Build a single-page app that lets travelers catalog the physical souvenirs they've collected from trips — think fridge magnets, snow globes, local pottery, woven bracelets, and pressed flowers.

Each souvenir entry should capture:
- **Item name** and a short description
- **Destination** (city and country)
- **Date acquired**
- **Category** (e.g., Wearable, Edible, Decorative, Paper, Other)
- **A memory note** — one sentence about the moment of purchase or discovery
- **A mood tag** (😄 Joyful, 🥺 Sentimental, 😂 Funny, 🤩 Awe-struck)

The app should display all souvenirs in a browsable card grid. Users can filter by category or mood tag, and sort by date or destination alphabetically. Each card shows the item name, destination badge, category chip, mood emoji, and the memory note on hover or tap.

A persistent summary banner at the top should show the total souvenir count and the number of unique countries visited, calculated live from the saved entries. All data must persist in `localStorage` so the collection survives page reloads — no backend required.