UX-13 P5: Dutch text, STYLE check, DOCS screenshots, period editor

- app/ui_text/nl.json and app/uitext.py: every page word in Dutch, English
  fallback per key; the page picks by browser language. Home's sentences
  move into ui_text `home_words`, so /status?lang=nl builds them in Dutch.
- test_ui_text.py: EN/NL key and placeholder parity, STYLE limits, jargon
  lists for both languages, no inline details, untranslated Dutch caught.
  Shared rules moved unchanged to tools/style_rules.py.
- tools/ux13_screenshots.sh/.py: DOCS screenshots from the demo fixtures in
  headless Chromium; docs/img/ux13/. Battery modes (P3): no screenshot.
- "Other time windows": a list editor (ui.periods) that builds
  static_profile and names bad times, empty prices, overlaps and gaps.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

goodwe_controller/tools/ux13_demo.py

@@ -1,7 +1,8 @@
 """UX-13: serve the real page and routes over a fixture controller, for a
 headless browser check.  `python3 tools/ux13_demo.py STATE PORT [HOST]`
 
-STATE is running, shadow or alarm. The controller is the shipped `Controller`
+STATE is running, shadow, alarm, new (P4) or setup (UX-15's setup-only
+mode, P5). The controller is the shipped `Controller`
 with its readings set by hand (two batteries, solar, today's prices in the
 mockup's shape, trading on). Nothing here talks to Home Assistant or to an
 inverter: `/action` changes only this fixture. Used for the P1 render check
@@ -35,6 +36,7 @@ from aiohttp import web as aioweb                                # noqa: E402
 
 from app import homeview, web                                    # noqa: E402
 from app.main import Controller                                  # noqa: E402
+from app.setuponly import SetupOnly                              # noqa: E402
 from app.peakguard import PeakDecision                           # noqa: E402
 from app.price import PricePoint, PriceProduct, PriceRead        # noqa: E402
 from app.static_tariff import TariffPlan                         # noqa: E402
@@ -203,8 +205,9 @@ class Supervisor:
     async def info(self):
         return {"options": json.loads(json.dumps(self.options)),
                 "schema": schema_ui(CONFIG),
-                "translations": {"en": TL.parse_translation_file(
-                    os.path.join(HERE, "translations", "en.yaml"))}}
+                "translations": {lang: TL.parse_translation_file(
+                    os.path.join(HERE, "translations", f"{lang}.yaml"))
+                    for lang in ("en", "nl")}}
 
     async def write_options(self, options):
         self.options = json.loads(json.dumps(options))
@@ -255,7 +258,20 @@ def controller(state):
     return c
 
 
+class ReadOnlyHass(Hass):
+    read_only = True        # app/setuponly.py serves only on a read-only HA
+
+
 async def main(state, port, host="127.0.0.1"):
+    if state == "setup":
+        # UX-15's setup-only mode: shipped defaults, nothing controlled.
+        stored = defaults(CONFIG)
+        c = SetupOnly(dict(stored), ReadOnlyHass(), Store())
+        runner = aioweb.AppRunner(web.build_app(c, Supervisor(stored)))
+        await runner.setup()
+        await aioweb.TCPSite(runner, host, port).start()
+        print(f"serving setup on http://127.0.0.1:{port}/", flush=True)
+        await asyncio.Event().wait()
     if state == "new":
         stored = dict(defaults(CONFIG), setpoint_entity="number.a")
         store = Store()