initial public release.

public/chat/error_no_selected_region.md

@@ -0,0 +1,10 @@
+### No Region Selected
+
+To proceed, please select a MIDI region in the track view or open a region in the piano roll.
+
+Tips:
+- Double-click in a track to create a new MIDI region, then select it.
+- Click an existing region to select it.
+- Use the Piano button to open the active region in the piano roll.
+
+After selecting a region, try your request again.