mod(nav): button automatically resizes as necessary

src/main.zig

@@ -61,7 +61,6 @@ pub fn main() !void {
             var button: NavigationButton(.about) = .init(&app.model, &app.queue);
             try header.append(try .init(allocator, .{
                 .size = .{
-                    .dim = .{ .x = 5 + 2 },
                     .grow = .vertical,
                 },
             }, button.element()));
@@ -71,7 +70,6 @@ pub fn main() !void {
             var button: NavigationButton(.blog) = .init(&app.model, &app.queue);
             try header.append(try .init(allocator, .{
                 .size = .{
-                    .dim = .{ .x = 4 + 2 },
                     .grow = .vertical,
                 },
             }, button.element()));

src/navigation.zig

@@ -22,12 +22,17 @@ pub fn NavigationButton(App: type) fn (std.meta.FieldEnum(App.Event)) type {
                     return .{
                         .ptr = this,
                         .vtable = &.{
+                            .minSize = minSize,
                             .handle = handle,
                             .content = content,
                         },
                     };
                 }
 
+                fn minSize(_: *anyopaque, _: *const App.Model, _: zterm.Point) zterm.Point {
+                    return .{ .x = @tagName(page).len + 2 };
+                }
+
                 fn handle(ctx: *anyopaque, _: *App.Model, event: App.Event) !void {
                     const this: *@This() = @ptrCast(@alignCast(ctx));
                     switch (event) {