LogicChart v0.8.0

Added

• Added dedicated viewer documentation covering the progressive flowchart product shape,
  the static and React runtime split, layout invariants, and browser verification loop.
• Added React-viewer viewport panning with reset coverage in the frontend test suite.

Changed

• Clarified README and contributor instructions for the framework-backed viewer runtime,
  generated runtime bundle, cache-busted browser checks, and viewer-specific gates.

Fixed

• Fixed the React viewer so clicking empty canvas space clears selected connections, and
  dimmed scope-entry links now fade consistently with dimmed canvas nodes.