feat(frontend): Implement configurable navbar component
Add fully customizable navbar component that renders on frontend
using settings from admin panel.
Features:
- 38 configurable options (colors, typography, spacing, effects)
- Responsive breakpoint support (sm, md, lg, xl, xxl)
- Position modes: sticky, static, fixed
- Let's Talk button with icon support
- Dropdown hover effects for desktop
- Mobile hamburger menu integration
- Bootstrap 5.3 compatible
- Box shadow and hover effects
File: template-parts/navbar-configurable.php
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Co-Authored-By: Claude <noreply@anthropic.com>
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