Release v4.190.3

Changed

• Hand-written command handler code now renders with a return type that follows its body: void when it returns nothing, the event type when it returns one new event, and IEnumerable<object> for yield return, collections or anything else, so a handler that returns a single event compiles. (#668)
• Stage Play and generated applications now use Scene 4.78.3.

Fixed

• A toolbar action on a list in Play waits for a selected row and acts on that row, instead of submitting an invented or previously held identifier, so commands such as Dispatch no longer fail with "does not exist". (#670)
• A screen on the ConfirmDialog blueprint plays as a decision dialog: one button per decision, only the chosen decision's inputs, no raw Execute ...Form captions, and the declared navigation runs after the command succeeds. (#672)
• Synthesized screens now bind their tables to the exposed query and their actions to the command's POST route, instead of showing 'No query is exposed'. (#680)
• Navigation rail items, sidebar entries and toolbar buttons now draw their authored icons in Play; generated applications install the Lucide icon library the icons come from. (#681)