feat(app): Wayland support + monitor-relative default window size

Two related platform-fit fixes for desktop launch:

1. Wayland session compatibility. The workspace Cargo.toml's
   Bevy feature list previously enabled only `x11`, leaving
   winit-on-Wayland to fall through to XWayland — the game
   rendered inside an X11 frame stitched into the Wayland
   compositor instead of as a native Wayland client. Adding
   the `wayland` feature lets winit prefer Wayland when
   WAYLAND_DISPLAY is set on the session, falling back to X11
   when it isn't. Costs a few hundred KB of binary for the
   libwayland-client bindings; comment in Cargo.toml explains
   the trade.

2. Smart default window sizing. The fallback window size for
   first launches (no saved geometry) was a fixed 1280x800. On
   a 4K monitor that's a comparatively tiny window in one
   corner; the game's cards then occupy a small physical area
   even though the screen has plenty of room. New
   `apply_smart_default_window_size` Update system queries
   `Monitor` (with the `PrimaryMonitor` marker) and resizes the
   primary window to ~70% of the monitor's *logical* size on
   the first frame. Logical size already factors in the OS's
   HiDPI scale factor, so:

   - 1920x1080 / 1.0 scale → 1344x756 target
   - 2560x1440 / 1.0 scale → 1792x1008 target
   - 3840x2160 / 1.0 scale → 2688x1512 target
   - 2880x1800 / 2.0 scale (Retina) → 1008x630 target
                  (same physical size as 1080p)

   Clamped to the existing 800x600 minimum so old systems
   don't get sub-minimum windows. Skipped entirely when saved
   geometry was applied — the player's chosen size always
   wins. Uses `Local<bool>` for one-shot semantics; the early-
   exit per tick costs nothing once `*applied` is true.

Workspace: 1170 passing tests / 0 failing. cargo clippy
--workspace --all-targets -- -D warnings clean.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Cargo.toml

@@ -54,11 +54,16 @@ bevy = { version = "0.18", default-features = false, features = [
     "bevy_window",
     "custom_cursor",
     "reflect_auto_register",
-    # default_platform (desktop subset; no android/wayland/webgl/gilrs/sysinfo)
+    # default_platform (desktop subset; no android/webgl/gilrs/sysinfo)
     "std",
     "bevy_winit",
     "default_font",
     "multi_threaded",
+    # winit prefers Wayland when WAYLAND_DISPLAY is set on the
+    # session and falls through to X11 otherwise. Without `wayland`,
+    # winit-on-Wayland-session falls back to XWayland which renders
+    # the game in an X11 frame inside the Wayland compositor.
+    "wayland",
     "x11",
     # common_api
     "bevy_color",