feat: Text rendering

Cargo.toml

@@ -19,3 +19,4 @@ notify = "8.0.0"
 taffy = { version = "0.7.7", features = ["serde"]}
 slotmap = "1.0.7"
 color = "0.3.1"
+cosmic-text = "0.13.0"

src/app.rs

@@ -59,6 +59,19 @@ impl<'window> ApplicationHandler<CustomEvent> for App<'window> {
 
                             gui.compute_layout(size.width, size.height);
                             gpu.update_instance_buffer(gui.into_instances());
+
+                            // Collect and render text instances
+                            let text_items = gui.collect_text_instances();
+                            println!("GuiUpdate: collected {} text items", text_items.len());
+                            let mut all_text_instances = Vec::new();
+
+                            for (text, x, y, font_size, color, max_width) in text_items {
+                                let text_instances = gpu.render_text(&text, x, y, font_size, color, Some(max_width));
+                                all_text_instances.extend(text_instances);
+                            }
+
+                            println!("GuiUpdate: updating GPU with {} text instances", all_text_instances.len());
+                            gpu.update_text_instances(&all_text_instances);
 
                             window.request_redraw();
                         }
@@ -78,11 +91,43 @@ impl<'window> ApplicationHandler<CustomEvent> for App<'window> {
                     if let Ok(mut gui) = self.gui.lock() {
                         gui.compute_layout(size.width, size.height);
                         gpu.update_instance_buffer(gui.into_instances());
+
+                        // Collect and render text instances
+                        let text_items = gui.collect_text_instances();
+                        println!("Resized: collected {} text items", text_items.len());
+                        let mut all_text_instances = Vec::new();
+
+                        for (text, x, y, font_size, color, max_width) in text_items {
+                            let text_instances = gpu.render_text(&text, x, y, font_size, color, Some(max_width));
+                            all_text_instances.extend(text_instances);
+                        }
+
+                        println!("Resized: updating GPU with {} text instances", all_text_instances.len());
+                        gpu.update_text_instances(&all_text_instances);
 
                         gpu.set_size(size.width, size.height);
                     }
                 }
             }
+            WindowEvent::ScaleFactorChanged { scale_factor, .. } => {
+                if let Some(gpu) = self.gpu.as_mut() {
+                    println!("Scale factor changed to: {}", scale_factor);
+                    gpu.update_scale_factor(scale_factor);
+
+                    // Re-render text with new scale factor
+                    if let Ok(gui) = self.gui.lock() {
+                        let text_items = gui.collect_text_instances();
+                        let mut all_text_instances = Vec::new();
+
+                        for (text, x, y, font_size, color, max_width) in text_items {
+                            let text_instances = gpu.render_text(&text, x, y, font_size, color, Some(max_width));
+                            all_text_instances.extend(text_instances);
+                        }
+
+                        gpu.update_text_instances(&all_text_instances);
+                    }
+                }
+            }
             WindowEvent::RedrawRequested => {
                 if let Some(gpu) = self.gpu.as_mut() {
                     gpu.draw();