yoda: add ↑↓ buttons next to drag handle in toolbar editor

DnD source+destination wiring from 1cf17dc builds but the drag-drop
doesn't fire reliably in practice (suspected: either dnd_source's
shell.capture_event() on CursorMoved swallows events the destination
needs to see, or intra-window DnD has a Wayland-specific hiccup on the
current sctk/cosmic-comp pairing).

Adds two plain click-handled buttons per enabled row (↑ go-up-symbolic,
↓ go-down-symbolic, both disabled at list edges) so reorder is
functional regardless of DnD state. Backed by new messages
ToolbarMoveUp / ToolbarMoveDown that swap adjacent positions in the
Vec<ToolbarAction>.

The drag handle + DnD source/destination wrapping stays in place — if
DnD gets fixed upstream or on a future libcosmic it'll Just Work, and
the arrows remain as a keyboard-friendly fallback.

src/app.rs

@@ -551,6 +551,10 @@ pub enum Message {
     ToolbarAdd(ToolbarAction),
     ToolbarRemove(ToolbarAction),
     ToolbarReorder { src: ToolbarAction, target: ToolbarAction },
+    /// Move one step up (toward index 0) inside the enabled toolbar list.
+    ToolbarMoveUp(ToolbarAction),
+    /// Move one step down (toward the end) inside the enabled toolbar list.
+    ToolbarMoveDown(ToolbarAction),
     ToolbarReset,
     SetTypeToSearch(TypeToSearch),
     SystemThemeModeChange,
@@ -2416,12 +2420,27 @@ impl App {
                 .into()
         };
 
-        let row_enabled = |action: ToolbarAction| -> Element<'_, Message> {
+        let row_enabled = |action: ToolbarAction, pos: usize, last: usize| -> Element<'_, Message> {
             let (icon, label, _msg) = toolbar_action_ui(action);
+            let up_btn = widget::button::icon(widget::icon::from_name("go-up-symbolic").size(14));
+            let up_btn = if pos > 0 {
+                up_btn.on_press(Message::ToolbarMoveUp(action))
+            } else {
+                up_btn
+            };
+            let down_btn = widget::button::icon(widget::icon::from_name("go-down-symbolic").size(14));
+            let down_btn = if pos < last {
+                down_btn.on_press(Message::ToolbarMoveDown(action))
+            } else {
+                down_btn
+            };
+
             let row_content: Element<_> = widget::row::with_children(vec![
                 drag_icon(14),
                 widget::icon::from_name(icon).size(16).into(),
                 widget::text::body(label).width(Length::Fill).into(),
+                up_btn.into(),
+                down_btn.into(),
                 widget::button::icon(widget::icon::from_name("list-remove-symbolic").size(14))
                     .on_press(Message::ToolbarRemove(action))
                     .into(),
@@ -2476,8 +2495,9 @@ impl App {
             section = section
                 .add(widget::text::body(fl!("toolbar-empty-hint")));
         } else {
-            for a in enabled.iter().copied() {
+            let last = enabled.len() - 1;
-                section = section.add(row_enabled(a));
+            for (pos, a) in enabled.iter().copied().enumerate() {
+                section = section.add(row_enabled(a, pos, last));
             }
         }
 
@@ -4615,6 +4635,28 @@ impl Application for App {
                 }
                 return Task::none();
             }
+            Message::ToolbarMoveUp(action) => {
+                let mut tb = self.config.toolbar.clone();
+                if let Some(i) = tb.iter().position(|a| a == &action)
+                    && i > 0
+                {
+                    tb.swap(i, i - 1);
+                    config_set!(toolbar, tb);
+                    return self.update_config();
+                }
+                return Task::none();
+            }
+            Message::ToolbarMoveDown(action) => {
+                let mut tb = self.config.toolbar.clone();
+                if let Some(i) = tb.iter().position(|a| a == &action)
+                    && i + 1 < tb.len()
+                {
+                    tb.swap(i, i + 1);
+                    config_set!(toolbar, tb);
+                    return self.update_config();
+                }
+                return Task::none();
+            }
             Message::ToolbarReset => {
                 config_set!(toolbar, default_toolbar());
                 return self.update_config();