refactor(ui): remove the viewport navigation bar

Sağ kenardaki dikey orbit/pan/zoom/zoom-extents araç çubuğu tümüyle
kaldırıldı: viewport render'ı, overlay::nav_toolbar fonksiyonu,
show_navbar state + ToggleNavbar mesajı/handler'ı, NAVBAR komutu, View
şeridindeki "Navigation Bar" aracı ve navbar modülü/ikonu. Aynı
gezinme işlemleri komutlar (3DORBIT, PAN, ZOOM*) ve ViewCube üzerinden
erişilebilir durumda.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/commands.rs

@@ -4756,11 +4756,6 @@ impl OpenCADStudio {
                 return Task::done(Message::ToggleViewCube);
             }
 
-            // ── NAVBAR — toggle navigation toolbar visibility ────────────────────
-            "NAVBAR" => {
-                return Task::done(Message::ToggleNavbar);
-            }
-
             // ── PROPERTIES — toggle Properties panel visibility ──────────────────
             "PROPERTIES" | "PR" | "PROPS" => {
                 return Task::done(Message::ToggleProperties);

src/app/mod.rs

@@ -74,8 +74,6 @@ pub(super) struct OpenCADStudio {
     show_ucs_icon: bool,
     /// Whether the ViewCube 3D gizmo is visible in model space (NAVVCUBE).
     show_viewcube: bool,
-    /// Whether the navigation toolbar is shown in the viewport (NAVBAR).
-    show_navbar: bool,
     /// Whether the Properties panel is shown on the left (PROPERTIES).
     show_properties: bool,
     /// Whether the document file tabs are shown at the top (FILETAB).
@@ -408,8 +406,6 @@ pub enum Message {
     ToggleGridSnap,
     /// Toggle the ViewCube 3D gizmo visibility (NAVVCUBE).
     ToggleViewCube,
-    /// Toggle the navigation toolbar visibility (NAVBAR).
-    ToggleNavbar,
     /// Toggle the Properties panel visibility (PROPERTIES).
     ToggleProperties,
     /// Toggle the document file tabs at the top (FILETAB).
@@ -746,7 +742,6 @@ impl OpenCADStudio {
             dyn_input: true,
             show_ucs_icon: true,
             show_viewcube: true,
-            show_navbar: true,
             show_properties: true,
             show_file_tabs: true,
             show_layout_tabs: true,

src/app/update.rs

@@ -2720,10 +2720,6 @@ impl OpenCADStudio {
                 self.show_viewcube ^= true;
                 Task::none()
             }
-            Message::ToggleNavbar => {
-                self.show_navbar ^= true;
-                Task::none()
-            }
             Message::ToggleProperties => {
                 self.show_properties ^= true;
                 Task::none()

src/app/view.rs

@@ -529,24 +529,6 @@ impl OpenCADStudio {
             .height(Fill)
         };
 
-        if self.show_navbar && !tab.is_start {
-            // Anchor the nav toolbar to the vertical centre of the
-            // viewport area, flush against the right edge with a small
-            // gutter, so it stays aligned no matter how tall the
-            // window is.
-            let nav = container(overlay::nav_toolbar())
-                .align_right(Fill)
-                .align_y(iced::alignment::Vertical::Center)
-                .height(Fill)
-                .padding(iced::Padding {
-                    top: 0.0,
-                    right: 8.0,
-                    bottom: 0.0,
-                    left: 0.0,
-                });
-            viewport_stack = viewport_stack.push(nav);
-        }
-
         if self.show_viewcube && !is_paper && !tab.is_start {
             let cube_click: Element<'_, Message> = container(
                 mouse_area(container(