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/assets/property-close-hover.svg

@@ -1,10 +1,6 @@
 <svg width="44" height="30" viewBox="0 0 44 30" fill="none" xmlns="http://www.w3.org/2000/svg">
-<rect width="44" height="30" fill="#F5F5F5"/>
 <g id="2. &#237;&#151;&#164;&#235;&#141;&#148;">
-<path d="M-2243 -4131C-2243 -4132.1 -2242.1 -4133 -2241 -4133H3016C3017.1 -4133 3018 -4132.1 3018 -4131V8497C3018 8498.1 3017.1 8499 3016 8499H-2241C-2242.1 8499 -2243 8498.1 -2243 8497V-4131Z" fill="white"/>
-<path d="M-2241 -4132H3016V-4134H-2241V-4132ZM3017 -4131V8497H3019V-4131H3017ZM3016 8498H-2241V8500H3016V8498ZM-2242 8497V-4131H-2244V8497H-2242ZM-2241 8498C-2241.55 8498 -2242 8497.55 -2242 8497H-2244C-2244 8498.66 -2242.66 8500 -2241 8500V8498ZM3017 8497C3017 8497.55 3016.55 8498 3016 8498V8500C3017.66 8500 3019 8498.66 3019 8497H3017ZM3016 -4132C3016.55 -4132 3017 -4131.55 3017 -4131H3019C3019 -4132.66 3017.66 -4134 3016 -4134V-4132ZM-2241 -4134C-2242.66 -4134 -2244 -4132.66 -2244 -4131H-2242C-2242 -4131.55 -2241.55 -4132 -2241 -4132V-4134Z" fill="black" fill-opacity="0.1"/>
 <g id="btn_close popup">
-<rect x="-19.5" y="-69.5" width="83" height="119" rx="4.5" stroke="#9747FF" stroke-dasharray="10 5"/>
 <g id="Property 1=Variant2">
 <g id="Rectangle 7347">
 <path d="M0 0H41C42.6569 0 44 1.34315 44 3V30H0V0Z" fill="url(#paint0_linear_25_48)"/>