diff --git a/.gitignore b/.gitignore
index a1ff03a..48e324e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,4 @@ panel_key*
 # Wine artifacts (if used for testing)
 .wine-pca/
 ha-config/
+dist/
diff --git a/dev/artifacts/screenshots/2026-05-10/01-overview.png b/dev/artifacts/screenshots/2026-05-10/01-overview.png
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diff --git a/dev/artifacts/screenshots/2026-05-10/03-omni-pca-config.png b/dev/artifacts/screenshots/2026-05-10/03-omni-pca-config.png
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diff --git a/dev/artifacts/screenshots/2026-05-10/04-panel-device.png b/dev/artifacts/screenshots/2026-05-10/04-panel-device.png
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diff --git a/dev/artifacts/screenshots/2026-05-10/05-entities-light.png b/dev/artifacts/screenshots/2026-05-10/05-entities-light.png
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diff --git a/dev/artifacts/screenshots/2026-05-10/05-entities-omni.png b/dev/artifacts/screenshots/2026-05-10/05-entities-omni.png
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diff --git a/dev/artifacts/screenshots/2026-05-10/06-developer-states.png b/dev/artifacts/screenshots/2026-05-10/06-developer-states.png
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diff --git a/dev/docker-compose.yml b/dev/docker-compose.yml
index 47b7e35..2649e63 100644
--- a/dev/docker-compose.yml
+++ b/dev/docker-compose.yml
@@ -19,14 +19,16 @@
 services:
   mock-panel:
     image: ghcr.io/astral-sh/uv:python3.14-bookworm-slim
-    working_dir: /app
+    working_dir: /tmp/mock
     volumes:
-      - ..:/app:ro
-    command: >
-      uv run --project /app
-      python /app/dev/run_mock_panel.py
-      --host 0.0.0.0
-      --port 14369
+      - ../src:/tmp/mock/src:ro
+      - ./run_mock_panel.py:/tmp/mock/run_mock_panel.py:ro
+    environment:
+      PYTHONPATH: /tmp/mock/src
+    command:
+      - sh
+      - -c
+      - "uv pip install --system --quiet cryptography && python /tmp/mock/run_mock_panel.py --host 0.0.0.0 --port 14369"
     ports:
       - "14369:14369"
 
diff --git a/dev/screenshot.py b/dev/screenshot.py
new file mode 100644
index 0000000..43ba96d
--- /dev/null
+++ b/dev/screenshot.py
@@ -0,0 +1,318 @@
+#!/usr/bin/env python3
+"""End-to-end demo: onboard HA, add the omni_pca integration against the
+mock panel, drive playwright through the resulting UI to capture screenshots.
+
+Run inside the project venv:
+    uv run --with playwright --with httpx --with websockets \
+        python dev/screenshot.py [--outdir DIR] [--ha-url URL]
+"""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import json
+import sys
+from datetime import datetime
+from pathlib import Path
+
+import httpx
+from playwright.async_api import async_playwright
+
+DEFAULT_HA_URL = "http://localhost:8123"
+DEFAULT_USERNAME = "demo"
+DEFAULT_PASSWORD = "demo-password-1234"
+PANEL_HOST = "host.docker.internal"
+PANEL_PORT = 14369
+CONTROLLER_KEY = "000102030405060708090a0b0c0d0e0f"
+
+
+async def _complete_onboarding(
+    client: httpx.AsyncClient, headers: dict[str, str], ha_url: str
+) -> None:
+    """POST every remaining onboarding step in turn so HA stops greeting us."""
+    r = await client.get("/api/onboarding")
+    pending = [s["step"] for s in r.json() if not s.get("done")]
+    print(f"  pending onboarding: {pending}")
+
+    if "core_config" in pending:
+        try:
+            r = await client.post("/api/onboarding/core_config", headers=headers)
+            print(f"    core_config -> {r.status_code}")
+        except Exception as e:
+            print(f"    core_config error: {e}")
+    if "analytics" in pending:
+        try:
+            r = await client.post(
+                "/api/onboarding/analytics",
+                headers=headers,
+                json={},
+            )
+            print(f"    analytics -> {r.status_code}")
+        except Exception as e:
+            print(f"    analytics error: {e}")
+    if "integration" in pending:
+        try:
+            r = await client.post(
+                "/api/onboarding/integration",
+                headers=headers,
+                json={"client_id": ha_url, "redirect_uri": ha_url},
+            )
+            print(f"    integration -> {r.status_code}")
+        except Exception as e:
+            print(f"    integration error: {e}")
+
+
+async def _onboard(ha_url: str) -> str:
+    """Run HA's onboarding REST flow if needed. Returns access token.
+
+    HA uses the authorization_code OAuth flow. On first-run, POSTing to
+    /api/onboarding/users returns an auth_code that we exchange for tokens.
+    On subsequent runs, we use a long-lived access token created during
+    the first run (persisted in ha-config/.storage/auth).
+    """
+    async with httpx.AsyncClient(base_url=ha_url, timeout=30.0) as client:
+        r = await client.get("/api/onboarding")
+        steps = r.json()
+        user_step = next((s for s in steps if s["step"] == "user"), None)
+
+        if user_step and not user_step.get("done"):
+            # First-run path: create user, get auth_code, exchange.
+            r = await client.post(
+                "/api/onboarding/users",
+                json={
+                    "client_id": ha_url,
+                    "name": "Demo User",
+                    "username": DEFAULT_USERNAME,
+                    "password": DEFAULT_PASSWORD,
+                    "language": "en",
+                },
+            )
+            r.raise_for_status()
+            auth_code = r.json()["auth_code"]
+            print("  ✓ user created")
+
+            r = await client.post(
+                "/auth/token",
+                data={
+                    "client_id": ha_url,
+                    "grant_type": "authorization_code",
+                    "code": auth_code,
+                },
+            )
+            r.raise_for_status()
+            access_token = r.json()["access_token"]
+
+            # Complete the remaining onboarding steps so we land on the
+            # dashboard rather than the discovery wizard.
+            headers = {"Authorization": f"Bearer {access_token}"}
+            await _complete_onboarding(client, headers, ha_url)
+            return access_token
+
+        # Subsequent-run path: log in via /auth/login_flow.
+        token_file = (
+            Path(__file__).parent / "ha-config" / ".storage" / ".demo_access_token"
+        )
+        if token_file.exists():
+            print("  re-using cached demo access token")
+            return token_file.read_text().strip()
+
+        print("  logging in via /auth/login_flow")
+        r = await client.post(
+            "/auth/login_flow",
+            json={
+                "client_id": ha_url,
+                "handler": ["homeassistant", None],
+                "redirect_uri": ha_url,
+            },
+        )
+        r.raise_for_status()
+        flow_id = r.json()["flow_id"]
+        r = await client.post(
+            f"/auth/login_flow/{flow_id}",
+            json={
+                "client_id": ha_url,
+                "username": DEFAULT_USERNAME,
+                "password": DEFAULT_PASSWORD,
+            },
+        )
+        r.raise_for_status()
+        auth_code = r.json()["result"]
+        r = await client.post(
+            "/auth/token",
+            data={
+                "client_id": ha_url,
+                "grant_type": "authorization_code",
+                "code": auth_code,
+            },
+        )
+        r.raise_for_status()
+        return r.json()["access_token"]
+
+
+async def _add_integration(ha_url: str, token: str) -> None:
+    """Add the omni_pca config entry via the REST config-flow endpoints."""
+    headers = {"Authorization": f"Bearer {token}"}
+    async with httpx.AsyncClient(base_url=ha_url, timeout=30.0) as client:
+        r = await client.get("/api/config/config_entries/entry", headers=headers)
+        r.raise_for_status()
+        for entry in r.json():
+            if entry.get("domain") == "omni_pca":
+                print(f"  integration already configured: {entry['title']}")
+                return
+
+        r = await client.post(
+            "/api/config/config_entries/flow",
+            headers=headers,
+            json={"handler": "omni_pca", "show_advanced_options": False},
+        )
+        r.raise_for_status()
+        flow = r.json()
+        flow_id = flow["flow_id"]
+        print(f"  config flow opened: {flow_id} (step={flow.get('step_id')})")
+
+        r = await client.post(
+            f"/api/config/config_entries/flow/{flow_id}",
+            headers=headers,
+            json={
+                "host": PANEL_HOST,
+                "port": PANEL_PORT,
+                "controller_key": CONTROLLER_KEY,
+            },
+        )
+        r.raise_for_status()
+        result = r.json()
+        if result.get("type") == "create_entry":
+            print(f"  ✓ entry created: {result.get('title')}")
+        else:
+            raise RuntimeError(f"unexpected flow outcome: {result}")
+
+
+async def _take_screenshots(ha_url: str, token: str, outdir: Path) -> list[Path]:
+    """Drive playwright through a few interesting pages."""
+    outdir.mkdir(parents=True, exist_ok=True)
+    shots: list[Path] = []
+
+    async with async_playwright() as p:
+        browser = await p.chromium.launch(headless=True)
+        context = await browser.new_context(
+            viewport={"width": 1440, "height": 900},
+            device_scale_factor=2,
+        )
+        # Inject auth so we skip the login screen.
+        await context.add_init_script(
+            f"""window.localStorage.setItem('hassTokens', JSON.stringify({{
+                access_token: '{token}',
+                token_type: 'Bearer',
+                expires_in: 1800,
+                hassUrl: '{ha_url}',
+                clientId: '{ha_url}',
+                expires: Date.now() + 1800000,
+                refresh_token: 'placeholder',
+            }}));
+            window.localStorage.setItem('selectedLanguage', '"en"');
+            """
+        )
+        page = await context.new_page()
+
+        async def shot(filename: str, url: str, *, wait_for: str | None = None,
+                       wait_secs: float = 4.0) -> None:
+            print(f"  → {filename}  ({url})")
+            try:
+                await page.goto(f"{ha_url}{url}", wait_until="networkidle",
+                                timeout=30000)
+            except Exception as e:
+                print(f"    nav warning: {e}")
+            if wait_for:
+                try:
+                    await page.locator(wait_for).first.wait_for(timeout=10000)
+                except Exception:
+                    pass
+            await page.wait_for_timeout(int(wait_secs * 1000))
+            path = outdir / filename
+            await page.screenshot(path=str(path), full_page=False)
+            shots.append(path)
+
+        # Make sure onboarding is fully complete before we screenshot anything.
+        async with httpx.AsyncClient(base_url=ha_url, timeout=15.0) as client:
+            await _complete_onboarding(
+                client, {"Authorization": f"Bearer {token}"}, ha_url
+            )
+
+        # Look up the panel device id so we can deep-link to its page.
+        device_id: str | None = None
+        async with httpx.AsyncClient(base_url=ha_url, timeout=15.0) as client:
+            r = await client.post(
+                "/api/template",
+                headers={"Authorization": f"Bearer {token}"},
+                json={"template": "{{ device_id('sensor.omni_pro_ii_panel_model') }}"},
+            )
+            if r.status_code == 200:
+                device_id = (r.text or "").strip().strip('"')
+                if device_id and device_id != "None":
+                    print(f"  panel device_id: {device_id}")
+                else:
+                    device_id = None
+
+        await shot("01-overview.png", "/lovelace/0", wait_secs=5.0)
+        await shot("02-integrations-list.png",
+                   "/config/integrations/dashboard", wait_secs=4.0)
+        await shot("03-omni-pca-config.png",
+                   "/config/integrations/integration/omni_pca", wait_secs=4.0)
+        if device_id:
+            await shot("04-panel-device.png",
+                       f"/config/devices/device/{device_id}", wait_secs=4.0)
+        await shot(
+            "05-entities-omni.png",
+            '/config/entities?config_entry=' + 'omni_pca',
+            wait_secs=4.0,
+        )
+        await shot("06-developer-states.png",
+                   "/developer-tools/state", wait_secs=4.0)
+
+        await browser.close()
+    return shots
+
+
+async def amain(args: argparse.Namespace) -> int:
+    print("[1/3] HA onboarding...")
+    token = await _onboard(args.ha_url)
+    # Cache token so subsequent runs against an already-onboarded HA can reuse.
+    token_file = (
+        Path(__file__).parent / "ha-config" / ".storage" / ".demo_access_token"
+    )
+    try:
+        token_file.parent.mkdir(parents=True, exist_ok=True)
+        token_file.write_text(token)
+    except Exception:
+        pass
+
+    print("[2/3] adding omni_pca integration...")
+    await _add_integration(args.ha_url, token)
+    # Give HA a moment to discover all entities.
+    await asyncio.sleep(8)
+    print("[3/3] capturing screenshots...")
+    shots = await _take_screenshots(args.ha_url, token, args.outdir)
+    print(f"\n✓ wrote {len(shots)} screenshots to {args.outdir}")
+    for p in shots:
+        print(f"   {p}")
+    return 0
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--ha-url", default=DEFAULT_HA_URL)
+    parser.add_argument(
+        "--outdir",
+        type=Path,
+        default=Path(__file__).parent
+        / "artifacts"
+        / "screenshots"
+        / datetime.now().strftime("%Y-%m-%d"),
+    )
+    args = parser.parse_args()
+    return asyncio.run(amain(args))
+
+
+if __name__ == "__main__":
+    sys.exit(main())