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/test/ui/seed_saving_section_test.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:tane/data/seed_saving_catalog.dart';
 import 'package:tane/db/database.dart';
@@ -36,7 +37,14 @@ void main() {
   testWidgets('shows the seed-saving section for a known family', (tester) async {
     await pumpDetailFor(tester, 'Solanaceae');
 
+    // The section is a collapsed expander — its title shows, its body doesn't
+    // until opened.
     expect(find.text('Saving its seed'), findsOneWidget);
+    expect(find.textContaining('Self-pollinating'), findsNothing);
+
+    await tester.tap(find.byKey(const Key('detail.seedSaving')));
+    await tester.pumpAndSettle();
+
     // The pollination line is a Text.rich (label + value), so match the run.
     expect(find.textContaining('Self-pollinating'), findsOneWidget);
     expect(find.text('Easy'), findsOneWidget); // the difficulty pill

apps/app_seeds/test/ui/share_flow_test.dart

@@ -47,40 +47,6 @@ void main() {
     await disposeTree(tester);
   });
 
-  testWidgets('declaring plenty reveals the share choice with a nudge', (
-    tester,
-  ) async {
-    final repo = newTestRepository(db);
-    final id = await repo.addQuickVariety(label: 'Maize');
-
-    await tester.pumpWidget(
-      wrapDetail(
-        repository: repo,
-        varietyId: id,
-        species: newTestSpeciesRepository(db),
-      ),
-    );
-    await tester.pumpAndSettle();
-
-    await tester.tap(find.byKey(const Key('detail.addLot')));
-    await tester.pumpAndSettle();
-
-    // Reveal abundance and declare plenty.
-    await tester.ensureVisible(find.byKey(const Key('lot.addAbundance')));
-    await tester.tap(find.byKey(const Key('lot.addAbundance')));
-    await tester.pumpAndSettle();
-    await tester.ensureVisible(
-      find.byKey(const Key('abundance.plentyToShare')),
-    );
-    await tester.tap(find.byKey(const Key('abundance.plentyToShare')));
-    await tester.pumpAndSettle();
-
-    // The share section reveals itself, still private, with a soft nudge.
-    expect(find.byKey(const Key('share.private')), findsOneWidget);
-    expect(find.byKey(const Key('share.nudge')), findsOneWidget);
-    await disposeTree(tester);
-  });
-
   testWidgets('the sharing filter narrows the list to what I share', (
     tester,
   ) async {