Tier 1: origin anchor, detents, theming, type-in editing, ImageKnob

- origin: bipolar anchor value — Arc from=center, Fader fill and
  LEDFader segments draw from origin instead of min/mid-travel
- detents + detentSize: magnetic snap while dragging (normalized
  space, wheel/keyboard unaffected); applyDetents exported
- DreamknobProvider + KnobTheme: accent/track/face/text/label/ticks/
  focusRing/fonts tokens with dark and light bases; every skin
  resolves defaults from the theme, instance props win
- editable + parseValue: double-click knobs (or click fader readouts)
  to type exact values; Enter/blur commits, Esc cancels, 1.2k parses;
  ValueInput + defaultParseValue exported; setValue added to context
- ImageKnob: film-strip sprite knob (KnobMan-style strips), vertical
  or horizontal, with focus ring, editing, value/label
- Docs: LED gallery cards for film-strip/bipolar/editing/theming,
  playground editable toggle, theming API section, README updates

packages/dreamknob/src/index.ts

@@ -2,6 +2,16 @@
 export { useKnob, type UseKnobResult } from './hooks/useKnob';
 export { Knob, type KnobProps } from './components/Knob';
 export { useKnobContext, type KnobRenderContext } from './core/context';
+export {
+  DreamknobProvider,
+  useKnobTheme,
+  darkTheme,
+  lightTheme,
+  MONO_FONT,
+  UI_FONT,
+  type KnobTheme,
+  type DreamknobProviderProps,
+} from './core/theme';
 export type { KnobCoreProps, KnobState, InteractionMode } from './core/types';
 export {
   clamp,
@@ -9,6 +19,7 @@ export {
   snapToStep,
   decimalsFromStep,
   findClosest,
+  applyDetents,
   linearTaper,
   logTaper,
   powTaper,
@@ -31,6 +42,9 @@ export { KnobValue, KnobLabel, type KnobValueProps, type KnobLabelProps } from '
 // Digital
 export { SegmentDisplay, type SegmentDisplayProps } from './digital/SegmentDisplay';
 
+// Value editing
+export { defaultParseValue, ValueInput, type ValueInputProps } from './components/ValueInput';
+
 // Prebuilt skins
 export type { SkinProps } from './skins/shared';
 export { FlatKnob, type FlatKnobProps } from './skins/FlatKnob';
@@ -42,4 +56,5 @@ export { NeonKnob, type NeonKnobProps } from './skins/NeonKnob';
 export { SteppedKnob, type SteppedKnobProps } from './skins/SteppedKnob';
 export { Fader, type FaderProps } from './skins/Fader';
 export { LEDFader, type LEDFaderProps, type LEDFaderZone } from './skins/LEDFader';
+export { ImageKnob, type ImageKnobProps } from './skins/ImageKnob';
 export { GlowFilter, type GlowFilterProps } from './primitives/GlowFilter';