Add e-shop route with product catalog and cart functionality

[Copilot]

Implements /eshop route in the Next.js dashboard per PR #7 requirements. Full-featured e-commerce interface for privacy/security products.

Implementation

• Route: /dashboard/src/app/eshop/page.tsx using Next.js 15 App Router with 'use client' directive
• Product Catalog: 12 privacy-themed products with stock management, pricing in SOL, category classification
• Cart System: State-driven shopping cart with quantity controls, stock validation, slide-out panel UI
• Search & Filters: Real-time search, category pills, dual-slider price range with min/max validation, multi-sort options (featured/name/price)
• UI/UX: Tactical glass aesthetic matching existing SolVoid design, Framer Motion animations, responsive grid (1-4 columns)

Key Technical Details

// Price range validation ensures min ≤ max
onChange={(e) => {
  const newMin = parseFloat(e.target.value);
  setPriceRange([newMin, Math.max(newMin, priceRange[1])]);
}}

• TypeScript with proper interfaces for Product and CartItem
• State management via React hooks (useState, useMemo for filtered/sorted products)
• Accessibility: aria-labels on range inputs and select controls
• Zero security issues (CodeQL verified)

Product Data Structure

Products include category classification (Privacy Tools, Hardware, Software, Services, Credits, Education), stock levels, featured flag, and emoji-based placeholders for product images.

Original prompt

Pull request: https://github.com/paseka10jaroslav-coder/SolVoid/pull/7/files

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