liquid-glass Slider

Root owns value/defaultValue, min/max/step, disabled/readOnly, orientation and direction. Track uses shared normalized AxisInput for real pointer/touch drag. Thumb is one focusable slider: arrows, Shift×10, PageUp/PageDown, Home/End; horizontal RTL reverses lateral arrows. Values clamp and snap from min. Controlled requests emit valueChange while retaining owner values; valueCommit marks completion, cancel restores an uncontrolled drag start. Label names Thumb; Value and Indicator are passive. Single-thumb behavior is implemented; multi-thumb constraints remain open.

Use FieldThumb instead of Thumb inside Field/FormField to bridge FieldLabel activation, canonical numeric validation, policy, Form serialization and reset. Standalone Thumb continues to use SliderLabel.

Parts: root, label, track, indicator, thumb, field-thumb, value. All four styled families inherit Base behavior.

Draft source work. Full native, assistive-technology, Adapter/Compiler/GPUI, package consumer and independent acceptance remain open. No Finf completion is claimed.