PNG 2 Layout v0.2.0

Highlights

• Added a split GUI workflow for alpha-monochrome and solid multicolor images.
• Added manual metal selection up to met5 with Tiny Tapeout guidance in the UI.
• Added an interactive background remover with Use In App reload support.
• Improved Manhattan and DRC-oriented cleanup for safer metal spacing behavior.
• Modernized the interface styling, progress/activity panel, and default sizing.
• Added Debian packaging so the app can be installed on other Ubuntu machines.

Validation

• python3 -m compileall src scripts/smoke_test.py
• python3 scripts/smoke_test.py
• dpkg-deb --info dist/png-2-layout_0.2.0_amd64.deb