Implement Aegis dashboard transaction review modal

[panditdhamdhere]

Summary

• Add shared TransactionReviewModal and operationSummary mapper for transfer, mint, whitelist, and compliance-update actions.
• Show operation type, target, asset, network, expected result, and risk notes before signing.
• Wire mapper into sensitive flows and keep copy protocol-level (no legal overclaiming).
• Add fixtures, tests, and docs for review-before-sign behaviour.

Closes #177

Acceptance criteria

• Transaction review modal is implemented
• Sensitive operation summaries are displayed
• Risk notes are included
• Network and target details are shown
• Tests or fixtures cover major operation types
• Docs explain review behaviour

Test plan

• Open a transfer from /portfolio, reach review, confirm expected result + risk notes appear before Confirm & Sign
• Run mint from /admin (MintWorkflow) and verify review summary includes asset, target, network
• Add/remove whitelist address and confirm TransactionReviewModal opens with protocol disclaimer
• Bulk compliance update shows network + review summary before confirm
• npm test and npm run build pass