Drag the bar to move it, drop the config panel

Position the bar by dragging (or click-and-holding) empty bar space
toward a screen edge, with a ghost slab previewing the target edge.
With drag for position and double-click for transparency, the bar
config panel, its inline gear button, and the omarchy-launch-bar-settings
CLI are no longer needed.

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

test/shell.d/runtime-smoke-test.sh

@@ -116,7 +116,6 @@ jq -e '
 }
 pass "shell IPC returns effective shell config"
 
-[[ $(shell_ipc shell openBarConfig) == "ok" ]] || fail_with_log "shell IPC opens bar config panel"
 [[ $(shell_ipc shell summon omarchy.launcher '{"query":"term"}') == "ok" ]] || fail_with_log "shell IPC summons launcher overlay"
 shell_ipc_quiet shell hide omarchy.launcher >/dev/null
 [[ $(shell_ipc shell summon missing.plugin "{}") == "unknown" ]] || fail_with_log "shell IPC rejects unknown plugin"