feat: Add streaming pipe support for async loading in.

crates/pikl-core/src/model/event.rs

@@ -53,6 +53,7 @@ pub enum Action {
     RemoveItems(Vec<usize>),
     ProcessHookResponse(HookResponse),
     CloseMenu,
+    StreamingDone,
 }
 
 /// Broadcast from the menu loop to all subscribers
@@ -81,6 +82,8 @@ pub struct ViewState {
     pub mode: Mode,
     pub selection_count: usize,
     pub multi_enabled: bool,
+    /// True while stdin is still streaming items in.
+    pub streaming: bool,
     /// Column headers for table mode. None when not in
     /// table mode.
     pub columns: Option<Vec<ColumnHeader>>,