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_pt.g.dart

@@ -129,6 +129,7 @@ class _Translations$calendar$pt extends Translations$calendar$en {
 	// Translations
 	@override String get title => 'Este mês';
 	@override String get filterChip => 'Este mês';
+	@override String get selfNote => 'O que anotaste nas tuas variedades.';
 	@override String nothing({required Object month}) => 'Nada anotado para ${month}.';
 }
 
@@ -599,6 +600,7 @@ class _Translations$cropCalendar$pt extends Translations$cropCalendar$en {
 	@override String get flowering => 'Floração';
 	@override String get fruiting => 'Frutificação';
 	@override String get seedHarvest => 'Colheita de semente';
+	@override String get editorHint => 'Anota tu os meses típicos desta variedade na tua zona — são as tuas notas.';
 	@override String get unset => '—';
 }
 
@@ -1319,6 +1321,7 @@ extension on TranslationsPt {
 			'seedSaving.sourcePrefix' => 'Fonte',
 			'calendar.title' => 'Este mês',
 			'calendar.filterChip' => 'Este mês',
+			'calendar.selfNote' => 'O que anotaste nas tuas variedades.',
 			'calendar.nothing' => ({required Object month}) => 'Nada anotado para ${month}.',
 			'app.title' => 'Tanemaki',
 			'bootstrap.failed' => 'O Tanemaki não conseguiu iniciar',
@@ -1562,6 +1565,7 @@ extension on TranslationsPt {
 			'cropCalendar.flowering' => 'Floração',
 			'cropCalendar.fruiting' => 'Frutificação',
 			'cropCalendar.seedHarvest' => 'Colheita de semente',
+			'cropCalendar.editorHint' => 'Anota tu os meses típicos desta variedade na tua zona — são as tuas notas.',
 			'cropCalendar.unset' => '—',
 			'needsReproduction.label' => 'Reproduzir nesta época',
 			'needsReproduction.hint' => 'Cultiva-a antes que a semente acabe',