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/daten/service.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest"
 
-import { letzterOelwechsel, oelwechselPrognose } from "./service"
+import { inspektionPrognose, letzterOelwechsel, oelwechselPrognose } from "./service"
 import type { Fahrzeug } from "./profilAdapter"
 
 function fahrzeug(odo: number, modus = "hersteller"): Fahrzeug {
@@ -92,3 +92,23 @@ describe("oelwechselPrognose", () => {
     expect(oelwechselPrognose(fahrzeug(46000), [], jetzt)).toBeNull()
   })
 })
+
+describe("inspektionPrognose", () => {
+  const jetzt = new Date("2026-08-11T12:00:00")
+
+  it("rechnet mit dem festen Intervall 30.000 km / 24 Monate, nicht dem Ölwechsel-Intervall", () => {
+    // Letzte Inspektion 05.03.2025 bei 25000 km -> Ziel 55000. Bei 46000 km
+    // sind das 9000 km offen, unabhängig vom oel-Feld des Fahrzeugs (15000/12).
+    const p = inspektionPrognose(fahrzeug(46000), BUCH, jetzt)
+    expect(p).not.toBeNull()
+    expect(p!.restKm).toBe(9000)
+  })
+
+  it("ignoriert den Ölwechsel-Eintrag bei der Suche nach der letzten Inspektion", () => {
+    expect(inspektionPrognose(fahrzeug(46000), [BUCH[0]!], jetzt)).toBeNull()
+  })
+
+  it("liefert nichts, wenn nie eine Inspektion eingetragen wurde", () => {
+    expect(inspektionPrognose(fahrzeug(46000), [], jetzt)).toBeNull()
+  })
+})