diff --git a/CLAUDE.md b/CLAUDE.md
index 8dacb34..823f6cb 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -30,7 +30,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 it reports headset/environment sensors to Home Assistant, offers services Home Assistant can
 call (e.g. notifications in the headset), and shows a Home Assistant dashboard as a SteamVR
 dashboard tab. Status: the overlay platform works; the Home Assistant parts are being built
-(implementation iteration 1: settings file and the "HA Dashboard" web UI tab).
+(implementation iteration 1: settings file; the web UI tab was dropped, see REQUIREMENTS.md D40).
 
 **Start every session by reading `docs/PROGRESS.md`** (current state, next steps, log).
 
@@ -61,7 +61,7 @@ cmake --preset native-debug && cmake --build --preset native-debug   # system Qt
 ctest --preset native-debug                                          # all tests
 build/native-debug/bin/tst_inputbridge clickUsesGlCoordinates        # one QtTest function
 build/native-debug/bin/frame-assistant --desktop       # UI preview in a window, no SteamVR
-build/native-debug/bin/frame-assistant --snapshot x.png  # x-0.png (main tab), x-dashboard.png
+build/native-debug/bin/frame-assistant --snapshot x.png  # one frame via the real offscreen path
 scripts/container-build.sh cross    # x86_64 → aarch64 against the Frame's system Qt (default)
 scripts/container-build.sh native   # same for the host arch (use on the Frame)
 scripts/container-build.sh cross-bundle   # fallback: self-contained, Qt bundled (also native-bundle)
@@ -72,9 +72,8 @@ build/native-debug/bin/frame-assistant --graphics-api vulkan --benchmark 600  #
 ```
 
 - Use `--snapshot` and then read the PNGs to check UI or rendering changes without a headset.
-  With several surfaces it writes `<name>-<id>.png` per surface (`-0` for the main tab's
-  empty id). Snapshot and benchmark don't load the settings, so the "HA Dashboard" tab shows
-  its "no URL" hint there.
+  With several surfaces it writes `<name>-<id>.png` per surface (`-0` for an empty id).
+  Snapshot and benchmark don't load the settings.
 - Overlay and desktop mode need a settings file; pass a test one with `--config <path>`.
 - `tst_render` runs once per backend (`VRDASH_TEST_API`, separate CTest entries, because the
   Qt graphics API is process-global). It QSKIPs without a GPU context or when Vulkan isn't
@@ -198,16 +197,16 @@ into Qt events.
   `create()` (e.g. give the constructor a required `QObject* parent` and init it `{nullptr}`).
 - **App code layout:** logic without SteamVR or rendering goes into the static library
   `frameassistant_lib` (`src/config/`, …), which the app and its tests link. QML types
-  (`QML_ELEMENT`, e.g. `src/ha/HaWebUi`) go into `QML_SOURCES` of `vrdash_add_dashboard()`:
+  (`QML_ELEMENT`) go into `QML_SOURCES` of `vrdash_add_dashboard()`:
   they must be part of the QML module. The generated type registration includes their
   headers by file name only, so their directory is on the app's include path.
 - **Settings** (`src/config/Config`) are loaded once in `Dashboard::prepare()` (overlay and
   desktop mode) and passed on as an immutable value (DESIGN.md, D19).
-- **Qt WebEngine** ("HA Dashboard" tab): `QtWebEngineQuick::initialize()` runs in `main()`
-  before the app object, because it must precede the `QGuiApplication`. `HaWebUi` creates a
-  persistent profile under `~/.local/share/frameassistant/webengine` with the Qt 6.8 API
-  (setters on `QQuickWebEngineProfile`). Qt ≥ 6.9 logs a hint to use
-  `WebEngineProfilePrototype` instead, which the Frame's Qt 6.8 doesn't have.
+- **No Qt WebEngine** (REQUIREMENTS.md, D40): the Frame's system WebEngine can't be loaded, and bundling our own
+  failed (STEAM-FRAME.md). Don't link it: the whole app would fail to start on the Frame.
+- **Check Frame libraries by loading, not by file:** before relying on a system library, check
+  `ldd <lib> | grep "not found"` and that its package version matches the rest of Qt
+  (`pacman -Q | grep qt6-`).
 - **moc and raw string literals:** a raw string containing `//` (e.g. a URL) makes moc treat
   the rest as a comment; it then misses `Q_OBJECT` classes in that file (link error "vtable
   for …"). In moc'ed files, write such text as normal string literals (`tst_config` uses
@@ -333,5 +332,3 @@ Check these when testing on the device, and update this list:
 - The restructured app code (base class `DashboardApplication`, `Surface`, `Overlay` base,
   active-surface navigation) has only been tested off the device so far.
 - Several dashboard tabs from one process (works in `tst_surfaces`, not tried in SteamVR).
-- Qt WebEngine in the off-screen renderer (Vulkan and OpenGL), the SteamVR keyboard in web
-  page input fields, and the persistent login ("HA Dashboard" tab, DSH-1).
diff --git a/CMakePresets.json b/CMakePresets.json
index b83f485..dd55c75 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -41,8 +41,7 @@
       "cacheVariables": {
         "CMAKE_BUILD_TYPE": "RelWithDebInfo",
         "VRDASH_DEPLOY_QT": "ON",
-        "VRDASH_BUILD_TESTS": "OFF",
-        "VRDASH_WEBENGINE_PROCESS": "/opt/qt6-arm64/usr/lib/qt6/libexec/QtWebEngineProcess"
+        "VRDASH_BUILD_TESTS": "OFF"
       }
     },
     {
diff --git a/README.md b/README.md
index 97c5386..517dc06 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,7 @@ the headset to Home Assistant in both directions:
 - **Dashboard:** a SteamVR dashboard tab to view and control Home Assistant from inside VR.
 
 > **Status:** early development. The overlay platform works on the Frame. The Home Assistant
-> parts are being built: so far a settings file and an "HA Dashboard" tab with Home
-> Assistant's web UI. See [docs/REQUIREMENTS.md](docs/REQUIREMENTS.md),
+> parts are being built: so far the settings file. See [docs/REQUIREMENTS.md](docs/REQUIREMENTS.md),
 > [docs/DESIGN.md](docs/DESIGN.md) and [docs/PROGRESS.md](docs/PROGRESS.md).
 
 ### Platform
@@ -34,8 +33,8 @@ FrameAssistant grew out of a SteamVR dashboard-overlay template, which it still
 ## Quick start
 
 Requirements:
-- CMake ≥ 3.22, Ninja, a C++20 compiler, and Qt ≥ 6.5 (Quick, QuickControls2, OpenGL,
-  WebEngineQuick; Test for the tests)
+- CMake ≥ 3.22, Ninja, a C++20 compiler, and Qt ≥ 6.5 (Quick, QuickControls2, OpenGL;
+  Test for the tests)
 - Vulkan headers (optional; without them the build is OpenGL only)
 - Docker or Podman, for the Frame builds
 
@@ -47,7 +46,7 @@ cmake --preset native-debug && cmake --build --preset native-debug
 ctest --preset native-debug
 
 build/native-debug/bin/frame-assistant --desktop            # UI in windows, no SteamVR
-build/native-debug/bin/frame-assistant --snapshot out.png   # one frame per tab through the VR path
+build/native-debug/bin/frame-assistant --snapshot out.png   # one frame through the VR path
 build/native-debug/bin/frame-assistant                      # as dashboard tab (SteamVR running)
 build/native-debug/bin/frame-assistant --install-manifest   # register + auto-start with SteamVR
 ```
@@ -89,15 +88,12 @@ FrameAssistant reads its settings from `~/.config/frameassistant/config.json`
 | `mqtt.tls.ca_file` | no | system certificates | CA of the broker's certificate |
 | `mqtt.tls.cert_file`, `mqtt.tls.key_file` | no | | Client certificate |
 | `homeassistant.discovery_prefix` | no | `homeassistant` | |
-| `homeassistant.url` | no | | Home Assistant web UI for the "HA Dashboard" tab |
+| `homeassistant.url` | no | | Home Assistant's address; reserved for the dashboard, not used yet |
 | `notifications.timeout_s` | no | 10 | How long notifications stay |
 
 Invalid or missing settings stop the app with an error message and exit code 1. Unknown keys
 only produce a warning. Keep the file private (`chmod 600`) when it holds a password.
 
-The "HA Dashboard" tab keeps the Home Assistant login in
-`~/.local/share/frameassistant/webengine`.
-
 ## Development
 
 - **App identity** (app key `net.matzman.frameassistant`, tab name, executable name
@@ -149,7 +145,6 @@ VK_DRIVER=lvp scripts/container-test.sh   # same on the lavapipe software driver
 |------|---------|
 | `src/main.cpp`, `src/Dashboard.*`, `src/qml/` | **The app** |
 | `src/config/` | Settings file (`frameassistant_lib`) |
-| `src/ha/` | Home Assistant parts: `HaWebUi` (web UI tab) |
 | `src/app/` | `DashboardApplication` (app base class), `Surface` (one view) |
 | `src/render/` | Off-screen Qt Quick renderer; Vulkan and OpenGL backends |
 | `src/vr/` | SteamVR connection, overlays (dashboard tab) |
@@ -162,6 +157,5 @@ VK_DRIVER=lvp scripts/container-test.sh   # same on the lavapipe software driver
 
 ## License
 
-MIT, see [LICENSE](LICENSE). Third-party components (OpenVR SDK, Qt incl. Qt WebEngine; in
-bundled builds also their dependencies) are listed in
-[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
+MIT, see [LICENSE](LICENSE). Third-party components (OpenVR SDK, Qt; in bundled builds also
+their dependencies) are listed in [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
diff --git a/THIRD_PARTY_NOTICES.md b/THIRD_PARTY_NOTICES.md
index 0a21361..a25d79f 100644
--- a/THIRD_PARTY_NOTICES.md
+++ b/THIRD_PARTY_NOTICES.md
@@ -7,7 +7,6 @@ This project is MIT-licensed (see `LICENSE`). `<project>` below is the CMake pro
 |-----------|---------|----------------|
 | [OpenVR SDK](https://github.com/ValveSoftware/openvr) (`libopenvr_api.so`, `openvr.h`) | BSD-3-Clause | Shipped in `lib/`; license in `share/doc/<project>/third-party/openvr.LICENSE` |
 | [Qt 6](https://www.qt.io/) (Core, Gui, Qml, Quick, Quick Controls, Wayland/XCB plugins) | LGPL-3.0 (Qt open-source license) | Linked dynamically. Default builds use the system's Qt (not shipped). Bundled builds ship Qt's shared libraries unmodified in `lib/`, `plugins/`, `qml/`: replace them to use another compatible Qt build |
-| [Qt WebEngine](https://doc.qt.io/qt-6/qtwebengine-index.html) (Quick), for the "HA Dashboard" tab | LGPL-3.0; contains Chromium (BSD-3-Clause and further licenses, listed by Qt WebEngine) | Linked dynamically, from the system's Qt; not shipped. Bundled builds don't support it yet |
 
 **Bundled builds** (`--bundle-qt`) also ship further shared libraries that Qt depends on,
 taken unmodified from Debian. Their copyright and license files are in
diff --git a/cmake/BundleQt.cmake b/cmake/BundleQt.cmake
index 5abb177..f26d070 100644
--- a/cmake/BundleQt.cmake
+++ b/cmake/BundleQt.cmake
@@ -30,14 +30,6 @@ set(VRDASH_BUNDLE_PLUGINS
     wayland-shell-integration/*.so wayland-graphics-integration-client/*.so
     wayland-decoration-client/*.so xcbglintegrations/*.so)
 
-# Qt WebEngine (bundled only if a dashboard needs it): its helper process, resources and
-# locales. Cross builds point VRDASH_WEBENGINE_PROCESS at the target's QtWebEngineProcess
-# (Debian can't install the arm64 one next to the host's; see docker/cross-arm64.Dockerfile).
-set(VRDASH_WEBENGINE_PROCESS "" CACHE FILEPATH
-    "QtWebEngineProcess to bundle (default: the one of the Qt used for the build)")
-# Locales shipped with WebEngine (the full set is about 35 MB).
-set(VRDASH_WEBENGINE_LOCALES en-US de)
-
 function(vrdash_bundle_qt)
     get_property(targets GLOBAL PROPERTY VRDASH_DASHBOARD_TARGETS)
     get_property(qml_dirs GLOBAL PROPERTY VRDASH_DASHBOARD_QML_DIRS)
@@ -60,14 +52,6 @@ function(vrdash_bundle_qt)
         set(qt_libdir ${qt_prefix}/lib/${CMAKE_LIBRARY_ARCHITECTURE}) # Debian multiarch
     endif()
 
-    # Used by the install script only if a bundled library is Qt WebEngine.
-    set(webengine_process ${VRDASH_WEBENGINE_PROCESS})
-    if(NOT webengine_process)
-        set(webengine_process ${QT6_INSTALL_PREFIX}/${QT6_INSTALL_LIBEXECS}/QtWebEngineProcess)
-    endif()
-    set(webengine_resources ${QT6_INSTALL_PREFIX}/${QT6_INSTALL_DATA}/resources)
-    set(webengine_locales ${QT6_INSTALL_PREFIX}/${QT6_INSTALL_TRANSLATIONS}/qtwebengine_locales)
-
     # The regexes end up inside a quoted string in the generated script: escape backslashes.
     string(REPLACE "\\" "\\\\" bundle_exclude "${VRDASH_BUNDLE_EXCLUDE}")
 
diff --git a/cmake/bundle-install.cmake.in b/cmake/bundle-install.cmake.in
index 4be871c..839033a 100644
--- a/cmake/bundle-install.cmake.in
+++ b/cmake/bundle-install.cmake.in
@@ -14,9 +14,6 @@ set(qt_plugins "@QT6_INSTALL_PREFIX@/@QT6_INSTALL_PLUGINS@")
 set(qt_qml "@QT6_INSTALL_PREFIX@/@QT6_INSTALL_QML@")
 set(patchelf "@VRDASH_PATCHELF@")
 set(exclude "@bundle_exclude@")
-set(webengine_process "@webengine_process@")
-set(webengine_resources "@webengine_resources@")
-set(webengine_locales "@webengine_locales@")
 
 message(STATUS "Bundling Qt into ${prefix}")
 
@@ -81,35 +78,6 @@ file(GET_RUNTIME_DEPENDENCIES
     RESOLVED_DEPENDENCIES_VAR resolved
     UNRESOLVED_DEPENDENCIES_VAR unresolved)
 
-# --- Qt WebEngine: helper process (and its libraries), resources, locales ----------------
-# Only if a dashboard uses it. Found through qt.conf (LibraryExecutables, Data,
-# Translations; written below).
-set(helper_executables "")
-if(resolved MATCHES "libQt6WebEngineCore")
-    message(STATUS "Bundling Qt WebEngine (${webengine_process})")
-    # TYPE PROGRAM: a plain file(INSTALL) would drop the executable bit.
-    file(INSTALL "${webengine_process}" DESTINATION "${prefix}/libexec" TYPE PROGRAM
-         FOLLOW_SYMLINK_CHAIN)
-    list(APPEND helper_executables "${prefix}/libexec/QtWebEngineProcess")
-    file(GET_RUNTIME_DEPENDENCIES
-        EXECUTABLES ${helper_executables}
-        DIRECTORIES "@qt_libdir@" "${libdir}"
-        PRE_EXCLUDE_REGEXES ${exclude}
-        POST_EXCLUDE_REGEXES "^${libdir}/"
-        RESOLVED_DEPENDENCIES_VAR helper_resolved
-        UNRESOLVED_DEPENDENCIES_VAR helper_unresolved)
-    list(APPEND resolved ${helper_resolved})
-    list(APPEND unresolved ${helper_unresolved})
-    list(REMOVE_DUPLICATES resolved)
-    list(REMOVE_DUPLICATES unresolved)
-    file(GLOB files LIST_DIRECTORIES false "${webengine_resources}/*")
-    file(INSTALL ${files} DESTINATION "${prefix}/resources")
-    foreach(locale @VRDASH_WEBENGINE_LOCALES@)
-        file(INSTALL "${webengine_locales}/${locale}.pak"
-             DESTINATION "${prefix}/translations/qtwebengine_locales")
-    endforeach()
-endif()
-
 if(unresolved)
     message(WARNING "Unresolved (expected on target system): ${unresolved}")
 endif()
@@ -131,7 +99,7 @@ foreach(lib IN LISTS bundled_libs)
         set_rpath("${lib}" "\$ORIGIN")
     endif()
 endforeach()
-foreach(file IN LISTS qt_plugin_files qml_plugins helper_executables)
+foreach(file IN LISTS qt_plugin_files qml_plugins)
     get_filename_component(dir "${file}" DIRECTORY)
     file(RELATIVE_PATH rel "${dir}" "${libdir}")
     set_rpath("${file}" "\$ORIGIN/${rel}")
@@ -144,14 +112,11 @@ find_program(dpkg dpkg)
 if(dpkg)
     set(docdir "${prefix}/@CMAKE_INSTALL_DOCDIR@/third-party")
     set(packages "")
-    foreach(file IN LISTS resolved qt_plugin_files qml_plugins helper_executables)
+    foreach(file IN LISTS resolved qt_plugin_files qml_plugins)
         # Ask dpkg about the original file: map installed plugins back, resolve
         # symlinks and /lib -> /usr/lib (usrmerge: packages register /usr paths).
         string(REPLACE "${plugindir}" "${qt_plugins}" original "${file}")
         string(REPLACE "${qmldir}" "${qt_qml}" original "${original}")
-        if(file STREQUAL "${prefix}/libexec/QtWebEngineProcess")
-            set(original "${webengine_process}")
-        endif()
         file(REAL_PATH "${original}" original)
         execute_process(COMMAND "${dpkg}" -S "${original}" OUTPUT_VARIABLE owner
                         ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
@@ -193,9 +158,6 @@ Prefix = ..
 Libraries = @CMAKE_INSTALL_LIBDIR@
 Plugins = plugins
 QmlImports = qml
-LibraryExecutables = libexec
-Data = .
-Translations = translations
 ")
 
 list(LENGTH resolved n_libs)
diff --git a/docker/cross-arm64.Dockerfile b/docker/cross-arm64.Dockerfile
index 51088e3..26a66fe 100644
--- a/docker/cross-arm64.Dockerfile
+++ b/docker/cross-arm64.Dockerfile
@@ -17,13 +17,4 @@ RUN dpkg --add-architecture arm64 \
         qml6-module-qtquick-layouts:arm64 qml6-module-qtquick-templates:arm64 \
         qml6-module-qtqml-workerscript:arm64 qml6-module-qtquick-window:arm64 \
         qt6-qpa-plugins:arm64 qt6-wayland:arm64 \
-        qt6-webengine-dev:arm64 qml6-module-qtwebengine:arm64 \
  && rm -rf /var/lib/apt/lists/*
-
-# Qt WebEngine's helper process for arm64 (bundled builds): its package is Multi-Arch: foreign
-# and can't be installed next to the amd64 one, so unpack it into its own directory.
-RUN apt-get update \
- && cd /tmp && apt-get download libqt6webenginecore6-bin:arm64 \
- && dpkg-deb -x libqt6webenginecore6-bin_*_arm64.deb /opt/qt6-arm64 \
- && rm -f libqt6webenginecore6-bin_*_arm64.deb && rm -rf /var/lib/apt/lists/* \
- && test -x /opt/qt6-arm64/usr/lib/qt6/libexec/QtWebEngineProcess
diff --git a/docker/native.Dockerfile b/docker/native.Dockerfile
index f0a582f..9e517e5 100644
--- a/docker/native.Dockerfile
+++ b/docker/native.Dockerfile
@@ -13,5 +13,4 @@ RUN apt-get update \
         qml6-module-qtquick qml6-module-qtquick-controls qml6-module-qtquick-layouts \
         qml6-module-qtquick-templates qml6-module-qtqml-workerscript qml6-module-qtquick-window \
         qml6-module-qttest qt6-qpa-plugins qt6-wayland \
-        qt6-webengine-dev qml6-module-qtwebengine \
  && rm -rf /var/lib/apt/lists/*
diff --git a/docs/DESIGN.md b/docs/DESIGN.md
index c6f6e3d..0893887 100644
--- a/docs/DESIGN.md
+++ b/docs/DESIGN.md
@@ -57,18 +57,15 @@ Three layers; dependencies only go downward (D17).
 
 - **MQTT is the only channel for everything device-related:** entities, services, availability
   (D24).
-- MQTT can't show HA as a whole (other entities' states, service calls for them), which the
-  dashboard (DSH-1) needs. The dashboard gets **its own channel, separate from MQTT**:
+- MQTT can't show HA as a whole (other entities' states, service calls for them), which a
+  dashboard needs. The dashboard gets **its own channel, separate from MQTT**:
   - Q2a, HA web UI in Qt WebEngine: the browser talks to HA itself (HTTP/WebSocket, HA's own
-    login); config: HA URL.
+    login); config: HA URL. **Failed on the Frame (D40)**: the system WebEngine can't be
+    loaded, a bundled one didn't work (STEAM-FRAME.md).
   - Q2b, native QML dashboard: HA's WebSocket API with a token (Q3) as another I/O component;
     config: HA URL and token.
-- Both fit the three layers. The MVP contains the web UI test (DSH-1, D28), which also serves
-  as the spike on WebEngine in the off-screen renderer; Q2/Q3 are decided for DSH-2.
-- Known DSH-1 risks: WebEngine must be initialised before the `QGuiApplication` (created by the
-  platform's base constructor), so the platform needs a small change; WebEngine with our
-  off-screen renderer, especially Vulkan, is untested; text fields inside the page probably
-  don't open the SteamVR keyboard (fallback: log in once in a desktop mode).
+- Both fit the three layers. The web UI test (DSH-1, D28) answered Q2a with "no"; Q2/Q3 are
+  decided for DSH-2, with the native dashboard as the candidate.
 
 ## Start-up and modes
 
@@ -102,7 +99,7 @@ Two overlay kinds in the platform (D25):
 | Main tab "Frame Assistant" (UI-1, later NOT-7, do-not-disturb) | dashboard tab | always there; SteamVR shows/hides it | ✓ |
 | Notifications | world overlay | the app (notification manager) shows/hides it | ✓ |
 | Status tab (SRV-6) | dashboard tab | exists only while cards exist (D9) | ✗ |
-| "HA Dashboard" (DSH-1, web UI test) | dashboard tab | always there | ✓ |
+| HA dashboard (DSH-2) | dashboard tab | always there | ✗ (web UI test DSH-1 removed, D40) |
 
 - **World overlays (MVP):** a new overlay kind next to the dashboard tab (CLAUDE.md, "Planned
   extension"). The surface gets a kind and a placement; renders only while visible (NFR-3).
@@ -150,7 +147,7 @@ and signals across threads are delivered through the receiver's event loop.
 | **I/O wrappers** | Data sources and actuators; know nothing about HA. One wrapper object per OpenVR interface used (e.g. `IVRSystem`, `IVRApplications`, `IVRChaperone`, `IVRSettings`). System wrappers (network, audio) later. | OpenVR ✓, system ✗ |
 | **Overlays** | View and controller of MVC (QML), as dashboard tabs or world overlays. Get their data (the model) from other objects. | ✓ |
 | **Managers** | One object per stateful feature that manages and coordinates it, using entities, services and overlays. Notification manager (MVP); status card manager (SRV-6/7) later. | notifications ✓ |
-| **HA web UI** | Encapsulates Qt WebEngine for the dashboard tab (DSH-1; Q2 for DSH-2). `src/ha/HaWebUi`, a QML singleton in the app itself (not `frameassistant_lib`: QML types must be part of the QML module). | ✓ (DSH-1) |
+| **HA web UI** | Was: Qt WebEngine for the dashboard tab (DSH-1). Dropped (D40); a native dashboard (DSH-2) would need its own object class. | ✗ |
 | **Configuration** | Settings from the JSON file, loaded once by the app as an immutable value. Each component gets the part it needs through its constructor (D19). | ✓ |
 | **App** | The managing object: owns all of the above as components and wires them together. | ✓ |
 
@@ -307,7 +304,7 @@ Layout follows common practice (e.g. Zigbee2MQTT's `…/<device>/set`); one topi
 | `mqtt.tls.ca_file` | no | system certificates | own CA, e.g. a self-signed broker certificate |
 | `mqtt.tls.cert_file` / `key_file` | no | none | client certificate, if the broker requires one |
 | `homeassistant.discovery_prefix` | no | `homeassistant` | |
-| `homeassistant.url` | for DSH-1 only | — | missing: the dashboard tab shows a hint instead of the web UI |
+| `homeassistant.url` | no | — | reserved for the dashboard (DSH-2); not used yet (D40) |
 | `notifications.timeout_s` | no | 10 | D33 |
 
 - Errors (missing required values, invalid JSON, wrong types): exit with a message and exit
@@ -447,4 +444,4 @@ Collected 2026-10-05 for the notification design.
 | D36 | 2026-10-05 | NFR-3 measured as own cost (CPU idle, frames while hidden, GPU per frame) plus an A/B comparison of the game's compositor statistics; manual in the MVP, a `--vr-stats` mode later | Measurable acceptance for NFR-3 without extra code in the MVP |
 | D37 | 2026-10-05 | The MVP is implemented in four iterations: 1 DSH-1 + configuration, 2 MQTT/HA device/UI-1, 3 sensors, 4 notifications | Small iterations (working rules); DSH-1 first because the user wants to see it early and it doesn't depend on MQTT |
 | D38 | 2026-10-05 | App-specific command-line options: the platform's base constructor takes an optional list of extra options, parses them with its own and exposes their values | The command line is parsed in the base constructor, before the derived app can contribute (`--config`); backward compatible, `--help` stays complete |
-| D39 | 2026-10-05 | DSH-1: `QtWebEngineQuick::initialize()` in `main.cpp` (no platform change); a named, persistent WebEngine profile under `~/.local/share/frameassistant/`; tab name "HA Dashboard" | WebEngine must be initialised before the `QGuiApplication`; the HA login must survive restarts |
+| D39 | 2026-10-05 | *Superseded by D40 (REQUIREMENTS.md): tab and WebEngine removed.* DSH-1: `QtWebEngineQuick::initialize()` in `main.cpp` (no platform change); a named, persistent WebEngine profile under `~/.local/share/frameassistant/`; tab name "HA Dashboard" | WebEngine must be initialised before the `QGuiApplication`; the HA login must survive restarts |
diff --git a/docs/PROGRESS.md b/docs/PROGRESS.md
index 68e1bcf..f72b290 100644
--- a/docs/PROGRESS.md
+++ b/docs/PROGRESS.md
@@ -5,12 +5,11 @@ CLAUDE.md ("Working rules").
 
 ## Current state
 
-- **Implementation iteration 1 (DSH-1 and configuration), phase 3 (implementation) done,
-  waiting for the user's approval.** All plan steps are implemented and committed; next is
-  phase 4, testing on the Frame (plan item 10).
-- Started by SteamVR, the app now logs to `logs/frame-assistant.log` in the install folder:
-  the manifest passes `--log-file` (CFG-2 wants the settings error in a log file). Whether
-  SteamVR on the Frame honours the manifest's `arguments` is checked in phase 4.
+- **Implementation iteration 1, phase 4 (testing on the Frame).** DSH-1 is done with a
+  negative result: HA's web UI via Qt WebEngine doesn't work on the Frame, so the "HA
+  Dashboard" tab and the WebEngine dependency were removed (D40). What remains of iteration 1
+  (platform hooks, settings file, `--config`, log file for SteamVR-started instances) still
+  needs its test on the Frame with the system-Qt package.
 
 ## Next steps
 
@@ -19,7 +18,7 @@ Requirements and design cover the whole MVP; it is **implemented in four small i
 
 | Iteration | Content | Platform change | Checked by |
 |---|---|---|---|
-| 1 | DSH-1: HA web UI (Qt WebEngine) in a dashboard tab; configuration (D34) with start-up hook and `--config` | start-up hook (D21), WebEngine initialisation before the `QGuiApplication` | HA web UI in the tab on the Frame; result documented |
+| 1 | ~~DSH-1: HA web UI in a dashboard tab~~ (failed, removed: D40); configuration (D34) with start-up hook and `--config`; log file for SteamVR-started instances | start-up hook (D21), app command-line options (D38) | DSH-1 result documented; app starts on the Frame with the settings file, settings errors in the log |
 | 2 | MQTT client (own thread), HA device with discovery and availability, libmosquitto in the package, status display UI-1 | modes (D22) | device appears in HA, online/offline right, reconnect works |
 | 3 | OpenVR wrappers and the 13 sensor entities | `--desktop` with optional SteamVR (D22) | sensor values in HA on the Frame |
 | 4 | notification manager, `notify` entity, world overlay | world overlay, premultiplied flag (D25) | notification from HA in VR, also in a game |
@@ -80,6 +79,12 @@ Known limitation: the bundled-Qt package does not support WebEngine in this iter
   present (relevant for Q2/Q3).
 - libmosquitto ABI check: Debian's 2.0.21 needs at most `OPENSSL_3.0.0`/`GLIBC_2.34`; the
   Frame has OpenSSL 3.2.1 and glibc 2.39. No libcjson dependency. D14 holds.
+- DSH-1 closed (D40): the bundling experiment failed (sandbox, ICU resources, Vulkan abort,
+  empty page with OpenGL and in a desktop window; details in STEAM-FRAME.md). At the user's
+  decision the "HA Dashboard" tab, `HaWebUi`, the WebEngine build dependency and the
+  bundler's WebEngine support were removed (reverts of the corresponding commits). Qt WebView
+  is no alternative (WebEngine backend on Linux). `homeassistant.url` stays reserved for
+  DSH-2, where a native dashboard is the candidate.
 - Phase 4 (testing on the Frame), first findings:
   - `deploy-to-frame.sh` exited silently without a bundled package in `dist/` (fixed).
   - The system-Qt package doesn't start: the Frame's Qt WebEngine is 6.7.0 (rest of Qt 6.8.0)
diff --git a/docs/REQUIREMENTS.md b/docs/REQUIREMENTS.md
index 22ef7b1..3557ba7 100644
--- a/docs/REQUIREMENTS.md
+++ b/docs/REQUIREMENTS.md
@@ -103,7 +103,7 @@ FrameAssistant.
 
 | ID | Requirement | Prio | MVP | Acceptance criteria |
 |----|-------------|------|-----|---------------------|
-| DSH-1 | A dashboard tab shows HA's web UI (Qt WebEngine) at a configured URL, as a "does it work out of the box" test. | M | ✓ | The page loads in VR and can be operated with the laser; whatever doesn't work out of the box is documented and moved to a later iteration. |
+| DSH-1 | A dashboard tab shows HA's web UI (Qt WebEngine) at a configured URL, as a "does it work out of the box" test. | M | ✓ | The page loads in VR and can be operated with the laser; whatever doesn't work out of the box is documented and moved to a later iteration. **Result (D40):** fails on the Frame; tab removed. |
 | DSH-2 | The full dashboard to control HA entities in VR: everything beyond DSH-1, e.g. login comfort, opening a given HA view (SRV-4), possibly a native approach (Q2, Q3). | S | | Defined after design exploration. |
 
 ### Non-functional (NFR)
@@ -133,7 +133,7 @@ FrameAssistant.
 | # | Question | Status |
 |---|----------|--------|
 | Q1 | Several notifications at once: stack, queue, replace by tag? | open, design exploration |
-| Q2 | Dashboard: HA's own web UI vs. native VR UI? | open, design exploration (Qt WebEngine exists on the Frame, Appendix C) |
+| Q2 | Dashboard: HA's own web UI vs. native VR UI? | open; HA's web UI via Qt WebEngine failed on the Frame (D40), so native is the candidate |
 | Q3 | Dashboard data: HA WebSocket API (token) in addition to MQTT, or MQTT only? | open, design |
 | Q4 | Which MQTT client library? Licence, availability on SteamOS, TLS/login support. | answered: libmosquitto, shipped in the package (D14, Appendix B) |
 | Q5 | Status card: own tab or part of the main tab? | answered: own tab, on demand (D9) |
@@ -163,6 +163,7 @@ FrameAssistant.
 | D15 | 2026-10-05 | HA MQTT discovery: **own small layer on Qt's JSON classes**, using device-based discovery (one `<prefix>/device/<id>/config` topic with all entities under `cmps`) | No suitable library (Appendix B); HA recommends device-based discovery for multi-entity devices (NFR-7) |
 | D20 | 2026-10-05 | New requirement UI-1 (status display in the main tab), MVP | Helps testing on the device; little effort |
 | D28 | 2026-10-05 | DSH-1 split: DSH-1 (MVP) = HA web UI in a tab as an out-of-the-box test; DSH-2 (Should) = the full dashboard. The MVP (D8) now also contains DSH-1 | The user wants to see early whether the simple variant works |
+| D40 | 2026-10-05 | DSH-1 done with a negative result: HA's web UI via Qt WebEngine doesn't work on the Frame (system WebEngine not loadable; bundling our own failed). The "HA Dashboard" tab and the WebEngine dependency are removed; the MVP no longer contains a dashboard. `homeassistant.url` stays reserved for DSH-2 | The out-of-the-box test answered its question; a WebEngine dependency would keep the whole app from starting on the Frame |
 
 Design decisions (D16 onward) are in [DESIGN.md](DESIGN.md).
 
@@ -273,7 +274,7 @@ use Qt's private API, which requires the exact Qt version.
 | Sounds, audio from URL | NOT-4, SRV-8 | Qt Multimedia + QtNetwork | ✓ `libQt6Multimedia`, FFmpeg plugin | no |
 | HTTPS (downloads, WebSocket) | SRV-8, Q3 | Qt TLS plugin | ✓ `libqopensslbackend.so` | no |
 | Translations | NFR-4 | `QTranslator`, `lupdate`/`lrelease` | ✓ (build-time tools) | no |
-| Dashboard, HA web UI | DSH-1, DSH-2, Q2 | Qt WebEngine (Quick) | **✗ present but not loadable**: 6.7.0 next to Qt 6.8.0, built against FFmpeg 6, which the Frame lacks (STEAM-FRAME.md) | yes, only bundled with all of Qt (experiment, see PROGRESS.md) |
+| Dashboard, HA web UI | DSH-1, DSH-2, Q2 | Qt WebEngine (Quick); **dropped (D40)** | **✗ present but not loadable**: 6.7.0 next to Qt 6.8.0, built against FFmpeg 6, which the Frame lacks (STEAM-FRAME.md) | bundling it with all of Qt was tried and failed (STEAM-FRAME.md) |
 | Dashboard, native UI | DSH-2, Q2/Q3 | HA WebSocket API via Qt WebSockets | ✓ `libQt6WebSockets` | no |
 | Haptics, fade, apps | SRV-1/2 | OpenVR | ✓ | no |
 | Tests | NFR-8 | QtTest | ✓ (host only) | no |
@@ -286,5 +287,5 @@ Also present and possibly useful later: `libQt6TextToSpeech`, Qt's `networkinfor
 Open points:
 - The Debian build container needs the matching `-dev` packages (amd64 and arm64) for every
   module used. Not checked yet.
-- WebEngine and Multimedia come with SteamOS's desktop (KDE) packages; a SteamOS update could
-  remove them.
+- Multimedia comes with SteamOS's desktop (KDE) packages; a SteamOS update could remove it.
+  (WebEngine likewise, but it isn't usable anyway, D40.)
diff --git a/docs/STEAM-FRAME.md b/docs/STEAM-FRAME.md
index 504bfc3..87ae562 100644
--- a/docs/STEAM-FRAME.md
+++ b/docs/STEAM-FRAME.md
@@ -70,7 +70,8 @@ Without the deploy script: copy the `.tar.gz`, unpack it on the Frame, run `./in
 Checked 2026-10-05; details per requirement in [REQUIREMENTS.md](REQUIREMENTS.md), Appendix C.
 
 - **System Qt 6.8.0** under `/usr/lib` includes, besides the base modules: DBus, Network,
-  Multimedia (FFmpeg plugin), WebSockets, WebEngine (Core, Quick), WebView, TextToSpeech,
+  Multimedia (FFmpeg plugin), WebSockets, WebEngine (Core, Quick; not loadable, see below),
+  WebView, TextToSpeech,
   Positioning, Sensors, Svg, VirtualKeyboard. TLS plugins: `libqopensslbackend.so`,
   `libqcertonlybackend.so`.
 - It apparently comes with the KDE Plasma desktop mode (plugins for plasma, kwin, discover).
@@ -84,6 +85,13 @@ Checked 2026-10-05; details per requirement in [REQUIREMENTS.md](REQUIREMENTS.md
   depend on it. A program linking WebEngine fails to start ("libavcodec.so.60: cannot open
   shared object file"). Other Qt modules are 6.8.0 (`pacman -Q | grep qt6-`). Qt
   Multimedia's FFmpeg plugin resolves all its libraries (`ldd`, no "not found").
+- **Bundling our own Qt WebEngine failed** (experiment, 2026-10-05; Debian's Qt 6.8.2 incl.
+  WebEngine with its own FFmpeg, 141 MB package): the helper process (`QtWebEngineProcess`,
+  needs the executable bit) only starts without Chromium's sandbox (`--no-sandbox`); without
+  `QTWEBENGINE_RESOURCES_PATH` its child processes find no ICU data ("Invalid file descriptor
+  to ICU data"); with Vulkan the app aborts ("free(): invalid pointer"); with OpenGL the
+  dashboard tab stays empty; in a desktop window the page stays white and Chromium's
+  remote-debugging port never opens. FrameAssistant uses no web engine (D40).
 - **Qt add-on modules must come from the system Qt.** Shipping one fails: they use Qt's private
   API, and QtCore aborts on any version mismatch ("Cannot mix incompatible Qt library").
 - **Not present:** any MQTT library (no `libmosquitto`, no Qt MQTT). FrameAssistant ships
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1f48f40..5892416 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -58,20 +58,14 @@ target_link_libraries(frameassistant_lib PUBLIC Qt6::Core)
 target_compile_options(frameassistant_lib PRIVATE -Wall -Wextra)
 
 # The app: its UI is the QML module "FrameAssistant" (src/qml/).
-# Qt WebEngine shows HA's web UI (DSH-1); on the Frame it comes with the system Qt.
-find_package(Qt6 REQUIRED COMPONENTS WebEngineQuick)
 vrdash_add_dashboard(frameassistant
     OUTPUT_NAME ${VRDASH_EXECUTABLE_NAME}
     QML_URI FrameAssistant
     SOURCES main.cpp Dashboard.h Dashboard.cpp
-    QML_SOURCES ha/HaWebUi.h ha/HaWebUi.cpp
     QML_FILES
         qml/Main.qml
-        qml/Card.qml
-        qml/HaDashboard.qml)
-target_link_libraries(frameassistant PRIVATE frameassistant_lib Qt6::WebEngineQuick)
-# The generated QML type registration includes QML_SOURCES headers by file name.
-target_include_directories(frameassistant PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/ha)
+        qml/Card.qml)
+target_link_libraries(frameassistant PRIVATE frameassistant_lib)
 
 install(FILES ${OPENVR_LIBRARY} DESTINATION ${CMAKE_INSTALL_LIBDIR})
 
diff --git a/src/Dashboard.cpp b/src/Dashboard.cpp
index 7279887..81ade1c 100644
--- a/src/Dashboard.cpp
+++ b/src/Dashboard.cpp
@@ -17,9 +17,6 @@ Dashboard::Dashboard(int& argc, char** argv)
                                   .arg(Config::defaultPath()),
                               QStringLiteral("path"))}) {
   addSurface({.qmlRootType = QStringLiteral("Main")});
-  addSurface({.id = QStringLiteral("dashboard"),
-              .qmlRootType = QStringLiteral("HaDashboard"),
-              .displayName = QStringLiteral("HA Dashboard")});
 }
 
 bool Dashboard::prepare(QString* error) {
@@ -37,5 +34,3 @@ bool Dashboard::prepare(QString* error) {
                     << m_config.deviceName << "(" + m_config.deviceId + ")";
   return true;
 }
-
-void Dashboard::loading() { m_haWebUi.setUrl(m_config.haUrl); }
diff --git a/src/Dashboard.h b/src/Dashboard.h
index 16fede5..10d6eed 100644
--- a/src/Dashboard.h
+++ b/src/Dashboard.h
@@ -2,7 +2,6 @@
 
 #include "app/DashboardApplication.h"
 #include "config/Config.h"
-#include "ha/HaWebUi.h"
 
 // The dashboard app. Its UI is the QML module set up in src/CMakeLists.txt
 // (QML_URI FrameAssistant, files in src/qml/).
@@ -17,10 +16,7 @@ class Dashboard : public DashboardApplication {
  protected:
   // Loads the settings (overlay and desktop mode; docs/DESIGN.md, D22).
   bool prepare(QString* error) override;
-  void loading() override;
 
  private:
   Config m_config;
-  // QML singleton (HaWebUi); a member, so it outlives all QML.
-  HaWebUi m_haWebUi{nullptr};
 };
diff --git a/src/ha/HaWebUi.cpp b/src/ha/HaWebUi.cpp
deleted file mode 100644
index f765ccb..0000000
--- a/src/ha/HaWebUi.cpp
+++ /dev/null
@@ -1,49 +0,0 @@
-#include "ha/HaWebUi.h"
-
-#include <QQmlEngine>
-#include <QQuickWebEngineProfile>
-#include <QStandardPaths>
-
-namespace {
-
-HaWebUi* g_instance = nullptr;
-
-}  // namespace
-
-HaWebUi::HaWebUi(QObject* parent) : QObject(parent) {
-  Q_ASSERT(!g_instance);
-  g_instance = this;
-}
-
-HaWebUi::~HaWebUi() { g_instance = nullptr; }
-
-QQuickWebEngineProfile* HaWebUi::profile() {
-  if (!m_profile) {
-    m_profile = new QQuickWebEngineProfile(this);
-    m_profile->setStorageName(QStringLiteral("frameassistant"));
-    m_profile->setOffTheRecord(false);
-    m_profile->setPersistentStoragePath(storagePath());
-    m_profile->setCachePath(cachePath());
-    m_profile->setPersistentCookiesPolicy(
-        QQuickWebEngineProfile::AllowPersistentCookies);
-  }
-  return m_profile;
-}
-
-QString HaWebUi::storagePath() {
-  return QStandardPaths::writableLocation(QStandardPaths::GenericDataLocation) +
-         QStringLiteral("/frameassistant/webengine");
-}
-
-QString HaWebUi::cachePath() {
-  return QStandardPaths::writableLocation(
-             QStandardPaths::GenericCacheLocation) +
-         QStringLiteral("/frameassistant/webengine");
-}
-
-HaWebUi* HaWebUi::create(QQmlEngine*, QJSEngine*) {
-  Q_ASSERT(g_instance);
-  // Owned by the app, not by the QML engine.
-  QJSEngine::setObjectOwnership(g_instance, QJSEngine::CppOwnership);
-  return g_instance;
-}
diff --git a/src/ha/HaWebUi.h b/src/ha/HaWebUi.h
deleted file mode 100644
index 4cd02eb..0000000
--- a/src/ha/HaWebUi.h
+++ /dev/null
@@ -1,46 +0,0 @@
-#pragma once
-
-#include <QtQml/qqmlregistration.h>
-
-#include <QObject>
-#include <QQuickWebEngineProfile>
-#include <QUrl>
-
-class QJSEngine;
-class QQmlEngine;
-
-// HA's web UI in the "HA Dashboard" tab (DSH-1): the URL from the settings
-// and a persistent WebEngine profile, so the HA login survives restarts
-// (docs/DESIGN.md, D39). A QML singleton owned by the app (Dashboard).
-class HaWebUi : public QObject {
-  Q_OBJECT
-  QML_ELEMENT
-  QML_SINGLETON
-  // Empty: no URL configured (the tab shows a hint).
-  Q_PROPERTY(QUrl url READ url CONSTANT)
-  Q_PROPERTY(QQuickWebEngineProfile* profile READ profile CONSTANT)
-
- public:
-  // Not default-constructible, so QML uses create() instead of making its
-  // own instance.
-  explicit HaWebUi(QObject* parent);
-  ~HaWebUi() override;
-
-  // Call before the QML is loaded.
-  void setUrl(const QUrl& url) { m_url = url; }
-
-  QUrl url() const { return m_url; }
-  // Created on first use: only a tab that shows the web UI needs it.
-  QQuickWebEngineProfile* profile();
-
-  // Where the profile keeps its data (cookies, local storage) and cache.
-  static QString storagePath();
-  static QString cachePath();
-
-  // QML singleton factory: the instance the app created.
-  static HaWebUi* create(QQmlEngine*, QJSEngine*);
-
- private:
-  QUrl m_url;
-  QQuickWebEngineProfile* m_profile = nullptr;
-};
diff --git a/src/main.cpp b/src/main.cpp
index 49fe89d..b2aa26b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,11 +1,6 @@
-#include <QtWebEngineQuick/qtwebenginequickglobal.h>
-
 #include "Dashboard.h"
 
 int main(int argc, char* argv[]) {
-  // Must run before the Qt application object exists (the Dashboard
-  // constructor creates it).
-  QtWebEngineQuick::initialize();
   Dashboard app(argc, argv);
   return app.exec();
 }
diff --git a/src/qml/HaDashboard.qml b/src/qml/HaDashboard.qml
deleted file mode 100644
index 7657ca4..0000000
--- a/src/qml/HaDashboard.qml
+++ /dev/null
@@ -1,40 +0,0 @@
-import QtQuick
-import QtQuick.Controls
-import QtQuick.Controls.Material
-import QtWebEngine
-
-// "HA Dashboard" tab (DSH-1): HA's own web UI at the URL from the settings.
-// Without a URL it shows a hint instead.
-Pane {
-    id: root
-
-    Material.theme: Material.Dark
-    padding: 0
-    font.pixelSize: 24
-
-    Loader {
-        anchors.fill: parent
-        sourceComponent: HaWebUi.url.toString() !== "" ? webUi : hint
-    }
-
-    Component {
-        id: webUi
-
-        WebEngineView {
-            profile: HaWebUi.profile
-            url: HaWebUi.url
-        }
-    }
-
-    Component {
-        id: hint
-
-        Label {
-            padding: 48
-            wrapMode: Text.WordWrap
-            verticalAlignment: Text.AlignVCenter
-            horizontalAlignment: Text.AlignHCenter
-            text: qsTr("No Home Assistant URL configured.\n\nSet \"homeassistant.url\" in the settings file and restart.")
-        }
-    }
-}