New Motion Slider plugin

plugins/motion-slider/README.md

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+# Motion Slider
+
+A FigUI plugin for camera motion control rigs running FluidNC with plain cartesian kinematics:
+
+- **X** — slide rail position (mm)
+- **Y** — pan head (degrees, driven as a linear axis)
+- **Z** — tilt head (degrees, driven as a linear axis)
+
+## Features
+
+- **Interactive 3D rig** — a virtual slider rendered with zero external dependencies (works on offline AP-mode controllers). Drag the orange carriage along the rail, the teal knob to pan, or the camera body to tilt. Empty space orbits the view, scroll/pinch zooms.
+- **Live virtual → machine sync** — enable *Live jog* and dragging the model streams throttled `$J=` jog commands so the real rig follows the virtual one. The machine's actual position is shown as a green ghost rig and in the HUD readouts.
+- **Position capture with millisecond timing** — capture the virtual or actual machine pose as keyframes. Each keyframe has an editable time in **ms**; the plugin converts distance ÷ time into the exact `G1 ... F` feed so every move takes precisely as long as you set. Identical poses become `G4` dwells. If a time is shorter than the machine's max rates allow, the keyframe shows a ⚠ warning and the feed is capped.
+- **Run / Hold / Resume** the sequence directly, or **save it as G-code** (`/sd/motion_slider.nc`) and open it in the main viewer/job control.
+- Rail travel auto-detects from `$130`; pan/tilt limits are configurable. Keyframes and settings persist on the controller via the plugin settings API.
+
+## Install
+
+Copy this folder to `/plugins/` (internal) or `/sd/plugins/` and refresh the Plugins tab, or use Plugins → Add.