feat(core): Add input modes and half-page cursor movement.

crates/pikl-core/tests/dsl_tests.rs

@@ -125,6 +125,34 @@ pikl_tests! {
             offset: 0
         }
     }
+
+    nav mod half_page {
+        viewport: { height: 10, count: 30 };
+
+        test half_page_down_from_top {
+            actions: [half-page-down]
+            cursor: 5
+            offset: 0
+        }
+
+        test half_page_up_from_middle {
+            actions: [half-page-down, half-page-down, half-page-up]
+            cursor: 5
+            offset: 1
+        }
+
+        test half_page_down_clamps_at_bottom {
+            actions: [half-page-down, half-page-down, half-page-down,
+                      half-page-down, half-page-down, half-page-down]
+            cursor: 29
+        }
+
+        test half_page_up_clamps_at_top {
+            actions: [half-page-down, half-page-up, half-page-up]
+            cursor: 0
+            offset: 0
+        }
+    }
 }
 
 // ---------------------------------------------------------------------------
@@ -192,4 +220,79 @@ pikl_tests! {
             cancelled
         }
     }
+
+    menu mod pipeline_queries {
+        items: ["error_log", "warning_temp", "info_log", "debug_temp"];
+
+        test exact_filter {
+            actions: [filter "'log", confirm]
+            selected: "error_log"
+        }
+
+        test exact_then_inverse {
+            actions: [filter "'log | !error", confirm]
+            selected: "info_log"
+        }
+
+        test cancel_pipeline {
+            actions: [filter "'xyz", cancel]
+            cancelled
+        }
+    }
+
+    menu mod mode_switching {
+        items: ["alpha", "bravo"];
+
+        test set_mode_and_confirm {
+            actions: [set-mode-normal, set-mode-insert, filter "bra", confirm]
+            selected: "bravo"
+        }
+    }
+
+    menu mod regex_pipeline {
+        items: ["item-001", "item-abc", "item-123"];
+
+        test regex_filter_confirm {
+            actions: [filter "/[0-9]+/", confirm]
+            selected: "item-001"
+        }
+    }
+
+    menu mod inverse_fuzzy {
+        items: ["alpha", "bravo"];
+
+        test exclude_alpha {
+            actions: [filter "!alpha", confirm]
+            selected: "bravo"
+        }
+    }
+
+    menu mod three_stage {
+        items: ["error_log_123", "warning_temp_456", "info_log_789", "debug_temp_012"];
+
+        test full_pipeline {
+            actions: [filter "'log | !error | /[0-9]+/", confirm]
+            selected: "info_log_789"
+        }
+    }
+
+    menu mod half_page_menu {
+        items: ["a","b","c","d","e","f","g","h","i","j"];
+
+        test half_page_then_confirm {
+            actions: [half-page-down, confirm]
+            // viewport height=50, half=25, clamps to last item (index 9)
+            selected: "j"
+        }
+    }
+
+    nav mod half_page_small_height {
+        viewport: { height: 2, count: 10 };
+
+        test half_page_moves_one {
+            actions: [half-page-down]
+            cursor: 1
+            offset: 0
+        }
+    }
 }