feat(miden): migrate widget demo to 0.16 testnet

[jasspreetbawa13]

Summary

• migrate the widget and demo wallet flow to Miden 0.16 testnet
• resolve current testnet faucet IDs from the local commons SDK
• stabilize wallet asset reads and canonical asset comparisons

Validation

• npm run build
• cd demo && npm run typecheck && npm run build

[vercel]

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Project	Deployment	Actions	Updated
epoch-widget	Error		Sep 15, 2026 5:54pm UTC

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit 9687890.}