v0.7.0

Added

• Added PNG and JPG export buttons for the currently visible flowchart canvas.
• Added session-local drag positioning for scope, flow, and inline decision blocks, with reset restoring the automatic progressive layout.

Changed

• Reworked the viewer canvas toward a single progressive flowchart: scopes expand into entrypoint/call rows, selected decision charts unfold in that same route, and selected links highlight their source and target while unrelated blocks dim.
• Unified scope nodes with the rest of the canvas block styling so top-level areas do not read as a separate visual component family.