Remove the per-camera fisheye dewarp tool: the WebGL dewarp module
(shaders, init/render/toggle, per-channel dewarpState), the Dewarp
button, its CSS, the dewarp branches interleaved into the shared
wheel/dblclick/mousedown/mousemove/mouseup handlers, and the WebGL
context cleanup in newSession(). Normal digital zoom/pan, drag-reorder,
magnifier, and expand are unaffected. Also drop the dewarp mention from
the README.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
peji