FAZA 17: 2.5D Minecraft-Style Terrain + Y-Layer Stacking + Custom Sprites

COMPLETED FEATURES:

 Custom Sprite Integration:
- Player, Zombie, Merchant sprites (0.2 scale)
- 11 custom sprites + 5 asset packs loaded
- Auto-transparency processing (white/brown removal)
- Gravestone system with atlas extraction

 2.5D Minecraft-Style Terrain:
- Volumetric blocks with 25px thickness
- Strong left/right side shading (30%/50% darker)
- Minecraft-style texture patterns (grass, dirt, stone)
- Crisp black outlines for definition

 Y-Layer Stacking System:
- GRASS_FULL: All green (elevation > 0.7)
- GRASS_TOP: Green top + brown sides (elevation 0.4-0.7)
- DIRT: All brown (elevation < 0.4)
- Dynamic terrain depth based on height

 Floating Island World Edge:
- Stone cliff walls at map borders
- 2-tile transition zone
- Elevation flattening for cliff drop-off effect
- 100x100 world with defined boundaries

 Performance & Polish:
- Canvas renderer for pixel-perfect sharpness
- CSS image-rendering: crisp-edges
- willReadFrequently optimization
- No Canvas2D warnings

 Technical:
- 3D volumetric trees and rocks
- Hybrid rendering (2.5D terrain + 2D characters)
- Procedural texture generation
- Y-layer aware terrain type selection

FAZA_10_CHECKLIST.md

@@ -0,0 +1,64 @@
+# FAZA 10: Ekonomija in Trgovina - Checklist
+
+**Status:** ✅ ZAKLJUČENO
+
+**Datum:** 2025-12-06
+
+---
+
+## ✅ Opravila (Developer)
+
+- [x] Implementacija `InventorySystem` (Gold Tracking):
+    - [x] Shranjevanje zlata (Gold).
+    - [x] UI prikaz zlata (desno zgoraj).
+- [x] NPC Interakcija (`InteractionSystem.js`):
+    - [x] Detekcija klika na NPC-ja (povečan radij).
+    - [x] Identifikacija 'merchant' tipa.
+- [x] Trgovina Logika:
+    - [x] Prodaja: Wheat -> Gold (5g/item).
+    - [x] Nakup: Gold -> Seeds (10g/5 items).
+    - [x] Visual feedback (+Gold/-Gold text popup).
+- [x] Integracija v GameScene.
+
+---
+
+## 🧪 Ročno testiranje (Naročnik)
+
+### Test 1: Prodaja
+**Ukaz:** Imej pridelke (Wheat) in klikni na NPC-ja (Merchanta).
+
+**Pričakovani rezultat:**
+- [x] Zlato se poveča (+5 na item).
+- [x] Pridelki izginejo iz inventarja.
+
+### Test 2: Nakup
+**Ukaz:** Bodi brez pšenice, imej zlato (>10) in klikni na NPC-ja.
+
+**Pričakovani rezultat:**
+- [x] Zlato se zmanjša (-10).
+- [x] Število semen v inventarju se poveča (+5).
+
+---
+
+## 📋 Potrditev Naročnika
+
+```
+FAZA 10: [STATUS]
+- Testirano: [DA]
+- Datum testiranja: 2025-12-06
+- Opombe: Uporabnik potrdil: "dela"
+
+ODOBRENO ZA FAZO 11: [DA]
+
+Podpis naročnika: User
+```
+
+---
+
+## ➡️ Naslednji koraki (po odobritvi)
+
+Ko naročnik potrdi FAZO 10, se začne:
+**FAZA 11: Gradnja in Obnova (Building)**
+- Poraba materialov (Wood, Stone, Gold) za gradnjo.
+- Postavljanje objektov na mrežo (npr. Ograja, Hiša).
+- UI za izbiro gradnje.