Feat/shop and inventory and egg api handling

[Driedoutjerky]

Summary

• Egg stat calculation to depend only on the equipped decoration
• Connected inventory equip/unequip flow to egg stat recalculation
• Updated EggDashboardPage to display the current mock egg stats
• Shop and Inventory works.

Notes

• This is still frontend mock data only.
• Background and music equipment do not affect egg stats.
• Kept egg stage fixed at 1 for now
• Only one item per item type can be equipped at a time.
• Only equipped decoration affects glow, warmth, or weight.
• Egg stage-up logic is intentionally not implemented yet.

Testing

Tested locally with:

npm run dev

Then in devtools, execute codes as below.

localStorage.removeItem("memory_egg_egg");
localStorage.removeItem("memory_egg_shop_items");
localStorage.removeItem("memory_egg_user_items");
localStorage.setItem(
  "memory_egg_user",
  JSON.stringify({
    user_id: 1,
    email: "demo@nacimiento.app",
    nickname: "Wanderer",
    will_balance: 1000,
    created_at: new Date().toISOString()
  })
);

Expected Output

1. Default egg stats

• Go to /nest.
• Egg status should show:

Stage 1
Glow 0
Warmth 0
Weight 0

2. Decoration affects egg stats

• Go to /shop.
• Buy Warm Blanket, Tiny Lamp, and Shell Ribbon.
• Go to /inventory.
• Open Decorations.
• Equip Warm Blanket.
• Return to /nest.

Expected:

Glow 0
Warmth 15
Weight 0

3. Equipping another decoration replaces the previous decoration effect

• Go back to /inventory.
• Equip Tiny Lamp.
• Return to /nest.

Expected:

Glow 15
Warmth 0
Weight 0

4. Background/music do not affect stats

Equip a background or music item.
Return to /nest.

Expected: Egg stats should not change because only decorations affect stats.

5. Unequipping decoration clears stats

Unequip the currently equipped decoration.
Return to /nest.

Expected:

Glow 0
Warmth 0
Weight 0

6. Test purchasing item to see if it gets added to the inventory, and not repurchasable in shop

• Lack of credits should also block the purchase button.

[A1VERMAN]

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