companion-app: catch up six days of panel drift before the native build

The phone-app codebase (companion-app/) hadn't been touched since
2026-08-11 - every panel fix and feature since then (HIG audit rounds,
receipt upload, trip editing, Inspektion forecast, ...) existed only in
the HA panel. Found while auditing what's needed for a real iPhone
build; user decision was to port everything now rather than ship a
stale app.

Six real, verified gaps (not blind copies of panel CSS/markup, which
doesn't transfer to the @audi-dash/ui component set):

- Battery voltage cutoff was still 13.2V, not the panel's 12.8V fix.
- Dead wlan_name field (WLAN trip detection was fully removed from the
  backend 2026-08-12) - removed from the adapter and the settings screen
  instead of leaving a form field that silently does nothing.
- No Inspektion forecast - added inspektionPrognose() alongside the
  existing oelwechselPrognose(), sharing a refactored core.
- Arbeitsweg pill used the design-system's "work" variant, which is
  documented as recoloring to red - stopped passing it, same fix as the
  panel.
- Trip creation only took Beginn/Ende/Art; extended with Startort/
  Zielort/Kilometerstand/Distanz via a new shared FahrtFelder.tsx.
- FahrtDetail.tsx was read-only - added an edit mode using the same
  shared fields, backed by a new DataMetricApi.fahrtAktualisieren()
  calling the backend service built earlier this session.

Explicitly checked and found not applicable: price rounding (already
2 decimals here), pull-to-refresh CSS (no native gesture to fix),
the panel's drag/paste receipt dialog (solves a desktop-browser problem
this native app doesn't have - the plain file picker already gets iOS's
native Files integration), and the purely cosmetic panel CSS fixes.

npm install run at the repo root (node_modules was incomplete/stale),
package-lock.json reflects the real dependency tree. Verified with
npm run typecheck (clean), npm run test (95/95, up from 90 - added
interaction tests for the new form and inspektionPrognose), and
npm run build (succeeds).

Co-Authored-By: Claude Opus 5 <[email protected]>

companion-app/src/screens/Einstellungen.tsx

@@ -102,7 +102,7 @@ export function Einstellungen({
             onChange={(e) => aendern({ kennzeichen: e.target.value })}
           />
         </Feld>
-        <Feld label="Tankvolumen" unit="l">
+        <Feld label="Tankvolumen" unit="l" last>
           <input
             className="dm-eingabe"
             inputMode="numeric"
@@ -110,13 +110,6 @@ export function Einstellungen({
             onChange={(e) => aendern({ tankvolumen: Number(e.target.value) || 0 })}
           />
         </Feld>
-        <Feld label="WLAN des Fahrzeugs" last>
-          <input
-            className="dm-eingabe"
-            value={werte.wlanName}
-            onChange={(e) => aendern({ wlanName: e.target.value })}
-          />
-        </Feld>
       </Tile>
 
       <Tile>