[FEATURE]: Support Curved-Boundary Bar Charts with Dynamic Phase/Threshold Detection

What problem does this feature solve?

In physical domain modeling (such as thermodynamic P-T phase diagrams), industrial monitoring, and multi-parameter threshold analysis, data visualization often requires representing dynamic bar elements within a two-dimensional parameter space that interact with non-linear, curved decision boundaries.

Current Limitations:

1. Linear/Static Boundaries: Current shapes/shapes annotations in Plotly primarily target horizontal, vertical, or simple linear lines. Defining polynomial or spline-based curved boundary lines for dynamic spatial partitioning is not natively streamlined.
2. Complex Collision Logic: Calculating real-time intersections (collision detection) between moving/resizing bar vertices (e.g., X position = Pressure, Y height = Temperature) and curved thresholds to dynamically update bar styling (e.g., solid, liquid, gas, or custom status) is mathematically complex to implement manually on top of standard trace types.

Expected Experience:

We hope Plotly could consider providing native support or built-in mechanisms for curved decision boundaries. When a bar's position along the X-axis or height along the Y-axis changes, the chart can evaluate its top vertex against curved boundaries to trigger real-time state changes and dynamic styling.

🔗 Live Demo & Repository

• Live Demo: https://cnlnr.github.io/Curved-Boundary-Bar-Chart/
• GitHub Repository: https://github.com/cnlnr/Curved-Boundary-Bar-Chart

Bắt đầu với bản demo trực tiếp và repository được liên kết, sau đó xem xét hỗ trợ hiện có của plotly.py cho shapes và annotations được mô tả trong issue. Không có file hoặc test cụ thể nào được xác định; hãy xác định phạm vi API và các tiêu chí chấp nhận cho đường biên cong, phát hiện va chạm và kiểu dáng thanh động trước khi triển khai.