dsh-welcome-back v0.3.0

Superseded by v0.4.0 — do not install. This build registers a DSH Settings page that caused a renderer-startup regression; v0.2.2 removed that page, and v0.4.0 renumbers v0.2.2 as the current version.

DSH Settings integration and one-click disable.\n\n- Registers a Welcome Back tab in DSH Settings → Plugins\n- Toggle welcome-back reminders independently\n- Toggle the floating ◷ button independently\n- One-click disable turns off both reminder and floating button\n- The floating button can be restored from the DSH Settings tab\n\nDeclared compatibility remains >=0.2.0-rc.2 <0.2.1.