fix: icon display in application menu

- Changed Icon path to absolute in desktop file
- Fixed icon file permissions (chmod 644)
- Icon now shows correctly in GNOME/KDE menus

Desktop file updated: Icon=umbrix → Icon=/usr/share/icons/hicolor/256x256/apps/umbrix.png

build-all-packages.sh

@@ -61,6 +61,7 @@ echo -e "${GREEN}✓${NC} Custom libcore integrated: $NEW_SIZE"
 # Step 5: Add icon and prepare data directory
 echo -e "\n${YELLOW}[5/6]${NC} Preparing bundle assets..."
 cp -f "$PROJECT_DIR/logo/ic_launcher_playstore.png" "$BUNDLE_DIR/umbrix.png"
+chmod 644 "$BUNDLE_DIR/umbrix.png"
 mkdir -p "$BUNDLE_DIR/data"
 echo -e "${GREEN}✓${NC} Icon and data directory ready"