diff --git a/src/gtk/draw.rs b/src/gtk/draw.rs
index 3ca1bedd..50c8669b 100644
--- a/src/gtk/draw.rs
+++ b/src/gtk/draw.rs
@@ -2127,6 +2127,7 @@ pub(super) fn draw_dialog_popup(
         button_width: btn_max_w as f32,
         button_gap: button_gap as f32,
         padding: padding as f32,
+        table_height: 0.0,
     };
     let viewport = quadraui::Rect::new(0.0, 0.0, editor_width as f32, editor_height as f32);
     let dialog_layout = dialog.layout(viewport, measure, |_| {
diff --git a/src/gtk/mod.rs b/src/gtk/mod.rs
index 61a80e53..a045e971 100644
--- a/src/gtk/mod.rs
+++ b/src/gtk/mod.rs
@@ -10035,6 +10035,49 @@ impl App {
     }
 }
 
+// ── Dormant ShellApp impl (#448-B) ──────────────────────────────────────────
+// This impl compiles alongside the Relm4 path but is NOT wired up.
+// It will replace the Relm4 update loop in #448-C when the ShellApp runner
+// is activated.
+impl quadraui::ShellApp for App {
+    fn render_content(
+        &self,
+        _backend: &mut dyn quadraui::Backend,
+        _layout: &quadraui::AppShellLayout,
+    ) {
+        // Will delegate to the Cairo draw pipeline once wired in #448-C.
+        todo!()
+    }
+
+    fn handle(
+        &mut self,
+        event: quadraui::UiEvent,
+        _backend: &mut dyn quadraui::Backend,
+        _ctx: &quadraui::ShellContext<'_>,
+    ) -> quadraui::Reaction {
+        // Routes UiEvent variants to the same handlers as the Relm4 update path.
+        // handle_key_press and dispatch_engine_action both require a
+        // ComponentSender; the sender integration is deferred to #448-C.
+        match event {
+            quadraui::UiEvent::KeyPressed { .. } | quadraui::UiEvent::CharTyped(_) => {
+                // Delegate to self.handle_key_press(key_name, unicode, ctrl, alt, sender)
+                // once the ComponentSender is available via the ShellApp runner.
+                todo!()
+            }
+            quadraui::UiEvent::MouseDown { .. }
+            | quadraui::UiEvent::MouseUp { .. }
+            | quadraui::UiEvent::MouseMoved { .. }
+            | quadraui::UiEvent::DoubleClick { .. }
+            | quadraui::UiEvent::Scroll { .. } => {
+                // Route through self.dispatch_engine_action(action, sender, false)
+                // once the ComponentSender is available via the ShellApp runner.
+                todo!()
+            }
+            _ => quadraui::Reaction::Continue,
+        }
+    }
+}
+
 // view_row_to_buf_line and view_row_to_buf_pos_wrap are now shared functions
 // in render.rs — use render::view_row_to_buf_line / render::view_row_to_buf_pos_wrap.
 
diff --git a/src/render.rs b/src/render.rs
index ed664519..41daec24 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -2019,6 +2019,7 @@ pub fn debug_toolbar(engine: &Engine) -> quadraui::Toolbar {
                 session && stopped,
             ),
         ],
+        focused_index: None,
     }
 }
 
@@ -3723,6 +3724,7 @@ pub fn dialog_panel_to_quadraui_dialog(panel: &DialogPanel) -> quadraui::Dialog
                 cursor: None,
             })
         }),
+        table: None,
     }
 }
 
@@ -6496,6 +6498,7 @@ pub fn sc_button_toolbar(sc: &SourceControlData) -> quadraui::Toolbar {
             action(2, "", icons::GIT_PULL.s(), None, true),
             action(3, "", icons::GIT_SYNC.s(), None, true),
         ],
+        focused_index: None,
     }
 }
 
@@ -8147,6 +8150,7 @@ pub fn picker_panel_to_palette(picker: &PickerPanel) -> quadraui::Palette {
         show_query: true,
         create_label: None,
         preview,
+        mode: quadraui::PaletteMode::List,
     }
 }
 
diff --git a/src/tui_main/render_impl.rs b/src/tui_main/render_impl.rs
index b70938c0..14102df0 100644
--- a/src/tui_main/render_impl.rs
+++ b/src/tui_main/render_impl.rs
@@ -1032,6 +1032,7 @@ pub(super) fn draw_frame(
             button_width: capped_btn_w,
             button_gap: 0.0,
             padding: 1.0,
+            table_height: 0.0,
         };
         let layout = q_dialog.layout(viewport, measure, |_| {
             quadraui::ToolbarItemMeasure::new(0.0)
@@ -1148,6 +1149,7 @@ fn folder_picker_to_palette(picker: &FolderPickerState, popup_width: usize) -> q
         show_query: true,
         create_label: None,
         preview: None,
+        mode: quadraui::PaletteMode::List,
     }
 }