🎨 refactor(model-pricing/header): unify header design, extract SearchActions, and improve skeleton

- Extract SearchActions.jsx and replace inline renderSearchActions in PricingVendorIntro.jsx for reuse
- Refactor PricingVendorIntro.jsx:
  - Introduce renderHeaderCard(), tagStyle, getCoverStyle(), and MAX_VISIBLE_AVATARS constant
  - Standardize vendor header cover (gradient + background image) and tag contrast
  - Use border instead of ring for vendor badges; unify visuals and remove Tailwind ring dependency
  - Rotate vendors every 2s only when filterVendor === 'all' and vendor count > 3
  - Remove unused imports; keep prop surface minimal; pass setShowFilterModal downward only
- Refactor PricingVendorIntroSkeleton.jsx:
  - Add getCoverStyle() and rect() helpers; rebuild skeleton to match final UI
  - Replace invalid Skeleton.Input usage; add missing keys; unify colors/borders/radius
- Update PricingTopSection.jsx:
  - Manage filter modal locally; drop redundant prop passing
- Update PricingVendorIntroWithSkeleton.jsx:
  - Align prop interface; forward only required props and keep useMinimumLoadingTime
- Add: web/src/components/table/model-pricing/layout/header/SearchActions.jsx
- Lint: all files pass; no dark:* classes present in this scope

Files touched:
- web/src/components/table/model-pricing/layout/header/PricingTopSection.jsx
- web/src/components/table/model-pricing/layout/header/PricingVendorIntro.jsx
- web/src/components/table/model-pricing/layout/header/PricingVendorIntroWithSkeleton.jsx
- web/src/components/table/model-pricing/layout/header/PricingVendorIntroSkeleton.jsx
- web/src/components/table/model-pricing/layout/header/SearchActions.jsx (new)

web/src/index.css

@@ -728,8 +728,8 @@ html.dark .with-pastel-balls::before {
 }
 
 .pricing-sidebar {
-  min-width: 460px;
-  max-width: 460px;
+  min-width: 400px;
+  max-width: 400px;
   height: calc(100vh - 60px);
   background-color: var(--semi-color-bg-0);
   overflow: auto;