Phone App: a service card laid out by the car's own columns

The Service history columns became a property of the car two commits ago, and
the phone was left out of it on the grounds that it has no table to arrange.
But the arrangement is not the table's — it belongs to the car, and everyone it
is shared with sees it. A reader who switched Oil off on the web still had it
on every card here, which makes the setting look broken rather than absent.

A card is not a table, so the columns cannot be cells. Consecutive short ones
share a wrapping line, which flows left to right and then down and so keeps the
arrangement intact; the parts, the notes and the file each take a line of their
own. That means the grouping follows the car's order rather than the
catalogue's — move Notes between Km and Next date and the short columns split
around it — which is the part a hand-written card gets wrong by collecting the
short columns first and appending the blocks after them, quietly undoing the
arrangement it was asked to honour. serviceColumnRuns is a function for exactly
that reason: it is the piece worth a test.

The date carries no heading where every other column does. A card list is read
down its dates, and "Date" in front of one says nothing the date doesn't — the
same judgment the server makes by refusing to hide it. It is offered in the
picker anyway, ticked and locked, because a row missing from that list is a row
nothing on this screen can drag; the web drags the column headings themselves,
which on a touch screen is the scroll's gesture. A column that is on but empty
says so ("Notes —") rather than vanishing: it was switched on deliberately, and
a card that silently drops it reads as a record that failed to load.

Changed parts arrives with it. Every part shares the one column — they are a
growing list and a column apiece would widen the web's table without end — and
lib/service_parts.dart is the twin of the web's lib/serviceParts.js, so the
form's checkboxes and the card's chips come from one list and adding a part is
one entry plus its boolean on service_records. The chips keep their own shorter
wording; the form keeps the web's, which is what stops the two apps naming the
same part differently.

Verified: flutter analyze is clean and flutter test passes, 22 tests to 32 —
the new ones cover that the arrangeable set is the hideable one plus the date,
that a field key is not a column key, that adding a part adds no column, the
run grouping, and a widget test of the picker showing the date's is the only
locked checkbox. The screen itself was driven against a throwaway stub API: a
default car renders date, Km, Next date, Next km, chips, notes and file in that
order, and a car hiding km and file with the order [notes, date, nextKm, parts,
km, nextDate] rendered exactly that — notes first, both hidden columns gone, the
short columns split around the chips. updateCarView round-trips both new fields
under the names records.go decodes.

Not verified: the picker's own Save button — the tap landed in the harness but
the request never reached the stub, which reads as the fire-and-forget future
being cut off at teardown, since the same call made directly worked. Drag was
exercised through the reorder callback, not by a finger. Nothing here needs the
API Server to change: both fields already ship, and a phone running against an
older one simply reads empty lists and shows every column.

Two commits needed nothing: the web's masked date box answers <input
type="date"> rendering in the browser's locale, which a picker-only field
cannot have, and the garage card's width answers a badge that wrapped, which
this badge cannot. car.services.next goes, its prose replaced by the columns
that now say it.

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

Phone App/assets/i18n/en.json

@@ -375,6 +375,8 @@
       "fieldsHeading": "Information fields",
       "alwaysOn": "{tab} is always available.",
       "fieldsOrderHint": "Drag the fields on the Information tab to change the order they appear in.",
+      "serviceColumnsHeading": "Service history columns",
+      "columnAlwaysOn": "{column} is always shown.",
       "reorderHint": "Drag a row by its handle to change the order.",
       "tabsReorder": "Tabs",
       "fieldsReorder": "Information fields"
@@ -462,7 +464,6 @@
       "colNotes": "Notes",
       "colFile": "File",
       "confirmDelete": "Delete this service record?",
-      "next": "Next: {date} · {km}",
       "chipOil": "Oil & filter",
       "chipEngineFilter": "Engine air",
       "chipCabinFilter": "Cabin air"