders as a list of label + odds; once outcome count exceeds a threshold (default 6), the list becomes a scrollable region instead of breaking the layout.

Testing

• Manually verified rendering with 2, 3, and 10+ mock outcomes.
• Verified >6 outcomes triggers the scrollable container class rather than layout overflow.
• Verified empty-outcomes case renders a clear empty state rather than a blank/broken list.

Closes #1363

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