feat(ie-shell): add CLI argument parsing and headless mode #6

Add clap-based CLI with --headless, --url, --dump-source, --dump-status,
and --allow-http flags. Split main.rs into app.rs (GUI browser),
cli.rs (argument parsing), and headless.rs (headless execution path).
Remove Phase 2 crate dependencies from ie-shell for faster builds.
11 CLI unit tests + 2 smoke integration tests.

Author: thomasnemer

Cargo.lock

@@ -50,4 +50,5 @@ rustls = "0.23"
 url = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+clap = { version = "4", features = ["derive"] }
 bytes = "1"

Cargo.toml

@@ -15,11 +15,7 @@ tracing-subscriber.workspace = true
 tokio.workspace = true
 winit.workspace = true
 url.workspace = true
+clap.workspace = true
 ie-net.workspace = true
-ie-html.workspace = true
-ie-css.workspace = true
 ie-dom.workspace = true
-ie-js.workspace = true
-ie-layout.workspace = true
-ie-render.workspace = true
 ie-sandbox.workspace = true

crates/ie-shell/Cargo.toml

@@ -0,0 +1,53 @@
+use url::Url;
+use winit::application::ApplicationHandler;
+use winit::event::WindowEvent;
+use winit::event_loop::ActiveEventLoop;
+use winit::window::{Window, WindowId};
+
+pub struct Browser {
+    window: Option<Window>,
+    _url: Option<Url>,
+}
+
+impl Browser {
+    pub fn new(url: Option<Url>) -> Self {
+        Self {
+            window: None,
+            _url: url,
+        }
+    }
+}
+
+impl ApplicationHandler for Browser {
+    fn resumed(&mut self, event_loop: &ActiveEventLoop) {
+        if self.window.is_none() {
+            let attrs = Window::default_attributes()
+                .with_title("Internet Exploder")
+                .with_maximized(true);
+            match event_loop.create_window(attrs) {
+                Ok(window) => self.window = Some(window),
+                Err(e) => {
+                    tracing::error!("failed to create window: {e}");
+                    event_loop.exit();
+                }
+            }
+        }
+    }
+
+    fn window_event(
+        &mut self,
+        event_loop: &ActiveEventLoop,
+        _window_id: WindowId,
+        event: WindowEvent,
+    ) {
+        match event {
+            WindowEvent::CloseRequested => {
+                event_loop.exit();
+            }
+            WindowEvent::RedrawRequested => {
+                // TODO: render current page
+            }
+            _ => {}
+        }
+    }
+}