Fix broken map rendering, split GPS cleanup, receipt parser and design backlog

Leaflet's stylesheet was appended to document.head, so it never reached the
panel's shadow root: .leaflet-tile{position:absolute} never applied, tiles laid
out as in-flow images (~1040px inside a 190px box) and the marker pane ended up
far below the visible area. That is the real cause of the long-standing
"fragmented Leaflet rendering" finding and of the invisible vehicle pin - every
tile request had actually succeeded. The stylesheet now goes into the shadow
root and is awaited before the map is built.

Also in this round:
- Map tiles are always light (Google-Maps-style), no dark variant at night.
- Vehicle marker uses the real CI poi-car icons (poi-car-l >=34px, poi-car-s
  below), with a white halo so the outline stays readable on tiles.
- Removed the obsolete combined STANDORT_TRACKER field; only the split
  lat/lon sensors remain.
- Receipt upload: widened the try block so base64/save failures surface, and
  the frontend call site now reports a rejected service call.
- Generic receipt parser: total detection is line-based (letter-spaced
  headings, no more matching the SUMME-EUR column header, tax lines excluded),
  address heuristic handles 4-digit postcodes and single-line address blocks,
  and "Preis/L" matches without a spelled-out "Liter".
- Design backlog: red hairline frame on list rows (delete button bled through
  at fractional row heights) and select fields now use the grey background box.

Shell 10-receipt regression suite still passes; all changes verified live in
the audi_ha_test container.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

homeassistant/www/audi-dashboard-ios.css

@@ -140,10 +140,11 @@ main#view{--seitenrand:16px;padding:0 var(--seitenrand) 30px;scroll-behavior:smo
   padding:8px 4px;color:var(--fg2)}
 /* Design-Audit 2026-08-13: ein <select> (z.B. Oelwechsel-Intervall "10.000 km"/
    "1 Jahr") sah wie reiner, nicht editierbarer Text aus, seit hier Rahmen/
-   Flaeche entfernt wurden - anders als bei freien Texteingaben zeigt iOS bei
-   Picker-Feldern wie diesem ueblicherweise die Akzentfarbe statt Fliesstext-
-   Grau als Hinweis "hier gibt es eine Auswahl". */
-.feld select{color:var(--ios-tint)}
+   Flaeche entfernt wurden. Der Hinweis "hier gibt es eine Auswahl" laeuft
+   deshalb ueber dieselbe graue Flaeche wie bei .mitEinheit input (Feld
+   "Pause bis [15] Minuten") - ein Kasten liest sich als bedienbar, waehrend
+   eingefaerbter Text auch bloss Hervorhebung sein koennte. */
+.feld select{background:var(--ios-fill);padding:8px 10px}
 .feld input:focus,.feld select:focus{background:var(--ios-fill);color:var(--fg)}
 .mitEinheit input{background:var(--ios-fill);padding:8px 10px}
 .notiz{background:var(--ios-fill);border:0;border-radius:12px;font-size:16px}