feat(ci): build styled macOS DMG headlessly via dmgbuild (#189)

- Add scripts/build-dmg.py using dmgbuild to generate DMGs with custom background art and icon locations without Finder AppleScript.
- Update .gitea/workflows/build-macos.yml and .github/workflows/build-macos.yml to package the .app bundle using dmgbuild in a headless virtual environment.
- Resolves missing DMG background in CI while preventing AppleScript GUI automation timeouts.

.gitea/workflows/build-macos.yml

@@ -94,11 +94,22 @@ jobs:
         run: |
           mkdir -p release-assets
           
-          # Stage DMG package
+          APP_PATH=$(find src-tauri/target -type d -path "*/release/bundle/macos/*.app" | head -n 1)
-          DMG_FILE=$(find src-tauri/target -type f -path "*/release/bundle/dmg/*.dmg" | head -n 1)
+          if [ -z "$APP_PATH" ] || [ ! -d "$APP_PATH" ]; then
-          if [ -n "$DMG_FILE" ] && [ -f "$DMG_FILE" ]; then
+            echo "Error: Could not locate built .app bundle in src-tauri/target"
-            cp "$DMG_FILE" "release-assets/${PREFIX}.dmg"
+            exit 1
           fi
+          echo "Found .app bundle: ${APP_PATH}"
+
+          # Setup isolated Python virtual environment for dmgbuild
+          python3 -m venv "${{ runner.temp }}/dmgbuild-venv"
+          "${{ runner.temp }}/dmgbuild-venv/bin/pip" install --quiet dmgbuild
+
+          # Build styled DMG with background art and custom icon locations
+          "${{ runner.temp }}/dmgbuild-venv/bin/python" scripts/build-dmg.py \
+            --app "${APP_PATH}" \
+            --output "release-assets/${PREFIX}.dmg" \
+            --volname "ICCery"
 
 
       - name: Upload Artifacts

.github/workflows/build-macos.yml

@@ -84,22 +84,9 @@ jobs:
           echo "SHORT_SHA=${SHORT_SHA}" >> $GITHUB_ENV
           echo "PREFIX=ICCery_${TAG}-${SHORT_SHA}-macos-${{ matrix.platform.arch }}" >> $GITHUB_ENV
 
-      - name: Warm up macOS GUI for DMG layout
-        if: runner.os == 'macOS'
-        run: |
-          # Tauri's DMG bundler runs an AppleScript that asks Finder to set the
-          # background picture and icon positions. On CI runners, Finder or the
-          # Aqua session may be idle, which can cause AppleEvent timeouts. Try to
-          # start/awaken Finder and System Events before the real build.
-          open -g -a Finder || true
-          open -g -a "System Events" || true
-          # Send a harmless probe to force Finder to initialise a scripting session.
-          osascript -e 'tell application "Finder" to get name' || true
-          sleep 10
-
       - name: Build Tauri App
         env:
-          TAURI_BUNDLER_DMG_IGNORE_CI: "true"
+          CI: "true"
         run: npm run tauri build -- --target ${{ matrix.platform.target }}
 
       - name: Prepare Release Assets
@@ -107,11 +94,22 @@ jobs:
         run: |
           mkdir -p release-assets
           
-          # Stage DMG package
+          APP_PATH=$(find src-tauri/target -type d -path "*/release/bundle/macos/*.app" | head -n 1)
-          DMG_FILE=$(find src-tauri/target -type f -path "*/release/bundle/dmg/*.dmg" | head -n 1)
+          if [ -z "$APP_PATH" ] || [ ! -d "$APP_PATH" ]; then
-          if [ -n "$DMG_FILE" ] && [ -f "$DMG_FILE" ]; then
+            echo "Error: Could not locate built .app bundle in src-tauri/target"
-            cp "$DMG_FILE" "release-assets/${PREFIX}.dmg"
+            exit 1
           fi
+          echo "Found .app bundle: ${APP_PATH}"
+
+          # Setup isolated Python virtual environment for dmgbuild
+          python3 -m venv "${{ runner.temp }}/dmgbuild-venv"
+          "${{ runner.temp }}/dmgbuild-venv/bin/pip" install --quiet dmgbuild
+
+          # Build styled DMG with background art and custom icon locations
+          "${{ runner.temp }}/dmgbuild-venv/bin/python" scripts/build-dmg.py \
+            --app "${APP_PATH}" \
+            --output "release-assets/${PREFIX}.dmg" \
+            --volname "ICCery"
 
 
       - name: Upload Artifacts

AGENTS.md

@@ -10,9 +10,6 @@
 ## 3D Gamut Viewer
 
 - The viewer renders the measured/derived `.gam` volume and an optional sRGB reference wireframe in CIELAB.
-- **Do not** create `THREE.WebGLRenderer` during `DOMContentLoaded`. Call `ensureGamutViewer()` from `state.js` only when Stage 5 becomes visible. Eager WebGL on a hidden canvas respawns WKWebView on macOS Monterey Intel (#225).
-- Feature-detect WebGL first; missing/lost context must leave a fallback message in `#gamutViewerContainer` and must not take down the app.
-- Pause the rAF loop when leaving Stage 5 (`pauseGamutViewer`).
 - Layer controls (profile, sRGB, axes) each have visibility toggles and opacity sliders.
 - Click **Reset View** or press **R** to return the camera to its default position.
 - Full JSDoc is provided on the public API in `src/js/gamut_viewer.js`.

README.md

@@ -88,7 +88,7 @@ flowchart TD
 - [Node.js](https://nodejs.org/) (v18 or newer)
 - [Rust](https://www.rust-lang.org/) (1.78+ stable)
 - Operating system dependencies:
-  - **macOS**: macOS 12.0 (Monterey) or newer, Xcode Command Line Tools (`xcode-select --install`).
+  - **macOS**: macOS 11.0 (Big Sur) or newer, Xcode Command Line Tools (`xcode-select --install`).
   - **Windows**: Microsoft Visual Studio C++ Build Tools & WebView2 runtime.
   - **Linux (Debian/Ubuntu)**: `libwebkit2gtk-4.1-dev`, `build-essential`, `curl`, `wget`, `file`, `libxdo-dev`, `libssl-dev`, `libayatana-appindicator3-dev`, `librsvg2-dev`, `libcups2-dev`.
 
@@ -127,40 +127,6 @@ npm run tauri build
 
 ---
 
-## Platform support
-
-### macOS
-
-The packaged app declares `LSMinimumSystemVersion = 12.0`. Installers refuse Catalina and Big Sur rather than launching into a WKWebView crash loop.
-
-| macOS | Status |
-|---|---|
-| 13+ (Ventura and newer), Apple Silicon | Supported |
-| 13+, Intel | Supported |
-| 12.7.x Monterey, Apple Silicon | Supported, WebGL best-effort |
-| 12.0–12.6 Monterey, Intel | Best-effort; WebGL is deferred until Stage 5; known WKWebView GPU process crashes |
-| 11 Big Sur | Not supported (installer refuses) |
-| 10.15 Catalina | Not supported |
-
-The 3D gamut viewer (Stage 5) creates a WebGL context only when that stage is shown. Stages 1–4 remain usable if WebGL is missing or the GPU process is lost.
-
-### macOS troubleshooting
-
-If the window flashes white and disappears, this is almost always the WKWebView **Web Content** or **GPU** helper dying — Apple Crash Reporter will not attach to `ICCery.app`.
-
-- Launch from Terminal to see `web content process terminated`:
-  ```text
-  /Applications/ICCery.app/Contents/MacOS/ICCery
-  ```
-- Check `~/Library/Logs/DiagnosticReports` for `com.apple.WebKit.WebContent` or `com.apple.WebKit.GPU`.
-- ICCery log file (rotated, last 5 segments kept):
-  ```text
-  ~/Library/Logs/com.gronod.iccery/iccery.log
-  ```
-- Custom ColorSync display profiles can crash toolkit UIs on Monterey. Testing with the default display profile (or Safe Mode) is a valid support question.
-
----
-
 ## Licence
 
 The ICCery GUI application is proprietary software licensed under the terms of the [EULA](LICENCE.md). ArgyllCMS binaries and source code are licensed under the GNU Affero General Public License (AGPLv3).

ROADMAP.md

@@ -116,7 +116,6 @@ ICCery is a native, cross-platform desktop application built with:
 ### Maintenance & Reliability Release (`v0.8.4`)
 - [x] **Atomic Verification History Persistence (#213)**: Hardened `quality_store.rs` with atomic temporary file writes (`.tmp`), explicit flush/sync, and atomic rename to prevent historical drift data loss or corruption upon unexpected system crashes.
 - [x] **Frontend Unit Testing & CI Integration (#215)**: Added standard `npm test` script executing the 3 frontend test suites (`profcheck`, `chartread`, and `gamut_viewer`) and integrated automated frontend test validation into macOS, Linux, and Windows CI workflows.
-- [x] **macOS Monterey WKWebView survival (#225)**: Deferred Stage 5 WebGL until the gamut viewer is shown, hid the main window until first paint, painted a dark WKWebView backing, logged Web Content termination, and raised `minimumSystemVersion` to 12.0.
 
 ---
 

scripts/build-dmg.py

@@ -0,0 +1,146 @@
+#!/usr/bin/env python3
+"""
+Headless macOS DMG Builder for ICCery.
+
+Uses `dmgbuild` to package the .app bundle into a styled DMG with custom
+background art, window bounds, and icon locations without requiring Finder
+AppleScript automation or an interactive display session.
+"""
+
+import argparse
+import os
+import sys
+
+def parse_args():
+    parser = argparse.ArgumentParser(description="Build styled macOS DMG installer")
+    parser.add_argument(
+        "--app",
+        required=True,
+        help="Path to the .app application bundle",
+    )
+    parser.add_argument(
+        "--output",
+        required=True,
+        help="Path to the output .dmg file",
+    )
+    parser.add_argument(
+        "--volname",
+        default="ICCery",
+        help="Volume name for the mounted disk image (default: ICCery)",
+    )
+    parser.add_argument(
+        "--background",
+        default="src-tauri/icons/dmg-background.png",
+        help="Path to background image (default: src-tauri/icons/dmg-background.png)",
+    )
+    parser.add_argument(
+        "--icon",
+        default="src-tauri/icons/icon.icns",
+        help="Path to volume icon .icns (default: src-tauri/icons/icon.icns)",
+    )
+    parser.add_argument(
+        "--window-size",
+        nargs=2,
+        type=int,
+        default=[660, 400],
+        metavar=("WIDTH", "HEIGHT"),
+        help="Window width and height in points (default: 660 400)",
+    )
+    parser.add_argument(
+        "--icon-size",
+        type=int,
+        default=100,
+        help="Icon size in points (default: 100)",
+    )
+    parser.add_argument(
+        "--app-pos",
+        nargs=2,
+        type=int,
+        default=[180, 220],
+        metavar=("X", "Y"),
+        help="App icon location (default: 180 220)",
+    )
+    parser.add_argument(
+        "--apps-link-pos",
+        nargs=2,
+        type=int,
+        default=[480, 220],
+        metavar=("X", "Y"),
+        help="Applications symlink location (default: 480 220)",
+    )
+    return parser.parse_args()
+
+
+def main():
+    args = parse_args()
+
+    app_path = os.path.abspath(args.app)
+    output_path = os.path.abspath(args.output)
+    bg_path = os.path.abspath(args.background) if args.background else None
+    icon_path = os.path.abspath(args.icon) if args.icon else None
+
+    if not os.path.isdir(app_path):
+        print(f"Error: Application bundle does not exist at '{app_path}'", file=sys.stderr)
+        sys.exit(1)
+
+    if bg_path and not os.path.isfile(bg_path):
+        print(f"Error: Background image not found at '{bg_path}'", file=sys.stderr)
+        sys.exit(1)
+
+    try:
+        import dmgbuild
+    except ImportError:
+        print("Error: 'dmgbuild' is required. Install via: pip install dmgbuild", file=sys.stderr)
+        sys.exit(1)
+
+    app_name = os.path.basename(app_path)
+    output_dir = os.path.dirname(output_path)
+    if output_dir:
+        os.makedirs(output_dir, exist_ok=True)
+
+    if os.path.exists(output_path):
+        os.remove(output_path)
+
+    win_w, win_h = args.window_size
+    app_x, app_y = args.app_pos
+    apps_x, apps_y = args.apps_link_pos
+
+    settings = {
+        "files": [app_path],
+        "symlinks": {"Applications": "/Applications"},
+        "background": bg_path,
+        "icon": icon_path if icon_path and os.path.isfile(icon_path) else None,
+        "icon_size": args.icon_size,
+        "window_rect": ((100, 100), (win_w, win_h)),
+        "icon_locations": {
+            app_name: (app_x, app_y),
+            "Applications": (apps_x, apps_y),
+        },
+        "format": "UDZO",
+    }
+
+    print(f"Building DMG for {app_name}...")
+    print(f"  Volume Name:   {args.volname}")
+    print(f"  App Bundle:    {app_path}")
+    print(f"  Background:    {bg_path}")
+    print(f"  Window Size:   {win_w}x{win_h}")
+    print(f"  App Position:  ({app_x}, {app_y})")
+    print(f"  Apps Position: ({apps_x}, {apps_y})")
+    print(f"  Output Path:   {output_path}")
+
+    try:
+        dmgbuild.build_dmg(output_path, args.volname, settings=settings)
+    except Exception as e:
+        print(f"Error: dmgbuild failed: {e}", file=sys.stderr)
+        sys.exit(1)
+
+    if not os.path.isfile(output_path):
+        print(f"Error: Expected output DMG file '{output_path}' was not created", file=sys.stderr)
+        sys.exit(1)
+
+    size_mb = os.path.getsize(output_path) / (1024 * 1024)
+    print(f"Successfully generated DMG ({size_mb:.2f} MB): {output_path}")
+
+
+if __name__ == "__main__":
+    main()

src-tauri/src/commands.rs

@@ -105,101 +105,20 @@ pub async fn resolve_binary(app: AppHandle, binary_name: String) -> Result<Strin
     Ok(resource_path.to_string_lossy().to_string())
 }
 
-#[derive(Serialize, Clone, Debug, PartialEq, Eq)]
-pub struct OsInfo {
-    pub os: String,
-    pub arch: String,
-    pub family: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub macos_major: Option<u32>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub macos_minor: Option<u32>,
-}
-
-/// Parse `sw_vers -productVersion` output such as `"12.7.6"` or `"13.0"`.
-pub fn parse_macos_product_version(version: &str) -> Option<(u32, u32, u32)> {
-    let mut parts = version.trim().split('.');
-    let major = parts.next()?.parse().ok()?;
-    let minor = parts.next().unwrap_or("0").parse().unwrap_or(0);
-    let patch = parts.next().unwrap_or("0").parse().unwrap_or(0);
-    Some((major, minor, patch))
-}
-
-fn macos_version_from_sw_vers() -> Option<(u32, u32, u32)> {
-    #[cfg(target_os = "macos")]
-    {
-        let output = std::process::Command::new("sw_vers")
-            .arg("-productVersion")
-            .output()
-            .ok()?;
-        if !output.status.success() {
-            return None;
-        }
-        parse_macos_product_version(&String::from_utf8_lossy(&output.stdout))
-    }
-    #[cfg(not(target_os = "macos"))]
-    {
-        None
-    }
-}
-
-pub fn collect_os_info() -> OsInfo {
-    let (macos_major, macos_minor) = match macos_version_from_sw_vers() {
-        Some((maj, min, _)) => (Some(maj), Some(min)),
-        None => (None, None),
-    };
-    OsInfo {
-        os: std::env::consts::OS.to_string(),
-        arch: std::env::consts::ARCH.to_string(),
-        family: std::env::consts::FAMILY.to_string(),
-        macos_major,
-        macos_minor,
-    }
-}
-
 #[derive(Serialize)]
 pub struct AppInfo {
     pub version: String,
     pub build_date: String,
-    pub os: String,
-    pub arch: String,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub macos_major: Option<u32>,
-    #[serde(skip_serializing_if = "Option::is_none")]
-    pub macos_minor: Option<u32>,
-}
-
-#[tauri::command]
-pub fn get_os_info() -> OsInfo {
-    collect_os_info()
 }
 
 #[tauri::command]
 pub fn get_app_info() -> AppInfo {
-    let os = collect_os_info();
     AppInfo {
         version: env!("CARGO_PKG_VERSION").to_string(),
         build_date: env!("BUILD_DATE").to_string(),
-        os: os.os,
-        arch: os.arch,
-        macos_major: os.macos_major,
-        macos_minor: os.macos_minor,
     }
 }
 
-#[tauri::command]
-pub fn show_main_window(app: AppHandle) -> Result<(), String> {
-    if let Some(win) = app.get_webview_window("main") {
-        crate::macos_webview::paint_dark_webview(&win);
-        win.show().map_err(|e| e.to_string())?;
-        let _ = win.set_focus();
-        log::info!("Main window shown after frontend ready");
-    } else {
-        log::warn!("show_main_window: window 'main' not found");
-    }
-    Ok(())
-}
-
 pub fn resolve_safe_cwd(app: &AppHandle, cwd_input: &str) -> Result<String, String> {
     if !cwd_input.trim().is_empty() {
         let p = std::path::Path::new(cwd_input.trim());
@@ -2177,33 +2096,4 @@ mod tests {
 
         let _ = std::fs::remove_dir_all(&temp_dir);
     }
-
-    #[test]
-    fn test_parse_macos_product_version() {
-        assert_eq!(parse_macos_product_version("12.7.6"), Some((12, 7, 6)));
-        assert_eq!(parse_macos_product_version("13.0"), Some((13, 0, 0)));
-        assert_eq!(parse_macos_product_version(" 15.1.1\n"), Some((15, 1, 1)));
-        assert_eq!(parse_macos_product_version(""), None);
-        assert_eq!(parse_macos_product_version("ventura"), None);
-    }
-
-    #[test]
-    fn test_collect_os_info_has_host_os_and_arch() {
-        let info = collect_os_info();
-        assert_eq!(info.os, std::env::consts::OS);
-        assert_eq!(info.arch, std::env::consts::ARCH);
-        assert_eq!(info.family, std::env::consts::FAMILY);
-        if info.os != "macos" {
-            assert_eq!(info.macos_major, None);
-            assert_eq!(info.macos_minor, None);
-        }
-    }
-
-    #[test]
-    fn test_get_app_info_includes_os_arch() {
-        let info = get_app_info();
-        assert!(!info.version.is_empty());
-        assert_eq!(info.os, std::env::consts::OS);
-        assert_eq!(info.arch, std::env::consts::ARCH);
-    }
 }

src-tauri/src/lib.rs

@@ -3,12 +3,10 @@ use tauri::Manager;
 mod cgats;
 mod commands;
 mod events;
-mod macos_webview;
 mod print;
 mod process_manager;
 mod quality_store;
 mod settings;
-mod window_lifecycle;
 
 #[cfg_attr(mobile, tauri::mobile_entry_point)]
 pub fn run() {
@@ -23,10 +21,6 @@ pub fn run() {
                     tauri_plugin_log::Target::new(tauri_plugin_log::TargetKind::Stdout),
                     tauri_plugin_log::Target::new(tauri_plugin_log::TargetKind::Webview),
                 ])
-                // wry / tauri_runtime_wry log "web content process terminated" at info/debug.
-                // Surface those lines in iccery.log so Monterey GPU deaths are diagnosable.
-                .level_for("wry", log::LevelFilter::Info)
-                .level_for("tauri_runtime_wry", log::LevelFilter::Info)
                 .max_file_size(5 * 1024 * 1024)
                 .rotation_strategy(tauri_plugin_log::RotationStrategy::KeepAll)
                 .build(),
@@ -39,12 +33,6 @@ pub fn run() {
             let filter = settings::parse_log_level_filter(settings.log_level.as_deref());
             log::set_max_level(filter);
             log::info!("ICCery initialized. Effective log level: {:?}", filter);
-
-            if let Some(win) = app.get_webview_window("main") {
-                // Dark backing before first paint. Do not show() here — that races
-                // the still-white WKWebView. Frontend invokes show_main_window.
-                macos_webview::paint_dark_webview(&win);
-            }
             Ok(())
         })
         .manage(process_manager::ProcessManager::new())
@@ -52,8 +40,6 @@ pub fn run() {
         .invoke_handler(tauri::generate_handler![
             commands::spawn_process,
             commands::get_app_info,
-            commands::get_os_info,
-            commands::show_main_window,
             commands::get_default_working_dir,
             commands::get_log_path,
             commands::get_recent_log_excerpt,
@@ -109,35 +95,21 @@ pub fn run() {
         .run(|app_handle, event| {
             match event {
                 tauri::RunEvent::Exit | tauri::RunEvent::ExitRequested { .. } => {
-                    window_lifecycle::mark_user_close_requested();
                     let pm = app_handle.state::<process_manager::ProcessManager>();
                     tauri::async_runtime::block_on(async {
                         pm.kill_all().await;
                     });
                 }
-                tauri::RunEvent::WindowEvent { label, event, .. } => {
+                tauri::RunEvent::WindowEvent {
-                    match event {
+                    event: tauri::WindowEvent::CloseRequested { .. },
-                        tauri::WindowEvent::Destroyed => {
+                    ..
-                            window_lifecycle::on_window_destroyed(&label);
+                } => {
-                        }
+                    let pm = app_handle.state::<process_manager::ProcessManager>();
-                        tauri::WindowEvent::CloseRequested { .. } => {
+                    tauri::async_runtime::block_on(async {
-                            window_lifecycle::mark_user_close_requested();
+                        pm.kill_all().await;
-                            let pm = app_handle.state::<process_manager::ProcessManager>();
+                    });
-                            tauri::async_runtime::block_on(async {
-                                pm.kill_all().await;
-                            });
-                        }
-                        other => {
-                            log::debug!("WindowEvent on {label}: {other:?}");
-                        }
-                    }
-                }
-                other => {
-                    let text = format!("{other:?}");
-                    if window_lifecycle::is_web_content_termination_event(&text) {
-                        log::error!("WebView lifecycle event: {text}");
-                    }
                 }
+                _ => {}
             }
         });
 }

src-tauri/src/macos_webview.rs

@@ -1,84 +0,0 @@
-//! Dark native window + WKWebView backing for macOS (#225).
-//!
-//! `backgroundColor` in `tauri.conf.json` paints the NSWindow, but WKWebView
-//! still composites an opaque white layer until `drawsBackground` is disabled
-//! and (on macOS 12+) `underPageBackgroundColor` is set. We do **not** set
-//! `transparent: true` — that changes hit-testing and titlebar compositing.
-
-/// Theme fallback already used in `index.html` (`var(--bg-card, #1a1a22)`).
-pub const DARK_BG_U8: (u8, u8, u8, u8) = (0x1A, 0x1A, 0x22, 0xFF);
-
-pub fn paint_dark_webview(window: &tauri::WebviewWindow) {
-    let (r, g, b, a) = DARK_BG_U8;
-    let _ = window.set_background_color(Some(tauri::window::Color(r, g, b, a)));
-
-    #[cfg(target_os = "macos")]
-    {
-        let _ = window.with_webview(|webview| unsafe {
-            apply_native_dark_backing(&webview);
-        });
-    }
-}
-
-#[cfg(target_os = "macos")]
-unsafe fn apply_native_dark_backing(webview: &tauri::webview::PlatformWebview) {
-    use objc2::runtime::{AnyClass, AnyObject};
-    use objc2::{msg_send, sel};
-    use objc2_foundation::ns_string;
-
-    let red = 26.0f64 / 255.0;
-    let green = 26.0f64 / 255.0;
-    let blue = 34.0f64 / 255.0;
-    let alpha = 1.0f64;
-
-    let Some(nscolor_cls) = AnyClass::get(c"NSColor") else {
-        log::warn!("NSColor class missing; skipping dark window backing");
-        return;
-    };
-
-    let color: *mut AnyObject = msg_send![
-        nscolor_cls,
-        colorWithSRGBRed: red,
-        green: green,
-        blue: blue,
-        alpha: alpha
-    ];
-
-    let ns_window = webview.ns_window() as *mut AnyObject;
-    if !ns_window.is_null() && !color.is_null() {
-        let _: () = msg_send![ns_window, setBackgroundColor: color];
-    }
-
-    let wk = webview.inner() as *mut AnyObject;
-    if wk.is_null() {
-        log::warn!("WKWebView inner handle is null; cannot disable white backing");
-        return;
-    }
-
-    // Private KVC key wry uses for transparency / backgroundColor on macOS.
-    if let Some(nsnumber_cls) = AnyClass::get(c"NSNumber") {
-        let no: *mut AnyObject = msg_send![nsnumber_cls, numberWithBool: false];
-        if !no.is_null() {
-            let _: () = msg_send![wk, setValue: no, forKey: ns_string!("drawsBackground")];
-        }
-    }
-
-    // Public API on macOS 12+: covers overscroll / unpainted page.
-    let setter = sel!(setUnderPageBackgroundColor:);
-    let responds: bool = msg_send![wk, respondsToSelector: setter];
-    if responds && !color.is_null() {
-        let _: () = msg_send![wk, setUnderPageBackgroundColor: color];
-    }
-
-    log::info!("Applied dark WKWebView backing (#1A1A22)");
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn dark_bg_matches_theme_hex() {
-        assert_eq!(DARK_BG_U8, (26, 26, 34, 255));
-    }
-}

src-tauri/src/window_lifecycle.rs

@@ -1,88 +0,0 @@
-//! Window / webview lifecycle helpers for #225.
-//!
-//! Helper-process death (WKWebView Web Content / GPU) does not produce an
-//! ICCery Crash Reporter dialog. We log unexpected window destruction so the
-//! rotating `iccery.log` still has a timestamped breadcrumb.
-
-use std::sync::atomic::{AtomicBool, Ordering};
-
-static USER_CLOSE_REQUESTED: AtomicBool = AtomicBool::new(false);
-
-pub fn mark_user_close_requested() {
-    USER_CLOSE_REQUESTED.store(true, Ordering::SeqCst);
-}
-
-pub fn was_user_close_requested() -> bool {
-    USER_CLOSE_REQUESTED.load(Ordering::SeqCst)
-}
-
-pub fn describe_window_destroyed(label: &str, user_close: bool) -> String {
-    if user_close {
-        format!("Window destroyed after close request: {label}")
-    } else {
-        format!(
-            "Window destroyed unexpectedly: {label} (possible Web Content / GPU process death)"
-        )
-    }
-}
-
-pub fn on_window_destroyed(label: &str) {
-    let user_close = was_user_close_requested();
-    let msg = describe_window_destroyed(label, user_close);
-    if user_close {
-        log::info!("{msg}");
-    } else {
-        log::error!("{msg}");
-    }
-}
-
-/// True when a `RunEvent` debug string looks like WKWebView / wry helper death.
-pub fn is_web_content_termination_event(debug_text: &str) -> bool {
-    let lower = debug_text.to_ascii_lowercase();
-    lower.contains("web content process terminated")
-        || lower.contains("webcontentprocessdidterminate")
-        || (lower.contains("webview") && lower.contains("terminat"))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn expected_close_message() {
-        let msg = describe_window_destroyed("main", true);
-        assert!(msg.contains("main"));
-        assert!(msg.contains("close request"));
-        assert!(!msg.contains("unexpectedly"));
-    }
-
-    #[test]
-    fn unexpected_destroy_message() {
-        let msg = describe_window_destroyed("main", false);
-        assert!(msg.contains("main"));
-        assert!(msg.contains("unexpectedly"));
-        assert!(msg.contains("Web Content"));
-    }
-
-    #[test]
-    fn detects_wry_web_content_line() {
-        assert!(is_web_content_termination_event(
-            "web content process terminated"
-        ));
-        assert!(is_web_content_termination_event(
-            "WKWebView WebContentProcessDidTerminate"
-        ));
-        assert!(!is_web_content_termination_event("Main window shown"));
-        assert!(!is_web_content_termination_event("Ready"));
-    }
-
-    #[test]
-    fn close_flag_roundtrip() {
-        // Reset in case another test ran first in this process.
-        USER_CLOSE_REQUESTED.store(false, Ordering::SeqCst);
-        assert!(!was_user_close_requested());
-        mark_user_close_requested();
-        assert!(was_user_close_requested());
-        USER_CLOSE_REQUESTED.store(false, Ordering::SeqCst);
-    }
-}

src-tauri/tauri.conf.json

@@ -10,14 +10,11 @@
     "withGlobalTauri": true,
     "windows": [
       {
-        "label": "main",
         "title": "ICCery",
         "width": 1280,
         "height": 800,
         "minWidth": 1100,
-        "minHeight": 700,
+        "minHeight": 700
-        "visible": false,
-        "backgroundColor": "#1A1A22"
       }
     ],
     "security": {
@@ -39,7 +36,7 @@
       "argyll/**/*"
     ],
     "macOS": {
-      "minimumSystemVersion": "12.0",
+      "minimumSystemVersion": "10.15",
       "dmg": {
         "background": "icons/dmg-background.png",
         "windowSize": {

src/js/app.js

@@ -4,7 +4,7 @@ import { initChartread } from './chartread.js';
 import { initColprof } from './colprof.js';
 import { initProfcheck } from './profcheck.js';
 import { initSettings } from './settings.js';
-import { setGpuHints } from './gamut_viewer.js';
+import { initGamutViewer } from './gamut_viewer.js';
 import { initPresets } from './presets.js';
 import { wizardState } from './state.js';
 import { logger } from './logger.js';
@@ -12,36 +12,6 @@ import { CgatsInterop } from './cgats_interop.js';
 
 const { invoke } = window.__TAURI__.core;
 
-let mainWindowShown = false;
-
-async function revealMainWindow() {
-  if (mainWindowShown) return;
-  mainWindowShown = true;
-  try {
-    await invoke('show_main_window');
-  } catch (e) {
-    mainWindowShown = false;
-    console.warn('[ICCery] show_main_window failed:', e);
-  }
-}
-
-function maybeShowConstrainedGpuNotice(info) {
-  if (!info || info.os !== 'macos') return;
-  const intel = info.arch === 'x86_64' || info.arch === 'x86';
-  const major = typeof info.macos_major === 'number' ? info.macos_major : null;
-  if (!intel || (major !== null && major >= 13)) return;
-  const key = 'iccery.macos-intel-webgl-notice';
-  try {
-    if (sessionStorage.getItem(key)) return;
-    sessionStorage.setItem(key, '1');
-  } catch (_) { /* private mode */ }
-  wizardState.showNotice(
-    'On this Mac the 3D gamut view may be unavailable. Profiling stages still work.',
-    'info',
-    8000
-  );
-}
-
 document.addEventListener('DOMContentLoaded', () => {
   // Initialize interoperability handlers
   new CgatsInterop(wizardState);
@@ -69,13 +39,6 @@ document.addEventListener('DOMContentLoaded', () => {
     wizardState.updateGating();
   });
 
-  document.addEventListener('visibilitychange', () => {
-    logger.warn(`Frontend visibilitychange hidden=${document.hidden}`, 'WebView');
-  });
-  window.addEventListener('pagehide', () => {
-    logger.warn('Frontend pagehide', 'WebView');
-  });
-
   // Initialize gating on load
   wizardState.updateGating();
 
@@ -91,12 +54,6 @@ document.addEventListener('DOMContentLoaded', () => {
       const buildDateEl = document.getElementById('aboutBuildDate');
       if (versionEl && info.version) versionEl.textContent = `v${info.version}`;
       if (buildDateEl && info.build_date) buildDateEl.textContent = info.build_date;
-      setGpuHints({
-        arch: info.arch,
-        os: info.os,
-        macosMajor: info.macos_major,
-      });
-      maybeShowConstrainedGpuNotice(info);
     } catch (e) {
       console.warn('[ICCery] Could not load dynamic app info:', e);
     }
@@ -125,23 +82,13 @@ document.addEventListener('DOMContentLoaded', () => {
     }
   };
 
-  // Initialize all stages & features safely.
+  // Initialize all stages & features safely
-  // Gamut Viewer is deferred until Stage 5 is shown (eager WebGL on launch
-  // respawns WKWebView on Monterey Intel).
   safeInit('Stage 1 (Targen)', initTargen);
   safeInit('Stage 2 (Printtarg)', initPrinttarg);
   safeInit('Stage 3 (Chartread)', initChartread);
   safeInit('Stage 4 (Colprof)', initColprof);
   safeInit('Stage 5 (Profcheck)', initProfcheck);
   safeInit('Settings', initSettings);
+  safeInit('Gamut Viewer', initGamutViewer);
   safeInit('Presets', initPresets);
-
-  // Double-rAF waits for layout + first paint of the dark CSS.
-  requestAnimationFrame(() => {
-    requestAnimationFrame(() => {
-      revealMainWindow();
-    });
-  });
-  // Fallback so a JS exception cannot leave a permanently hidden window.
-  setTimeout(revealMainWindow, 1500);
 });

src/js/gamut_viewer.js

@@ -1,210 +1,21 @@
 import { computeQuickHull } from "./vendor/quickhull.js";
 import { labToSrgb } from "./color_convert.js";
-import { logger } from "./logger.js";
 
 const invoke = typeof window !== 'undefined' && window.__TAURI__?.core?.invoke ? window.__TAURI__.core.invoke : null;
 
-export const WEBGL_UNAVAILABLE_MESSAGE =
-    "3D gamut viewer requires WebGL; the rest of ICCery still works.";
-
 let scene, camera, renderer, labelRenderer, controls;
 let currentProfileMesh = null;
 let sRgbGroup = null;
 let axisScaffoldGroup = null;
-let resizeObserver = null;
-
-let gamutViewerReady = false;
-let gamutViewerInitStarted = false;
-let gamutViewerUnavailable = false;
-let animationRunning = false;
-let contextLost = false;
-let togglesWired = false;
-let gpuHints = {};
-
-export function setGpuHints(hints) {
-    gpuHints = { ...gpuHints, ...(hints || {}) };
-}
-
-export function isGamutViewerReady() {
-    return gamutViewerReady;
-}
-
-/**
- * Feature-detect WebGL before constructing THREE.WebGLRenderer.
- * @param {typeof document} [doc]
- * @returns {boolean}
- */
-export function webglAvailable(doc = (typeof document !== 'undefined' ? document : null)) {
-    if (!doc || typeof doc.createElement !== 'function') return false;
-    try {
-        const c = doc.createElement('canvas');
-        if (!c || typeof c.getContext !== 'function') return false;
-        return !!(c.getContext('webgl2') || c.getContext('webgl') || c.getContext('experimental-webgl'));
-    } catch {
-        return false;
-    }
-}
-
-/**
- * Heuristic for Monterey Intel / Rosetta: drop antialias and cap DPR.
- * Prefer backend `arch` from `get_app_info` so Apple Silicon is not treated as Intel
- * (Safari still reports `navigator.platform === "MacIntel"` on ARM).
- *
- * @param {{ navigator?: Navigator, arch?: string, macosMajor?: number }} [hints]
- * @returns {boolean}
- */
-export function isLikelyConstrainedGpu(hints = {}) {
-    const merged = { ...gpuHints, ...hints };
-    const arch = String(merged.arch || '');
-    if (arch) {
-        return arch === 'x86_64' || arch === 'x86' || arch === 'ia32';
-    }
-    const nav = merged.navigator || (typeof navigator !== 'undefined' ? navigator : {});
-    const uaDataArch = nav.userAgentData && nav.userAgentData.architecture;
-    if (uaDataArch) {
-        return /x86/i.test(String(uaDataArch));
-    }
-    const ua = String(nav.userAgent || '');
-    const platform = String(nav.platform || '');
-    const looksMac = /Macintosh|Mac OS X|MacIntel/i.test(`${platform} ${ua}`);
-    if (!looksMac) return false;
-    if (/ARM|Apple Silicon|aarch64/i.test(ua)) return false;
-    // Intel Mac UA historically includes "Intel"; Apple Silicon UA often does not.
-    if (/Intel/i.test(ua) || /MacIntel/i.test(platform)) {
-        const major = merged.macosMajor;
-        if (typeof major === 'number') return major < 13;
-        return true;
-    }
-    return false;
-}
-
-function showGamutFallback(container, message, { reloadable = false } = {}) {
-    if (!container) return;
-    container.innerHTML = '';
-    const el = document.createElement('div');
-    el.className = 'gamut-webgl-fallback';
-    el.setAttribute('role', 'status');
-    const p = document.createElement('p');
-    p.textContent = message;
-    el.appendChild(p);
-    if (reloadable) {
-        const btn = document.createElement('button');
-        btn.type = 'button';
-        btn.className = 'secondary btn-md';
-        btn.textContent = 'Reload 3D view';
-        btn.addEventListener('click', () => {
-            disposeViewer();
-            ensureGamutViewer();
-        });
-        el.appendChild(btn);
-    }
-    container.appendChild(el);
-}
-
-function stopAnimate() {
-    animationRunning = false;
-}
-
-function startAnimate() {
-    if (!renderer || contextLost) return;
-    if (animationRunning) return;
-    animationRunning = true;
-    animate();
-}
-
-function disposeViewer() {
-    stopAnimate();
-    if (resizeObserver) {
-        try { resizeObserver.disconnect(); } catch (_) { /* ignore */ }
-        resizeObserver = null;
-    }
-    if (renderer) {
-        try {
-            renderer.dispose();
-        } catch (_) { /* ignore */ }
-        if (renderer.domElement && renderer.domElement.parentNode) {
-            renderer.domElement.parentNode.removeChild(renderer.domElement);
-        }
-    }
-    if (labelRenderer && labelRenderer.domElement && labelRenderer.domElement.parentNode) {
-        labelRenderer.domElement.parentNode.removeChild(labelRenderer.domElement);
-    }
-    renderer = null;
-    scene = null;
-    camera = null;
-    controls = null;
-    labelRenderer = null;
-    currentProfileMesh = null;
-    sRgbGroup = null;
-    axisScaffoldGroup = null;
-    gamutViewerReady = false;
-    gamutViewerInitStarted = false;
-    contextLost = false;
-}
-
-/**
- * Create the Three.js renderer the first time Stage 5 is shown.
- * Safe to call repeatedly; a second call does not leak a renderer.
- */
-export function ensureGamutViewer() {
-    if (gamutViewerUnavailable) return;
-    if (gamutViewerReady) {
-        startAnimate();
-        return;
-    }
-    const stage5 = typeof document !== 'undefined' ? document.getElementById('stage-5') : null;
-    if (stage5 && stage5.classList.contains('hidden')) return;
-
-    const kick = () => {
-        if (gamutViewerUnavailable) return;
-        if (gamutViewerReady) {
-            startAnimate();
-            return;
-        }
-        const s = typeof document !== 'undefined' ? document.getElementById('stage-5') : null;
-        if (s && s.classList.contains('hidden')) return;
-        initGamutViewer();
-    };
-
-    if (typeof requestAnimationFrame === 'function') {
-        requestAnimationFrame(kick);
-    } else {
-        kick();
-    }
-}
-
-export function pauseGamutViewer() {
-    stopAnimate();
-}
-
-export function resumeGamutViewer() {
-    if (gamutViewerReady && !contextLost) startAnimate();
-}
 
 // ─────────────────────────────────────────────────────────────────────────────
 // Public: initialise the gamut viewer
 // ─────────────────────────────────────────────────────────────────────────────
 export async function initGamutViewer() {
-    if (gamutViewerReady || gamutViewerInitStarted) return;
-    gamutViewerInitStarted = true;
-
-    const container = typeof document !== 'undefined'
-        ? document.getElementById('gamutViewerContainer')
-        : null;
-    if (!container || typeof THREE === 'undefined') {
-        gamutViewerInitStarted = false;
-        return;
-    }
-
-    if (!webglAvailable()) {
-        gamutViewerUnavailable = true;
-        gamutViewerInitStarted = false;
-        logger.warn(WEBGL_UNAVAILABLE_MESSAGE, 'GamutViewer');
-        showGamutFallback(container, WEBGL_UNAVAILABLE_MESSAGE);
-        return;
-    }
-
     try {
+        const container = document.getElementById('gamutViewerContainer');
+        if (!container || typeof THREE === 'undefined') return;
+
         // Clear any existing contents if re-initialised
         container.innerHTML = "";
 
@@ -214,43 +25,17 @@ export async function initGamutViewer() {
         const width  = container.clientWidth  > 0 ? container.clientWidth  : 500;
         const height = container.clientHeight > 0 ? container.clientHeight : 400;
 
-        const lowPower = isLikelyConstrainedGpu();
+        // ── WebGL renderer ────────────────────────────────────────────────────
-        logger.info(
-            `Creating WebGLRenderer (lowPower=${lowPower}, arch=${gpuHints.arch || 'unknown'}, dpr=${window.devicePixelRatio || 1})`,
-            'GamutViewer'
-        );
-
         camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 2000);
         camera.position.set(180, 120, 180);
 
-        renderer = new THREE.WebGLRenderer({
+        renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
-            antialias: !lowPower,
-            alpha: false,
-            powerPreference: lowPower ? 'low-power' : 'default',
-            failIfMajorPerformanceCaveat: false,
-        });
         renderer.setSize(width, height);
-        renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, lowPower ? 1 : 2));
+        renderer.setPixelRatio(window.devicePixelRatio || 1);
         renderer.domElement.style.touchAction = 'none';
         renderer.domElement.style.display = 'block';
         container.appendChild(renderer.domElement);
 
-        renderer.domElement.addEventListener('webglcontextlost', (e) => {
-            e.preventDefault();
-            contextLost = true;
-            stopAnimate();
-            logger.error('WebGL context lost', 'GamutViewer');
-            showGamutFallback(container, '3D view lost its GPU context. Profiling stages still work.', {
-                reloadable: true,
-            });
-        });
-        renderer.domElement.addEventListener('webglcontextrestored', () => {
-            logger.warn('WebGL context restored — rebuilding viewer', 'GamutViewer');
-            contextLost = false;
-            disposeViewer();
-            ensureGamutViewer();
-        });
-
         // ── CSS2D label renderer ──────────────────────────────────────────────
         if (typeof THREE.CSS2DRenderer !== 'undefined') {
             labelRenderer = new THREE.CSS2DRenderer();
@@ -289,24 +74,21 @@ export async function initGamutViewer() {
         buildAxisScaffold();
 
         // ── Resize handling ───────────────────────────────────────────────────
-        if (typeof ResizeObserver !== 'undefined') {
+        const resizeObserver = new ResizeObserver((entries) => {
-            resizeObserver = new ResizeObserver((entries) => {
+            for (const entry of entries) {
-                for (const entry of entries) {
+                const w = entry.contentRect.width;
-                    const w = entry.contentRect.width;
+                const h = entry.contentRect.height;
-                    const h = entry.contentRect.height;
+                if (w > 0 && h > 0 && renderer && camera) {
-                    if (w > 0 && h > 0 && renderer && camera) {
+                    camera.aspect = w / h;
-                        camera.aspect = w / h;
+                    camera.updateProjectionMatrix();
-                        camera.updateProjectionMatrix();
+                    renderer.setSize(w, h);
-                        renderer.setSize(w, h);
+                    if (labelRenderer) labelRenderer.setSize(w, h);
-                        if (labelRenderer) labelRenderer.setSize(w, h);
-                    }
                 }
-            });
+            }
-            resizeObserver.observe(container);
+        });
-        }
+        resizeObserver.observe(container);
 
-        gamutViewerReady = true;
+        animate();
-        startAnimate();
 
         // ── Wire toggle controls ──────────────────────────────────────────────
         _wireToggles();
@@ -315,16 +97,7 @@ export async function initGamutViewer() {
         loadSrgbReferenceGamut();
 
     } catch (err) {
-        logger.error(`Gamut viewer initialisation failed: ${err?.stack || err}`, 'GamutViewer');
+        console.warn("Gamut viewer initialisation notice:", err);
-        gamutViewerInitStarted = false;
-        gamutViewerReady = false;
-        try {
-            if (renderer && renderer.domElement && renderer.domElement.parentNode) {
-                renderer.domElement.parentNode.removeChild(renderer.domElement);
-            }
-        } catch (_) { /* ignore */ }
-        renderer = null;
-        showGamutFallback(container, WEBGL_UNAVAILABLE_MESSAGE, { reloadable: true });
     }
 }
 
@@ -332,9 +105,7 @@ export async function initGamutViewer() {
 // Animation loop
 // ─────────────────────────────────────────────────────────────────────────────
 function animate() {
-    if (!animationRunning) return;
     requestAnimationFrame(animate);
-    if (contextLost || !renderer) return;
     if (controls) controls.update();
     if (renderer && scene && camera) {
         renderer.render(scene, camera);
@@ -789,8 +560,6 @@ export function toggleAxes(visible) {
 // Wire legend toggle checkboxes, opacity sliders, and reset button
 // ─────────────────────────────────────────────────────────────────────────────
 function _wireToggles() {
-    if (togglesWired) return;
-    togglesWired = true;
     const bindings = [
         ['chkProfileGamut',   toggleProfileGamut  ],
         ['chkSrgbReference',  toggleSrgbReference ],

src/js/gamut_viewer.test.js

@@ -12,37 +12,15 @@ if (typeof window === 'undefined') {
       event: { listen: () => Promise.resolve(() => {}) }
     },
     addEventListener: () => {},
-    dispatchEvent: () => {},
+    dispatchEvent: () => {}
-    devicePixelRatio: 1
   };
   globalThis.document = {
     getElementById: () => null,
-    querySelectorAll: () => [],
+    querySelectorAll: () => []
-    createElement: (tag) => {
-      if (tag === 'canvas') {
-        return { getContext: () => null };
-      }
-      return {
-        style: {},
-        appendChild() {},
-        addEventListener() {},
-        textContent: '',
-        className: '',
-        setAttribute() {}
-      };
-    }
   };
 }
 
-const {
+const { parseGamutFile } = await import('./gamut_viewer.js');
-  parseGamutFile,
-  webglAvailable,
-  isLikelyConstrainedGpu,
-  ensureGamutViewer,
-  isGamutViewerReady,
-  WEBGL_UNAVAILABLE_MESSAGE,
-  setGpuHints,
-} = await import('./gamut_viewer.js');
 
 let passed = 0;
 let total = 0;
@@ -54,13 +32,6 @@ export function runAll() {
   testParseGamutBasic();
   testParseGamutDualTable();
   testParseGamutWithComments();
-  testWebglAvailableFalseWithoutContext();
-  testWebglAvailableTrueWithWebgl();
-  testConstrainedGpuPrefersBackendArch();
-  testConstrainedGpuIgnoresAppleSiliconUa();
-  testConstrainedGpuIntelMac();
-  testEnsureGamutViewerNoopsWithoutDom();
-  testFallbackMessage();
   console.log(`\nResults: ${passed} / ${total} tests passed.`);
   console.groupEnd();
 
@@ -81,17 +52,6 @@ function assertEqual(actual, expected, message) {
   return ok;
 }
 
-function assert(ok, message) {
-  total++;
-  if (ok) {
-    passed++;
-    console.log('PASS:', message);
-  } else {
-    console.error('FAIL:', message);
-  }
-  return ok;
-}
-
 function testParseGamutBasic() {
   const text = `GAMUT file
 BEGIN_DATA
@@ -149,81 +109,6 @@ END_DATA`;
   assertEqual(faces.length, 2, 'commented gamut face count');
 }
 
-function testWebglAvailableFalseWithoutContext() {
-  const doc = {
-    createElement: () => ({ getContext: () => null })
-  };
-  assertEqual(webglAvailable(doc), false, 'webglAvailable is false when no context');
-  assertEqual(webglAvailable(null), false, 'webglAvailable is false without document');
-}
-
-function testWebglAvailableTrueWithWebgl() {
-  const doc = {
-    createElement: () => ({
-      getContext: (type) => (type === 'webgl' ? {} : null)
-    })
-  };
-  assertEqual(webglAvailable(doc), true, 'webglAvailable is true with webgl context');
-}
-
-function testConstrainedGpuPrefersBackendArch() {
-  setGpuHints({});
-  assertEqual(
-    isLikelyConstrainedGpu({ arch: 'aarch64', navigator: { platform: 'MacIntel', userAgent: 'Macintosh; Intel Mac OS X 12_7' } }),
-    false,
-    'Apple Silicon arch is not constrained even if platform is MacIntel'
-  );
-  assertEqual(
-    isLikelyConstrainedGpu({ arch: 'x86_64', navigator: { platform: 'MacIntel' } }),
-    true,
-    'x86_64 arch is constrained'
-  );
-}
-
-function testConstrainedGpuIgnoresAppleSiliconUa() {
-  setGpuHints({});
-  assertEqual(
-    isLikelyConstrainedGpu({
-      navigator: { platform: 'MacIntel', userAgent: 'Macintosh; ARM Mac OS X 14_0 Apple Silicon' }
-    }),
-    false,
-    'ARM / Apple Silicon UA is not constrained'
-  );
-}
-
-function testConstrainedGpuIntelMac() {
-  setGpuHints({});
-  assertEqual(
-    isLikelyConstrainedGpu({
-      macosMajor: 12,
-      navigator: { platform: 'MacIntel', userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 12_7_6)' }
-    }),
-    true,
-    'Monterey Intel UA is constrained'
-  );
-  assertEqual(
-    isLikelyConstrainedGpu({
-      arch: 'x86_64',
-      macosMajor: 14,
-      navigator: { platform: 'MacIntel', userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_0)' }
-    }),
-    true,
-    'Intel arch stays constrained on Ventura+'
-  );
-}
-
-function testEnsureGamutViewerNoopsWithoutDom() {
-  ensureGamutViewer();
-  assertEqual(isGamutViewerReady(), false, 'ensureGamutViewer does not create a renderer without Stage 5 DOM / THREE');
-}
-
-function testFallbackMessage() {
-  assert(
-    WEBGL_UNAVAILABLE_MESSAGE.includes('requires WebGL'),
-    'fallback copy mentions WebGL'
-  );
-}
-
 // Auto-run if executed in Node.js
 if (typeof process !== 'undefined' && process.argv && process.argv[1]?.endsWith('gamut_viewer.test.js')) {
   runAll();

src/js/state.js

@@ -1,5 +1,3 @@
-import { ensureGamutViewer, pauseGamutViewer } from './gamut_viewer.js';
-
 const { invoke } = window.__TAURI__.core;
 
 export const wizardState = {
@@ -80,12 +78,6 @@ export const wizardState = {
     });
 
     window.dispatchEvent(new CustomEvent('stage-changed', { detail: { stage: stageNumber } }));
-
-    if (stageNumber === 5) {
-      ensureGamutViewer();
-    } else {
-      pauseGamutViewer();
-    }
   },
 
   async navigateToStage(stageNumber) {

src/styles/main.css

@@ -1491,25 +1491,6 @@ button.danger:hover {
   width: 100% !important;
 }
 
-.gamut-webgl-fallback {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  gap: 16px;
-  min-height: 280px;
-  padding: 28px 24px;
-  color: #c8c8d0;
-  background: #0e0e14;
-  text-align: center;
-}
-
-.gamut-webgl-fallback p {
-  margin: 0;
-  max-width: 28rem;
-  line-height: 1.5;
-}
-
 /* ── Legend / controls panel ─────────────────────────────────────────────── */
 
 .gamut-controls-panel {