Implement AnchorKit transaction summary model

[El-swaggerito]

Description

Difficulty: Expert

Type: Feature

Summary

Implement a shared transaction summary model.

Current Behaviour

Transaction previews may be shown differently across payment, anchor, and escrow examples.

Expected Behaviour

AnchorKit should provide a shared summary model with operation type, parties, amount, asset, network, fee, status, and warnings.

Suggested Implementation

Create summary types, builder utilities, web UI usage, fixtures, tests, and docs.

Files or Areas Likely Affected

• packages/transactions/
• packages/types/
• apps/web/
• examples/
• tests/
• docs/

Acceptance Criteria

• Transaction summary model is implemented.
• Payment, anchor, and escrow operations are represented.
• Warnings are supported where applicable.
• Web UI uses the shared model.
• Tests cover summary states.
• Docs explain summary limitations.

Additional Notes

This supports review-before-action UX.

[panditdhamdhere]

I would like to work on this