Contour 0.7.0: GUI tabs, split panes, daemon mode & improved accessibility

Contour 0.7.0 introduces first-class GUI tabs, split panes, saved layouts, and a new terminal-styled interface, all aimed at improving workspace management.

This release adds an experimental daemon mode, letting sessions persist beyond the lifetime of their window and supporting remote connections.

Accessibility is enhanced with screen reader support, live caret tracking, and speech synthesis.

Advanced graphics protocols and major VT/Unicode compliance improvements are also included, alongside multiple performance and stability fixes.