v0.17.0

• move the lens model into core and fix its review findings
• list a focused lens name's references beside the diff, and add # to cycle back
• drop the lens strip and draw the inline labels in red
• label each lens name with its digit on the line it was opened on
• add the symbol lens: * colours a line's names and their uses in the diff
• copy every selected status row with y, one per line
• update the readme demo gif
• keep the cursor on its line inside a card when rows rebuild

Full changelog: v0.16.1...v0.17.0