polish(detail): TODO review — calendar intro, drop abundance, collapse seed-saving

From the owner's TODO.org review of the shipped features:
- Crop calendar now says the months are YOUR notes: a hint line in the
  editor (cropCalendar.editorHint) and a caption under the 'this month'
  screen (calendar.selfNote) — it read as if the app knew when to sow.
- Dropped the 'how much I have' (abundance) input + display: it competed
  with the lot quantity as a second 'how much'. Removed from the lot sheet
  and the lot summary; the DB column + backup/CSV/catalog plumbing stay
  dormant (no destructive migration). offer_status carries 'do I share'.
- Seed-saving guidance moved into a collapsed expander (detail.seedSaving)
  — reference facts about the species shouldn't sit open among the
  grower's own records; opt-in depth, per progressive disclosure.
- Condition checks already live behind the collapsed 'advanced' expander
  (seed lots only) — left as the discreet power-user surface.

Tests: dropped the obsolete abundance→share nudge test; the seed-saving
section test now expands before asserting. analyze clean; suites green.

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

@@ -129,6 +129,7 @@ class _Translations$calendar$es extends Translations$calendar$en {
 	// Translations
 	@override String get title => 'Este mes';
 	@override String get filterChip => 'Este mes';
+	@override String get selfNote => 'Lo que has anotado en tus variedades.';
 	@override String nothing({required Object month}) => 'Nada anotado para ${month}.';
 }
 
@@ -602,6 +603,7 @@ class _Translations$cropCalendar$es extends Translations$cropCalendar$en {
 	@override String get flowering => 'Floración';
 	@override String get fruiting => 'Fructificación';
 	@override String get seedHarvest => 'Cosecha de semilla';
+	@override String get editorHint => 'Anota tú los meses típicos de esta variedad en tu zona — son tus propias notas.';
 	@override String get unset => '—';
 }
 
@@ -1322,6 +1324,7 @@ extension on TranslationsEs {
 			'seedSaving.sourcePrefix' => 'Fuente',
 			'calendar.title' => 'Este mes',
 			'calendar.filterChip' => 'Este mes',
+			'calendar.selfNote' => 'Lo que has anotado en tus variedades.',
 			'calendar.nothing' => ({required Object month}) => 'Nada anotado para ${month}.',
 			'app.title' => 'Tanemaki',
 			'bootstrap.failed' => 'Tanemaki no pudo arrancar',
@@ -1568,6 +1571,7 @@ extension on TranslationsEs {
 			'cropCalendar.flowering' => 'Floración',
 			'cropCalendar.fruiting' => 'Fructificación',
 			'cropCalendar.seedHarvest' => 'Cosecha de semilla',
+			'cropCalendar.editorHint' => 'Anota tú los meses típicos de esta variedad en tu zona — son tus propias notas.',
 			'cropCalendar.unset' => '—',
 			'needsReproduction.label' => 'Reproducir esta temporada',
 			'needsReproduction.hint' => 'Cultívala antes de que se acabe la semilla',