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>

shell/README.md

@@ -188,7 +188,6 @@ calls to the running shell. It does not start the shell.
 
 ```
 omarchy-shell shell ping
-omarchy-shell shell openBarConfig
 omarchy-shell shell toggle omarchy.menu '{"menu":"root"}'
 omarchy-shell shell listPlugins
 omarchy-shell shell rescanPlugins
@@ -256,7 +255,7 @@ becomes the authoritative file — we do **not** deep-merge defaults back in.
    like `Clock` and `AudioPanel` forward.
 5. **Third-party enabled ⇔ present.** A third-party plugin is enabled iff
    its id appears somewhere in shell.json. For full bar options, that means
-   `bar.id`; for bar widgets, the bar settings UI adds/removes layout entries;
+   `bar.id`; for bar widgets, `omarchy bar plugin` adds/removes layout entries;
    other plugin kinds are enabled with the shell IPC. First-party non-bar
    plugins are always enabled.
 6. **Multiple instances** are allowed when a manifest sets