Generated UI debug panel for chain/manifest/ABI diagnostics

[snissn]

Background

When generated apps fail locally, debugging chain/manifest/ABI mismatch is slow.

Goal

Add an optional debug panel to generated UI for fast diagnosis in dev/PoC environments.

Scope

• Debug panel visible in dev mode (or guarded by explicit env flag).
• Show chain ID, connected wallet, deployment address, manifest status.
• Show key ABI function presence checks per collection.
• Show last RPC/contract error with context.

Implementation Notes

• Keep panel non-intrusive and disabled in production export by default.
• Do not leak secrets.

Acceptance Criteria

• Panel quickly surfaces common mismatch problems (wrong chain, zero address, ABI drift).
• User can copy diagnostics payload for issue reports.
• Tests verify panel render gating and key fields.