🎨 feat: Implement responsive design for SelectableButtonGroup component

This commit introduces a comprehensive responsive design system for the SelectableButtonGroup component that adapts to container width changes, particularly optimized for dynamic sidebar layouts.

## Key Features

### 1. Container Width Detection
- Added `useContainerWidth` hook using ResizeObserver API
- Real-time container width monitoring for responsive calculations
- Automatic layout adjustments based on available space

### 2. Intelligent Column Layout
Implements a 4-tier responsive system:
- **≤280px**: 1 column + tags (mobile portrait)
- **281-380px**: 2 columns + tags (narrow screens)
- **381-460px**: 3 columns - tags (general case, prioritizes readability)
- **>460px**: 3 columns + tags (wide screens, full feature display)

### 3. Dynamic Tag Visibility
- Tags automatically hide in medium-width containers (381-460px) to improve text readability
- Tags show in narrow and wide containers where space allows for optimal UX
- Responsive threshold ensures content clarity across all viewport sizes

### 4. Adaptive Grid Spacing
- Compact spacing `[4,4]` for containers ≤400px
- Standard spacing `[6,6]` for larger containers
- Additional `.sbg-compact` CSS class for fine-tuned styling in narrow layouts

### 5. Sidebar Integration
- Perfectly compatible with dynamic sidebar width: `clamp(280px, 24vw, 520px)`
- Automatically adjusts as sidebar scales with viewport changes
- Maintains optimal button density and information display at all sizes

## Technical Implementation

- **Hook**: `useContainerWidth.js` - ResizeObserver-based width detection
- **Component**: Enhanced `SelectableButtonGroup.jsx` with responsive logic
- **Styling**: Added `.sbg-compact` mode in `index.css`
- **Performance**: Efficient span calculation using `Math.floor(24 / perRow)`

## Benefits

- Improved UX across all screen sizes and sidebar configurations
- Better text readability through intelligent tag hiding
- Seamless integration with existing responsive sidebar system
- Maintains component functionality while optimizing space utilization

Closes: Responsive design implementation for model marketplace sidebar components

web/src/index.css

@@ -728,8 +728,9 @@ html.dark .with-pastel-balls::before {
 }
 
 .pricing-sidebar {
-  min-width: 400px;
-  max-width: 400px;
+  width: clamp(280px, 24vw, 520px) !important;
+  min-width: clamp(280px, 24vw, 520px) !important;
+  max-width: clamp(280px, 24vw, 520px) !important;
   height: calc(100vh - 60px);
   background-color: var(--semi-color-bg-0);
   overflow: auto;