Update SearchBar component

[Dustin-Reyes]

Enhance SearchBar component for menu search functionality.

Tasks:

• Update existing SearchBar or create new version
• Add search input with magnifying glass icon
• Add filter button on right side
• Implement sticky positioning below header
• Mobile: full width with padding
• Desktop: max-width container
• Add debounced input handling
• Style with existing theme

Acceptance Criteria:

• Search bar is sticky on scroll
• Input is debounced (300ms)
• Filter button is clickable
• Responsive layout works
• Uses theme colors and spacing
• Accessible (labels, focus states)

Sprint: 2 - Core Components