💡 Expand proposing of a new constitution Governance Action for an offchain discussion with advanced features

### Area

Proposal Pillar

### Is there new design needed?

Yes

### What?

Enhance the Cardano GovTool to allow users to propose:
- A **completely new** constitution.
- Changes to the **existing** constitution.
- A **new guardrails script** for the constitution.
Advanced comparison features will enable users to **visualize** differences between the current and proposed constitutions efficiently.

### Why?

- Cardano governance evolves, requiring a **structured and transparent** way to modify or replace its constitution.
- A robust **comparison tool** reduces ambiguity and improves decision-making.
- Guardrails scripts ensure that constitutional changes adhere to governance principles.

### How?

- **Text Diff Algorithm** (e.g., Myers diff, Levenshtein, or Google diff-match-patch) for highlighting changes.

### (Optional) User Story with acceptance criteria

_No response_