feat: Add icon generation script and update README with new functionality

build/scripts/build_macos.sh

@@ -274,39 +274,50 @@ create_dmg() {
     else
         log_warning "create-dmg not found, using hdiutil (less stylish)"
         log_info "For professional DMG: brew install create-dmg"
-        
-        # Create temporary DMG directory structure
-        DMG_TEMP="$TEMP_BUILD/dmg_contents"
-        mkdir -p "$DMG_TEMP"
-        
-        # Copy app bundle
-        cp -r "$DIST_DIR/$APP_NAME.app" "$DMG_TEMP/"
-        
-        # Create symlink to Applications folder
-        ln -s /Applications "$DMG_TEMP/Applications"
 
-        # Build a small, HFS+ staging image first and then convert to
-        # compressed UDZO. This avoids oversized APFS container images.
+        # Build a writable HFS+ staging image, mount it, and copy the
+        # app bundle with ditto so symlinks are preserved exactly.
         STAGING_DMG="$TEMP_BUILD/${APP_NAME}-staging.dmg"
+        STAGING_MOUNT="$TEMP_BUILD/dmg_mount"
+        STAGING_EMPTY="$TEMP_BUILD/dmg_empty"
         rm -f "$STAGING_DMG"
+        rm -rf "$STAGING_MOUNT"
+        rm -rf "$STAGING_EMPTY"
+        mkdir -p "$STAGING_MOUNT"
+        mkdir -p "$STAGING_EMPTY"
+
+        APP_SIZE_KB=$(du -sk "$DIST_DIR/$APP_NAME.app" | awk '{print $1}')
+        DMG_SIZE_KB=$((APP_SIZE_KB + 512000))
 
         hdiutil create \
-            -volname "$DMG_VOLUME_NAME" \
-            -srcfolder "$DMG_TEMP" \
+            -size "${DMG_SIZE_KB}k" \
             -fs HFS+ \
-            -fsargs "-c c=64,a=16,e=16" \
+            -volname "$DMG_VOLUME_NAME" \
             -format UDRW \
+            -srcfolder "$STAGING_EMPTY" \
             -ov \
             "$STAGING_DMG"
 
+        hdiutil attach "$STAGING_DMG" \
+            -mountpoint "$STAGING_MOUNT" \
+            -nobrowse \
+            -noverify \
+            -noautoopen
+
+        ditto "$DIST_DIR/$APP_NAME.app" "$STAGING_MOUNT/$APP_NAME.app"
+        ln -s /Applications "$STAGING_MOUNT/Applications"
+
+        hdiutil detach "$STAGING_MOUNT"
+
         hdiutil convert "$STAGING_DMG" \
             -format UDZO \
             -imagekey zlib-level=9 \
             -o "$DMG_FILE"
-        
+
         # Clean up
         rm -f "$STAGING_DMG"
-        rm -rf "$DMG_TEMP"
+        rm -rf "$STAGING_MOUNT"
+        rm -rf "$STAGING_EMPTY"
     fi
 
     if [ ! -f "$DMG_FILE" ]; then