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_en.g.dart

@@ -187,6 +187,9 @@ class Translations$calendar$en {
 	/// en: 'This month'
 	String get filterChip => 'This month';
 
+	/// en: 'What you've noted in your varieties.'
+	String get selfNote => 'What you\'ve noted in your varieties.';
+
 	/// en: 'Nothing noted for {month}.'
 	String nothing({required Object month}) => 'Nothing noted for ${month}.';
 }
@@ -1113,6 +1116,9 @@ class Translations$cropCalendar$en {
 	/// en: 'Seed harvest'
 	String get seedHarvest => 'Seed harvest';
 
+	/// en: 'Note the months typical for this variety in your area — these are your own notes.'
+	String get editorHint => 'Note the months typical for this variety in your area — these are your own notes.';
+
 	/// en: '—'
 	String get unset => '—';
 }
@@ -2311,6 +2317,7 @@ extension on Translations {
 			'seedSaving.sourcePrefix' => 'Source',
 			'calendar.title' => 'This month',
 			'calendar.filterChip' => 'This month',
+			'calendar.selfNote' => 'What you\'ve noted in your varieties.',
 			'calendar.nothing' => ({required Object month}) => 'Nothing noted for ${month}.',
 			'app.title' => 'Tanemaki',
 			'bootstrap.failed' => 'Tanemaki couldn\'t start',
@@ -2558,6 +2565,7 @@ extension on Translations {
 			'cropCalendar.flowering' => 'Flowering',
 			'cropCalendar.fruiting' => 'Fruiting',
 			'cropCalendar.seedHarvest' => 'Seed harvest',
+			'cropCalendar.editorHint' => 'Note the months typical for this variety in your area — these are your own notes.',
 			'cropCalendar.unset' => '—',
 			'needsReproduction.label' => 'To regrow this season',
 			'needsReproduction.hint' => 'Grow it out before the seed runs out',