#540: #448-C: Flip GTK main loop from Relm4 to ShellApp runner; delete Relm4 scaffolding (sub-task 3/3 of #448)

Cargo.toml

@@ -37,7 +37,7 @@ default = ["gui"]
 # `quadraui/gtk` enables the public `quadraui::gtk::draw_*` rasterisers
 # (#223). vimcode adopts them one primitive at a time inside
 # `src/gtk/quadraui_gtk.rs`.
-gui = ["gtk4", "relm4", "pangocairo", "gio", "quadraui/gtk"]
+gui = ["gtk4", "pangocairo", "gio", "quadraui/gtk"]
 
 [dependencies]
 # `quadraui/tui` enables the public `quadraui::tui::draw_*` rasterisers
@@ -51,7 +51,6 @@ gui = ["gtk4", "relm4", "pangocairo", "gio", "quadraui/gtk"]
 # currently disabled — see `.github/workflows/*.disabled`.
 quadraui = { path = "../quadraui/quadraui", features = ["tui", "terminal"] }
 gtk4 = { version = "0.7", features = ["v4_10"], optional = true }
-relm4 = { version = "0.7", optional = true }
 pangocairo = { version = "0.18", optional = true }
 ropey = "1.6.1"
 tree-sitter = "0.26"

src/core/engine/mod.rs

@@ -105,6 +105,8 @@ pub struct RegisteredAccelerator {
     /// (`(ctrl, shift, alt, key_name)`). `None` if the binding string is
     /// unparseable; the registration is still kept so `unregister_accelerator`
     /// can find it by id.
+    /// Dead in ShellApp mode until GTK accelerator lookup is re-wired.
+    #[allow(dead_code)]
     pub parsed: Option<(bool, bool, bool, String)>,
 }
 
@@ -1538,6 +1540,8 @@ pub struct PanelHoverPopup {
 
 impl PanelHoverPopup {
     /// Whether this hover comes from a native (trusted) panel like source_control.
+    /// Dead in ShellApp mode until panel hover is re-wired (#448-C follow-on).
+    #[allow(dead_code)]
     pub fn is_native(&self) -> bool {
         self.panel_name == "source_control"
     }
@@ -4347,6 +4351,8 @@ impl Engine {
     /// is_space, is_escape)` shape they already use with
     /// [`crate::render::matches_key_binding`], so this slots into existing
     /// key-handler sites without translation.
+    /// Dead in ShellApp mode until GTK accelerator matching is re-wired (#448-C follow-on).
+    #[allow(dead_code)]
     #[allow(clippy::too_many_arguments)]
     pub fn match_accelerator(
         &self,

src/core/engine/motions.rs

@@ -3298,6 +3298,9 @@ impl Engine {
     ///
     /// - `Ctrl+N` / `Ctrl+P` — always (start or cycle word completion).
     /// - `Tab` / `Down` / `Up` — only while a display-only popup is active.
+    ///
+    /// Dead in ShellApp mode until completion key intercept is re-wired (#448-C follow-on).
+    #[allow(dead_code)]
     pub fn insert_completion_intercepts_key(&self, key_name: &str, ctrl: bool) -> bool {
         if self.mode != Mode::Insert {
             return false;