input: add direct set_surface_title and set_tab_title actions

Fixes #11316

This mirrors the `prompt` actions (hence why there is no window action
here) and enables setting titles via keybind actions which importantly
lets this work via command palettes, App Intents, AppleScript, etc.

src/apprt/action.zig

@@ -201,6 +201,9 @@ pub const Action = union(Key) {
     /// Set the title of the target to the requested value.
     set_title: SetTitle,
 
+    /// Set the tab title override for the target's tab.
+    set_tab_title: SetTitle,
+
     /// Set the title of the target to a prompted value. It is up to
     /// the apprt to prompt. The value specifies whether to prompt for the
     /// surface title or the tab title.
@@ -375,6 +378,7 @@ pub const Action = union(Key) {
         render_inspector,
         desktop_notification,
         set_title,
+        set_tab_title,
         prompt_title,
         pwd,
         mouse_shape,

src/apprt/gtk/class/application.zig

@@ -740,6 +740,7 @@ pub const Application = extern struct {
             .scrollbar => Action.scrollbar(target, value),
 
             .set_title => Action.setTitle(target, value),
+            .set_tab_title => return Action.setTabTitle(target, value),
 
             .show_child_exited => return Action.showChildExited(target, value),
 
@@ -2545,6 +2546,30 @@ const Action = struct {
         }
     }
 
+    pub fn setTabTitle(
+        target: apprt.Target,
+        value: apprt.action.SetTitle,
+    ) bool {
+        switch (target) {
+            .app => {
+                log.warn("set_tab_title to app is unexpected", .{});
+                return false;
+            },
+            .surface => |core| {
+                const surface = core.rt_surface.surface;
+                const tab = ext.getAncestor(
+                    Tab,
+                    surface.as(gtk.Widget),
+                ) orelse {
+                    log.warn("surface is not in a tab, ignoring set_tab_title", .{});
+                    return false;
+                };
+                tab.setTitleOverride(if (value.title.len == 0) null else value.title);
+                return true;
+            },
+        }
+    }
+
     pub fn showChildExited(
         target: apprt.Target,
         value: apprt.surface.Message.ChildExited,