fix(frontend): keep wgpu out of the WASM build

eframe 0.34.2 added `wgpu` to its `default` feature set (it was not a
default in 0.34.1, which the #580 cargo update bumped past). That pulled
wgpu-core into the wasm32-unknown-unknown build, where it fails to
compile (`cannot find value Vulkan in module hal::api`).

Disable eframe's default features at the workspace level and re-add the
features that previously came from `default`:
- native: wgpu, accesskit, wayland, x11
- wasm: web_screen_reader (glow comes from the workspace-level features)

Gate the `CreationContext::wgpu_render_state` access in info_page.rs
behind cfg(not(wasm32)); that field only exists with the wgpu feature,
so WASM now falls through to the glow/WebGL branch.

Cargo.lock drops the Wayland/Adwaita client-side-decoration chain
(sctk-adwaita, tiny-skia, ttf-parser, ...) that only came in via
winit/default.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: srperens

Cargo.lock

@@ -51,7 +51,11 @@ garde = { version = "0.23", features = ["derive"] }
 # Frontend
 egui = "0.34"
 egui-phosphor = "0.12"
-eframe = { version = "0.34", features = ["default_fonts", "persistence", "glow"] }
+# default-features disabled: eframe 0.34's `default` set includes `wgpu`, which
+# would otherwise be pulled into the WASM build where wgpu fails to compile.
+# Native-only renderer/platform features (wgpu, accesskit, wayland, x11) are
+# re-added on the non-wasm target in frontend/Cargo.toml.
+eframe = { version = "0.34", default-features = false, features = ["default_fonts", "persistence", "glow"] }
 egui_extras = { version = "0.34", features = ["image"] }
 egui_plot = "0.35"
 reqwest = { version = "0.13", default-features = false, features = ["json", "rustls"] }

Cargo.toml

@@ -45,6 +45,10 @@ base64 = "0.22"
 
 # WASM-specific dependencies
 [target.'cfg(target_arch = "wasm32")'.dependencies]
+# web_screen_reader (screen-reader accessibility) was part of eframe's `default`
+# set, which is disabled at the workspace level; re-add it for WASM. glow renderer
+# comes from the workspace-level features.
+eframe = { workspace = true, features = ["web_screen_reader"] }
 # Cross-platform time - needs wasm-bindgen feature for WASM
 instant = { version = "0.1", features = ["wasm-bindgen"] }
 gloo-net.workspace = true
@@ -60,8 +64,10 @@ wasm-bindgen = "0.2"
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 # System hostname detection (for generating external URLs)
 hostname = "0.4"
-# Enable wgpu renderer for native (macOS Metal support) - not available for WASM
-eframe = { workspace = true, features = ["wgpu"] }
+# Enable wgpu renderer for native (macOS Metal support) - not available for WASM.
+# accesskit/wayland/x11 were part of eframe's `default` set, which is disabled at
+# the workspace level to keep wgpu out of the WASM build; re-add them here.
+eframe = { workspace = true, features = ["wgpu", "accesskit", "wayland", "x11"] }
 # Cross-platform time (standard for native)
 instant = "0.1"
 tokio = { workspace = true, features = ["rt-multi-thread", "macros", "sync"] }

frontend/Cargo.toml

@@ -20,7 +20,10 @@ pub struct RendererInfo {
 /// Detect the active rendering backend from eframe's CreationContext.
 /// Checks which renderer is actually active at runtime.
 pub fn detect_renderer(cc: &eframe::CreationContext<'_>) -> RendererInfo {
-    // wgpu renderer detection
+    // wgpu renderer detection. The `wgpu_render_state` field only exists when
+    // eframe is built with the `wgpu` feature, which we enable on native only
+    // (WASM uses glow/WebGL), so this block must be gated to native targets.
+    #[cfg(not(target_arch = "wasm32"))]
     if let Some(render_state) = &cc.wgpu_render_state {
         let info = render_state.adapter.get_info();
         let mut details = vec![