Reduce summary line width when there is no fringe
It turns out the issue was not console mode per se, but the absence of a fringe. In graphical mode, the fringe effectively absorbs the newline allowing us to use the entire width. In console mode, or when fringe mode is disabled, we need to add the one-character offset. This should remove the need for the custom deft-width-offset variable, so it has been marked as obsolete.
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