fix(sw): refine property panel and Firefox range styles

- Property bar ends after its last field (content width, scrolls when longer)
- Remove Figma canvas layers from property tool and close SVGs
- Suppress header field hover while the field's own dropdown is open
- Gauge: Figma red fill pill, beige track, Figma thumb SVG; shared
  paint for WebKit and Gecko (::-moz-range-*) so Firefox matches Chrome
- Story buttons for gauge external value / disabled / read-only
- Browser checks: follow-up fixes, Chrome vs Firefox range, close button

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/sw/src/components/sw-header/SWHeader.tsx

@@ -454,7 +454,7 @@ export const SWHeader = forwardRef<HTMLElement, SWHeaderProps>(function SWHeader
           <SWHeaderWindowControls onWindowMoveStart={onWindowMoveStart} onMinimize={onMinimize} onClose={onClose} showWindowMove={shown("windowMove")} showMinimize={shown("minimize")} showClose={shown("close")} />
         </div>}
       </div>
-      {barOpen && barData && <div className="hm-sw-header__bar-anchor" style={{ left: barOffset, width: `calc(100% - ${barOffset}px)` }}><SWHeaderPropertyBar {...barData} disabled={disabled || propertyBar?.disabled} id={barId} /></div>}
+      {barOpen && barData && <div className="hm-sw-header__bar-anchor" style={{ left: barOffset, maxWidth: `calc(100% - ${barOffset}px)` }}><SWHeaderPropertyBar {...barData} disabled={disabled || propertyBar?.disabled} id={barId} /></div>}
       {panelOpen && propertyPanel && <SWHeaderPropertyPanel {...propertyPanel} id={panelId} anchorRef={panelAnchorRef} onClose={closePanel} />}
     </header>
   )