[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

Beginne mit der verlinkten Live-Demo und dem Repository und prüfe anschließend die bestehende Unterstützung von plotly.py für Shapes und Annotations, die im Issue beschrieben ist. Es ist keine bestimmte Datei oder kein bestimmter Test angegeben; definiere vor der Implementierung den API-Umfang und die Akzeptanzkriterien für gekrümmte Begrenzungen, Kollisionserkennung und dynamisches Balken-Styling.