pager: improve hover text handling

* align status truncating behavior with w3m (not exactly, clipping
  is still different, but this should be fine for now)
* add "su" for "show last alert"
	- w3m's solution here is to scroll one char at a time with
	  "u", but that's extremely annoying to use. We already have a
	  line editor that can navigate lines, so reuse that instead.
* fix peekCursor showing empty text
* update todo

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