Update CIP-179 survey support to v5

[Cerkoryn]

Summary

Updates CGov’s existing CIP-179 implementation to the stable v5 specification, superseding the earlier implementation introduced in #109.

• Replaces the legacy local codec with the reusable cip-179 package.
• Renders linked surveys and their presentation metadata on governance action pages.
• Supports the v5 public survey question and response types available to DReps.
• Encodes survey responses as native CIP-179 label-17 transaction metadata alongside the governance vote.
• Handles invalid, closed, unsupported, and unavailable surveys without blocking the governance vote.
• Fixes survey input stability and linked-survey page layout.

This frontend change is intended to be used with the companion cgov-api CIP-179 v5 PR.

Verification

• npm run lint
• npm run test:cip179
• npx tsc --noEmit

All four focused CIP-179 tests pass. The only lint warning is an existing unrelated <img> warning in AIChatPanel.tsx.

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Project	Deployment	Actions	Updated (UTC)
cgov	Error		Jul 20, 2026 8:06am