chrome: drop side rails across boxes (zellij draws the pane border)

We run the agent inside a zellij fork that already draws a border around
the pane, so per-box verticals were redundant chrome. Body lines are now
indented into the box interior instead of railed, and the top/bottom
rules use straight end caps (a corner would curve toward a vertical that
is no longer there). Each file keeps the original glyphs documented so
the rounded box can be restored by flipping the cap constants back.

Backported from the installed set in ~/.pi/agent/extensions, which had
drifted ahead of this repo.

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