feat: add restart.sh

Editing the layout table or a widget needs a conky restart and nothing
else, since the Lua is symlinked and conky never rereads its config.
That was three commands to remember, one of them the hyprctl dispatch
form that keeps the dashboard from popping open over the screen.

The script syntax-checks before killing anything and refuses to restart
on a Lua error, naming the file and line. Without that the first sign of
a typo is a blank workspace with no message on any stream, which is the
single most confusing failure mode this project has.

Falls back to a plain exec where Hyprland is not running, and says what
to run by hand if conky fails to come up.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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