diff --git a/AGENTS.md b/AGENTS.md
index 4d2f77a..bb0ca76 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -202,17 +202,36 @@ capacitor/iframe/browser (`umgebung.ts`), types + entity table (`types.ts`), fac
       validity; Mosquitto configured (`certfile`/`keyfile`/`cafile`/`require_certificate: true`).
       Remaining: upload root/client cert/key to the FMM003 Security tab — filenames must end in
       `.pem`/`.pem.crt`/`.pem.key` (Configurator rejects plain `.crt`/`.key`, content-agnostic check)
-- [x] Decide broker reachability for the vehicle — port-forward 8883 (not VPS bridge), decided
-      2026-08-11; DuckDNS hostname `datametric360.duckdns.org` set up and reliably updating,
-      port-forward 8883 done on the Speedport Smart 4 Plus, FMM003 confirmed sending data. Let's
-      Encrypt for HA's own local UI is now working too (root cause of the earlier DNS-01 failures
-      was a stray `aliases` entry in the DuckDNS add-on config, not DNS/network — see
-      COMPANION_APP_ARCHITECTURE.md §5 item 2a for the full writeup). HA's SSL config now lives in
+- [ ] Decide broker reachability for the vehicle — **reopened 2026-08-11 evening**: port-forward
+      8883 on the Speedport Smart 4 Plus looked correctly configured (rule present, right internal
+      IP, right port) and internal reachability was confirmed (`homeassistant.local:8883` open from
+      the LAN, Mosquitto TLS listener genuinely up, TLS cert chain end-to-end verified byte-for-byte
+      against the FMM003's uploaded client cert), but the port stayed **closed from outside**
+      (confirmed via external port checker, both before and after a router reboot that changed the
+      dynamic WAN IP — DNS/DuckDNS matched correctly each time, so not a DNS or CGNAT issue).
+      Community reports (ComputerBase, Telekom Hilft) describe this as a known, Telekom-acknowledged
+      firmware bug on this router model; a full disable-the-firewall workaround doesn't exist on this
+      model either. Port-forward rule has been removed again. **New direction: route the FMM003
+      through flespi instead** (native Teltonika/Codec8 channel, IMEI-based auth, no certs, no
+      inbound port needed at all — flespi has a stable public endpoint; HA pulls data back out via
+      flespi's REST API or MQTT, outbound-only). Free flespi tier (10 devices/2 channels) is enough
+      for one vehicle. Next step: user creates the flespi account + Teltonika channel; a `flespi`
+      custom integration is already present in this HA instance (unconfigured) — check what it
+      needs once flespi-side setup exists.
+      Unrelated but still valid from the same session: DuckDNS hostname
+      `datametric360.duckdns.org` reliably updating; Let's Encrypt for HA's own local UI works (root
+      cause of the earlier DNS-01 failures was a stray `aliases` entry in the DuckDNS add-on config,
+      not DNS/network — see COMPANION_APP_ARCHITECTURE.md §5 item 2a). HA's SSL config now lives in
       Settings → System → Network (UI), not `configuration.yaml`'s old `http:` block, which was
-      removed after HA started migrating/ignoring it.
-- [ ] MQTT Client Type on the FMM003: "Custom server" (value 3, seen in Configurator help text) was
-      not selectable in practice — use **"AWS IoT Custom"** pointed at the own broker instead
-      (confirmed working by two independent community reports); verify once the device is live
+      removed after HA started migrating/ignoring it. The Mosquitto TLS setup itself (cert chain,
+      `require_certificate: true`, `certfile`/`keyfile`/`cafile`) is verified correct and can be
+      reused as-is if a self-hosted broker is ever revisited.
+- [ ] MQTT Client Type on the FMM003 ("Custom server" not selectable in practice, "AWS IoT Custom"
+      pointed at a self-hosted broker was confirmed working by two independent community reports) —
+      **moot for now** given the flespi pivot above: flespi uses the device's native Codec8/TCP
+      channel, not MQTT at all, so Server Settings should switch to Protocol: TCP against the flespi
+      channel host/port instead, and Codec set to "Codec 8 Extended". Revisit this item only if a
+      self-hosted broker is picked back up later.
 - [ ] Capture the first real Codec JSON message (`mosquitto_sub`/MQTT Explorer) and build the
       field mapping from it — **do not guess beforehand** (explicit decision)
 - [ ] Move trip detection to FMM003 ignition (reuse the `fahrterkennung.py` pattern, keep pause
@@ -220,6 +239,20 @@ capacitor/iframe/browser (`umgebung.ts`), types + entity table (`types.ts`), fac
 
 ### C) Maintain the existing HA panel (low priority — being replaced)
 
+- [x] Wide-screen/desktop layout (`@container (min-width:860px)` in `audi-dashboard-ios.css`,
+      turns the same `.tabbar` into a 264px side-nav via CSS only, no JS/markup duplication) — done
+      2026-08-11 from the Claude Design "DataMetric360 Board" draft (`claude.ai/design` project
+      `c28a8d4d-ec4e-4178-9e49-ab5b90c02097`). Found and fixed a real regression while verifying it
+      live in `audi_ha_test`: the overlay's `:host > div{height:100%}` (meant to drop the old
+      412px-cap for the sidebar layout) was applied unconditionally instead of only inside the
+      `@container` block, which broke the **normal mobile layout too** — HA doesn't reliably
+      propagate a real height down through `panel_custom`, so `height:100%` collapsed `main#view` to
+      ~0px (tabbar rendered right under the header, content invisible). Fix: kept the outer wrapper
+      viewport-anchored (`min(880px, calc(100dvh - 24px))`, matching `audi-dashboard.css`'s original
+      reasoning) at all widths, and only drop the 880px cap (`calc(100dvh - 24px)`, still
+      viewport-anchored, not parent-relative) inside `@container (min-width:860px)`. Verified live at
+      both narrow (mobile tab bar, full content) and wide (1144px container, grid side-nav,
+      navigation clicks, settings back-arrow) — screenshots taken, no regressions found.
 - [ ] Fix documentation drift (statistics claim, INSTALL variable names, README gaps, obsolete
       TODO comment) — text-only changes
 - [ ] Harden `profil_lesen()` against missing/corrupt `fahrzeugprofil.json`
diff --git a/homeassistant/www/audi-dashboard-ios.css b/homeassistant/www/audi-dashboard-ios.css
index 50fdb45..a80cb80 100644
--- a/homeassistant/www/audi-dashboard-ios.css
+++ b/homeassistant/www/audi-dashboard-ios.css
@@ -47,8 +47,15 @@ html,body{height:100%}
    gedacht) wird hier unbedingt aufgehoben, nicht nur ab 860px: auf
    schmalen Bildschirmen macht der Viewport selbst die Breite eng genug,
    :host-Selektoren innerhalb @container werden von diesem Browser aber
-   offenbar verworfen - deshalb unbedingt statt bedingt. */
-:host > div{height:100%;max-width:none}
+   offenbar verworfen - deshalb unbedingt statt bedingt.
+   Die Hoehe bleibt dagegen viewport-verankert (100dvh statt 100%): das ist
+   der Grund, warum audi-dashboard.css das ueberhaupt so baute - HA gibt der
+   panel_custom-Kette keine verlaessliche Hoehe weiter, height:100% liess den
+   Hauptinhalt hier auf 0px kollabieren (Tabbar direkt unter dem Header,
+   main#view unsichtbar). Erst ab 860px (siehe @container unten) darf die
+   880px-Deckelung fallen, damit die App auf grossen Bildschirmen mehr als
+   eine schwebende Telefonkarte ist. */
+:host > div{height:min(880px, calc(100dvh - 24px));max-width:none}
 .phone{width:100%;max-width:none;height:100%;border-radius:0;
   font-family:"Audi Type",Helvetica,Arial,sans-serif;
   -webkit-font-smoothing:antialiased;letter-spacing:0}
@@ -174,6 +181,9 @@ main{padding:0 16px 30px;scroll-behavior:smooth}
    eigenen Rahmen sitzt und nicht die Fensterbreite messen darf. Schwelle 860 px.
    ================================================================== */
 @container (min-width:860px){
+  /* Ab hier keine schwebende Telefonkarte mehr - die 880px-Deckelung faellt,
+     die App fuellt die tatsaechliche (weiterhin viewport-verankerte) Hoehe. */
+  :host > div{height:calc(100dvh - 24px)}
   .phone{display:grid;grid-template-columns:264px minmax(0,1fr);
     grid-template-rows:auto auto minmax(0,1fr)}
   .topbar{grid-column:2;grid-row:1;padding:38px 44px 8px}
diff --git a/homeassistant/www/audi-dashboard-version.json b/homeassistant/www/audi-dashboard-version.json
index 9c94edd..9f03e94 100644
--- a/homeassistant/www/audi-dashboard-version.json
+++ b/homeassistant/www/audi-dashboard-version.json
@@ -1 +1 @@
-{"version": 1786377887}
+{"version": 1786473562}