v1.1.2: action button, responsive faders, label scaling

Third integration-feedback release from building the streaming studio.

- New `Button` — a click-to-fire command button in the panel style, the
  non-latching sibling of PushButton. Implemented as PushButton's new
  `mode="action"` (never latches, press-down + brief LED flash, `onClick`);
  led="dot" (default) matches the corner-dot look, led={false} is plain.
- `fill` on LEDFader (parity with Fader) — faders stretch to fill their
  container in resizable panels instead of a fixed pixel length.
- `labelSize` on IndicatorLamp (and LampRow) — shrink the caption below its
  10px floor to match dense header rows.
- Docs: a dedicated "Buttons & switches" section with a decision guide
  (Button/PushButton/TransportButton/ToggleSwitch/SegmentSwitch) + live demos.

Library + docs typecheck and build; 38 tests pass.

packages/dreamknob/src/skins/LampRow.tsx

@@ -11,6 +11,8 @@ export interface LampRowProps {
   lamps: readonly LampRowItem[];
   /** Lamp diameter in px. Default: 9. */
   size?: number;
+  /** Caption font size in px. Default: 9.5. */
+  labelSize?: number;
   /** Caption placement relative to each lamp. Default: 'right'. */
   labelPosition?: 'right' | 'below';
   /** Make lamps clickable (a compact indicator toggle bank). */
@@ -31,6 +33,7 @@ export interface LampRowProps {
 export const LampRow: React.FC<LampRowProps> = ({
   lamps,
   size = 9,
+  labelSize,
   labelPosition = 'right',
   onToggle,
   gap = 14,
@@ -80,7 +83,7 @@ export const LampRow: React.FC<LampRowProps> = ({
           <span
             style={{
               fontFamily: theme.fontUI,
-              fontSize: 9.5,
+              fontSize: labelSize ?? 9.5,
               fontWeight: 600,
               letterSpacing: '0.12em',
               textTransform: 'uppercase',