feat(core): Add Quicklist function to return all visible via ctrl+Q.

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

@@ -59,4 +59,17 @@ pub trait Menu: Send + 'static {
     fn formatted_label(&self, _filtered_index: usize) -> Option<String> {
         None
     }
+
+    /// Collect all filtered items as (value, original_index) pairs.
+    /// Default implementation iterates filtered results using
+    /// existing trait methods.
+    fn collect_filtered(&self) -> Vec<(&serde_json::Value, usize)> {
+        (0..self.filtered_count())
+            .filter_map(|i| {
+                let value = self.serialize_filtered(i)?;
+                let orig = self.original_index(i)?;
+                Some((value, orig))
+            })
+            .collect()
+    }
 }