v0.31.0-preview.0: Ranged reads, fuzzy editing, keyboard shortcuts v0.31.0-preview.0

Shipped ranged reads, limited searches, and fuzzy editing improvements that actually make the CLI feel snappier. Added Alt+D for forward word deletion, fixed some border colours, and now hints at --resume on exit because we know you'll want to jump back in. Also optimised height calculations and beefed up the docs, ngl this preview is lowkey fire.