feat: reload.sh restarts quickshell components

The volume OSD drew only its "Output 72%" label, with the icon, bar and
device line clipped below the panel edge. The code and the theme were
not at fault: a hot reload fixed it, and a debug line logged just after
showed the volume row laid out correctly at the top of the panel. The
stuck state lived in the running process, so the fix is a restart.

quickshell has no reload subcommand and no IPC target for it, and a
hot reload needs a real content change to a file. reload.sh kills and
restarts each named component, or every directory holding a shell.qml,
and prints the qs count afterwards, since the process is qs and not
quickshell.

It must run from the user's terminal. A detached qs started from an
agent's tool call dies with the call, which would leave the desktop
without its shells; AGENTS.md now says so under Reloading.

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

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