eshell: align the arrows in the output of "j -l"HEADmaster

* eshell-conf.el (eshell/j): Update the usage text to the new format.

(eshell-j-recent-label): New face for the label of recent directories.

(eshell-j-space-with-width, eshell-j-width): Functions to work with
strings, in pixels on graphical displays and in columns otherwise.

(eshell-j): When listing candidates, print every item as
"DISPLAY -> PATH"
with the arrows aligned at the same column.  Recent directories now
have the label "RECENT", and claude sessions use
"TITLE -> PATH"
instead of "TITLE: PATH".
The mark directory itself is labelled "marks".

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

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