ui: integrate egui-tabs for notes & replies selector

demo: https://cdn.jb55.com/s/notedeck-tabs.mp4

Fixes: https://github.com/damus-io/notedeck/issues/47
Signed-off-by: William Casarin <jb55@jb55.com>

src/app_creation.rs

@@ -41,6 +41,10 @@ pub fn setup_cc(cc: &eframe::CreationContext<'_>) {
     setup_fonts(ctx);
 
     //ctx.set_pixels_per_point(ctx.pixels_per_point() + UI_SCALE_FACTOR);
+    //ctx.set_pixels_per_point(1.0);
+    //
+    //
+    //ctx.tessellation_options_mut(|to| to.feathering = false);
 
     egui_extras::install_image_loaders(ctx);