Elliptic Curve Graphical Visualization

## Description:
Implement interactive visualization of elliptic curves over finite fields.

## User Story:
As a student learning ECC, I want to see visual representations of elliptic curves so that I can better understand the mathematical concepts.

Features:
- Plot elliptic curves over small finite fields
- Interactive point selection and operation visualization
- Zoom and pan functionality
- Animation of point addition operations

## Acceptance Criteria:
- [ ] Render curves accurately for small prime fields
- [ ] Interactive point selection works
- [ ] Point addition animation is smooth
- [ ] Works on both desktop and mobile

No files, tests, or entry points are named in the issue. Start by locating the existing TypeScript web application surface and determine where interactive visualizations belong. Done means accurate curves for small prime fields, point selection, smooth point-addition animation, zoom and pan, and desktop/mobile support.

Written by the indexing model from the issue text.