initial custom UI anchors core

[Car-Role]

Core version for this PR

runelite/plugin-hub#10115

[raiyni]

This pr has the same fundamental flaws as your hub pr and seeing as it looks LLM generated, I'm not sure you understand what I mean.

[Car-Role]

This pr has the same fundamental flaws as your hub pr and seeing as it looks LLM generated, I'm not sure you understand what I mean.

I appreciate the feedback, but I'm having trouble understanding the technical issues you're describing. I'm not experienced with RuneLite's internal architecture. I do not know the delineation of what "core" means in terms of rendering encapsulation. I have no clue how a complex feature would function without some level of UI housed in a side panel, so, I started there. I do not expect this to be merged in one pass. Talking down to someone who is volunteering their time and contributing to a project shouldn't be acceptable behavior.

Can you provide more specific technical details about:

• What "clashing with the core overlay renderer" means in practice with specifics to what has been built
• Where in the rendering pipeline this positioning logic should hook in

[Car-Role]

This pr has the same fundamental flaws as your hub pr and seeing as it looks LLM generated, I'm not sure you understand what I mean.

refactored to use OverlayAnchorManager and integrate anchor rendering into OverlayRenderer