fix(web): cap canvas via Window resize_constraints (the actual fix)

The previous attempts (#97/#98) capped a wrapper element's max-width and
relied on the canvas's width:100% resolving against it — but winit observes
and sizes the *canvas element itself* (via ResizeObserver on its content box),
so the wrapper cap never reached the surface and /play still panicked at
2560x1440 on a 4K@150% viewport.

Use the canonical mechanism instead: set the primary Window's
`resize_constraints { max_width: 2048, max_height: 2048 }`. On web, Bevy maps
this to winit `set_max_inner_size` → the canvas's own `max-width`/`max-height`
style, so the wgpu surface can never exceed wgpu's downlevel_webgl2
max_texture_dimension_2d (2048). play.html mirrors the same `max-*` directly on
#bevy-canvas (belt-and-suspenders) and centres the letterbox with margin:auto;
the obsolete wrapper + clamp script are removed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_web/src/lib.rs

@@ -13,7 +13,7 @@ use bevy::asset::AssetMetaCheck;
 use bevy::prelude::*;
 use bevy::render::RenderPlugin;
 use bevy::render::settings::{RenderCreation, WgpuSettings, WgpuSettingsPriority};
-use bevy::window::{Window, WindowPlugin, WindowResolution};
+use bevy::window::{Window, WindowPlugin, WindowResizeConstraints, WindowResolution};
 use solitaire_data::LocalOnlyProvider;
 use solitaire_engine::CoreGamePlugin;
 use wasm_bindgen::prelude::*;
@@ -42,6 +42,19 @@ pub fn start() {
                         // resize event and killing the WASM thread.
                         resolution: WindowResolution::default()
                             .with_scale_factor_override(1.0),
+                        // Cap the surface at WebGL2's max texture dimension (2048).
+                        // On wasm Bevy creates the device with
+                        // `Limits::downlevel_webgl2_defaults()` (max_texture_dimension_2d
+                        // = 2048), so a larger surface — e.g. a 4K display at 150% scale
+                        // gives a 2560x1440 logical viewport — makes Surface::configure
+                        // panic on the first frame. winit maps this constraint to the
+                        // canvas's `max-width`/`max-height` style, so the surface can
+                        // never exceed it. Viewports wider/taller than 2048 letterbox.
+                        resize_constraints: WindowResizeConstraints {
+                            max_width: 2048.0,
+                            max_height: 2048.0,
+                            ..default()
+                        },
                         ..default()
                     }),
                     ..default()