feat(ux): usable amounts, colour-coded category/form chips, currency quick-picks

Four usability passes across the everyday flows:

- Quantity picker: a countable unit (cob/pod/ear…) now defaults to 1 and
  the stepper clamps at a minimum of 1 — you can never store 'a cob' with
  a blank/zero figure. Vibe units (a few) still carry no number.
- Category & form chips are colour-coded (new category_palette.dart): a
  small muted earthy palette maps each botanical family to a STABLE
  tonality (fill + readable ink), and each lot form gets its own tone.
  Applied to the inventory filter bar (now grouped attributes | forms |
  families, separated by a hairline), the list's category headers (a
  matching colour dot), and the lot-form selector.
- Sale currency: quick-pick chips (€ · Ğ1 · hours) fill the field in one
  tap — Ğ1 offered quietly among familiar options, never imposed — while
  free text still takes anything else. New i18n key sale.hours (en/es/pt/ast).

Tests: quantity_picker_test (default-1, clamp, vibe, clear-still-1),
category_palette_test (stable/distinct swatches); overflow guard + the
inventory widget tests stay green.

apps/app_seeds/lib/i18n/ast.i18n.json

@@ -592,6 +592,7 @@
     "amount": "Importe",
     "currency": "Moneda",
     "currencyHint": "€, Ğ1, hores… (opcional)",
+    "hours": "hores",
     "note": "Nota (opcional)",
     "save": "Guardar",
     "delete": "Quitar",

apps/app_seeds/lib/i18n/en.i18n.json

@@ -595,6 +595,7 @@
     "amount": "Amount",
     "currency": "Currency",
     "currencyHint": "€, Ğ1, hours… (optional)",
+    "hours": "hours",
     "note": "Note (optional)",
     "save": "Save",
     "delete": "Remove",

apps/app_seeds/lib/i18n/es.i18n.json

@@ -594,6 +594,7 @@
     "amount": "Importe",
     "currency": "Moneda",
     "currencyHint": "€, Ğ1, horas… (opcional)",
+    "hours": "horas",
     "note": "Nota (opcional)",
     "save": "Guardar",
     "delete": "Quitar",

apps/app_seeds/lib/i18n/pt.i18n.json

@@ -591,6 +591,7 @@
     "amount": "Montante",
     "currency": "Moeda",
     "currencyHint": "€, Ğ1, horas… (opcional)",
+    "hours": "horas",
     "note": "Nota (opcional)",
     "save": "Guardar",
     "delete": "Remover",

apps/app_seeds/lib/i18n/strings.g.dart

@@ -4,9 +4,9 @@
 /// To regenerate, run: `dart run slang`
 ///
 /// Locales: 4
-/// Strings: 1828 (457 per locale)
+/// Strings: 1832 (458 per locale)
 ///
-/// Built on 2026-07-11 at 00:20 UTC
+/// Built on 2026-07-11 at 04:03 UTC
 
 // coverage:ignore-file
 // ignore_for_file: type=lint, unused_import

apps/app_seeds/lib/i18n/strings_ast.g.dart

@@ -860,6 +860,7 @@ class _Translations$sale$ast extends Translations$sale$en {
 	@override String get amount => 'Importe';
 	@override String get currency => 'Moneda';
 	@override String get currencyHint => '€, Ğ1, hores… (opcional)';
+	@override String get hours => 'hores';
 	@override String get note => 'Nota (opcional)';
 	@override String get save => 'Guardar';
 	@override String get delete => 'Quitar';
@@ -1659,6 +1660,7 @@ extension on TranslationsAst {
 			'sale.amount' => 'Importe',
 			'sale.currency' => 'Moneda',
 			'sale.currencyHint' => '€, Ğ1, hores… (opcional)',
+			'sale.hours' => 'hores',
 			'sale.note' => 'Nota (opcional)',
 			'sale.save' => 'Guardar',
 			'sale.delete' => 'Quitar',

apps/app_seeds/lib/i18n/strings_en.g.dart

@@ -1638,6 +1638,9 @@ class Translations$sale$en {
 	/// en: '€, Ğ1, hours… (optional)'
 	String get currencyHint => '€, Ğ1, hours… (optional)';
 
+	/// en: 'hours'
+	String get hours => 'hours';
+
 	/// en: 'Note (optional)'
 	String get note => 'Note (optional)';
 
@@ -2563,6 +2566,7 @@ extension on Translations {
 			'sale.amount' => 'Amount',
 			'sale.currency' => 'Currency',
 			'sale.currencyHint' => '€, Ğ1, hours… (optional)',
+			'sale.hours' => 'hours',
 			'sale.note' => 'Note (optional)',
 			'sale.save' => 'Save',
 			'sale.delete' => 'Remove',

apps/app_seeds/lib/i18n/strings_es.g.dart

@@ -862,6 +862,7 @@ class _Translations$sale$es extends Translations$sale$en {
 	@override String get amount => 'Importe';
 	@override String get currency => 'Moneda';
 	@override String get currencyHint => '€, Ğ1, horas… (opcional)';
+	@override String get hours => 'horas';
 	@override String get note => 'Nota (opcional)';
 	@override String get save => 'Guardar';
 	@override String get delete => 'Quitar';
@@ -1663,6 +1664,7 @@ extension on TranslationsEs {
 			'sale.amount' => 'Importe',
 			'sale.currency' => 'Moneda',
 			'sale.currencyHint' => '€, Ğ1, horas… (opcional)',
+			'sale.hours' => 'horas',
 			'sale.note' => 'Nota (opcional)',
 			'sale.save' => 'Guardar',
 			'sale.delete' => 'Quitar',

apps/app_seeds/lib/i18n/strings_pt.g.dart

@@ -859,6 +859,7 @@ class _Translations$sale$pt extends Translations$sale$en {
 	@override String get amount => 'Montante';
 	@override String get currency => 'Moeda';
 	@override String get currencyHint => '€, Ğ1, horas… (opcional)';
+	@override String get hours => 'horas';
 	@override String get note => 'Nota (opcional)';
 	@override String get save => 'Guardar';
 	@override String get delete => 'Remover';
@@ -1657,6 +1658,7 @@ extension on TranslationsPt {
 			'sale.amount' => 'Montante',
 			'sale.currency' => 'Moeda',
 			'sale.currencyHint' => '€, Ğ1, horas… (opcional)',
+			'sale.hours' => 'horas',
 			'sale.note' => 'Nota (opcional)',
 			'sale.save' => 'Guardar',
 			'sale.delete' => 'Remover',