keyboard/state: handle repeat rate 0, let widgets see Escape

- wl_keyboard.repeat_info with rate 0 means "no repeat"; we divided by it.
- an unknown keymap format hit unreachable!() instead of being ignored.
- raw keycode 1 (Escape) returned before widgets were dispatched, so the
  launcher's Escape handler (which saves the prompt for Ctrl+R) never ran.
  Dispatch first, then fall back to quitting.
- always lay out on the first layer-surface configure, even when the
  compositor hands us exactly the placeholder dimensions.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/state.rs

@@ -461,12 +461,15 @@ impl Dispatch<zwlr_layer_surface_v1::ZwlrLayerSurfaceV1, ()> for State {
                     (width, height) = (640, 480);
                 }
                 layer_surface.ack_configure(serial);
+                let first_configure = !state.configured;
                 state.configured = true;
                 state.dirty = true;
 
                 let dim = (width as i32, height as i32);
 
-                if state.configured && state.dimensions == dim {
+                // Always lay out on the first configure, even if the
+                // compositor happens to hand us our placeholder dimensions.
+                if !first_configure && state.dimensions == dim {
                     return;
                 }
                 state.bufmgr.clear_buffers();
@@ -656,17 +659,21 @@ impl Dispatch<wl_keyboard::WlKeyboard, ()> for State {
                 state: kbstate,
                 ..
             } => {
-                if key == 1 {
-                    state.running = false;
-                    return;
-                }
                 state.keyboard.resolve();
                 let k = state.keyboard.key(key, kbstate);
                 let repeats = k.repeats;
                 let ev = Event::KeyEvent(k);
+                // Widgets see the key first so the launcher gets to save its
+                // prompt on Escape (the early-return used to swallow it).
                 for widget in state.widgets.iter_mut() {
                     widget.event(&ev);
                 }
+                // Raw keycode 1 is KEY_ESC: fall back to quitting even when no
+                // keymap could be loaded and no widget handled it.
+                if key == 1 && kbstate == WEnum::Value(wl_keyboard::KeyState::Pressed) {
+                    state.running = false;
+                    return;
+                }
                 if repeats {
                     if let Event::KeyEvent(k) = ev {
                         state