feat(seed-saving): source attribution + advisory note

Record where the guidance comes from (copyright/attribution) and make
clear it is general, not local gospel — kept light:
- seed_saving.json gains a top-level sources list (Seed to Seed / Seed
  Savers Exchange / Organic Seed Alliance); parsed into
  SeedSavingData.sources, exposed via SeedSavingCatalog.sources.
- The detail section shows a small muted footer: an italic 'advisory —
  adapt to your climate' line plus a 'Source: …' credit.
- i18n seedSaving.advisory + sourcePrefix (en/es/pt/ast).
- Tests: asset carries sources; the section renders advisory + credit.

apps/app_seeds/lib/data/seed_saving_catalog.dart

@@ -29,4 +29,7 @@ class SeedSavingCatalog {
   /// matches. See [SeedSavingData.guideFor].
   static SeedSavingGuide? guideFor({String? scientificName, String? family}) =>
       data?.guideFor(scientificName: scientificName, family: family);
+
+  /// The attributions for the guidance (empty before load).
+  static List<SeedSavingSource> get sources => data?.sources ?? const [];
 }

apps/app_seeds/lib/domain/seed_saving.dart

@@ -86,12 +86,21 @@ class SeedSavingGuide {
   }
 }
 
+/// An attribution for the bundled guidance (the facts are drawn from these).
+class SeedSavingSource {
+  const SeedSavingSource({required this.title, this.author, this.url});
+  final String title;
+  final String? author;
+  final String? url;
+}
+
 /// The whole bundled dataset: family defaults plus per-taxon overrides (keyed by
 /// scientific name OR bare genus). Lookups are case-insensitive.
 class SeedSavingData {
   SeedSavingData({
     required Map<String, SeedSavingGuide> families,
     required Map<String, SeedSavingGuide> taxa,
+    this.sources = const [],
   })  : _families = {
           for (final e in families.entries) e.key.toLowerCase().trim(): e.value,
         },
@@ -102,6 +111,9 @@ class SeedSavingData {
   final Map<String, SeedSavingGuide> _families;
   final Map<String, SeedSavingGuide> _taxa;
 
+  /// Where the guidance comes from — shown as a small credit under the section.
+  final List<SeedSavingSource> sources;
+
   /// The best guide for a crop: the family default, overlaid by a per-species
   /// (or per-genus) entry when one exists. Returns null when nothing matches.
   SeedSavingGuide? guideFor({String? scientificName, String? family}) {
@@ -151,5 +163,18 @@ SeedSavingData parseSeedSaving(String jsonString) {
     );
   }
 
-  return SeedSavingData(families: section('families'), taxa: section('species'));
+  final sources = [
+    for (final s in (root['sources'] as List? ?? const []).cast<Map>())
+      SeedSavingSource(
+        title: s['title'] as String,
+        author: s['author'] as String?,
+        url: s['url'] as String?,
+      ),
+  ];
+
+  return SeedSavingData(
+    families: section('families'),
+    taxa: section('species'),
+    sources: sources,
+  );
 }

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

@@ -23,7 +23,9 @@
     "difficulty": "Dificultá",
     "diffEasy": "Fácil",
     "diffMedium": "Media",
-    "diffHard": "Difícil"
+    "diffHard": "Difícil",
+    "advisory": "Orientativu — afaílu al to clima y variedá.",
+    "sourcePrefix": "Fonte"
   },
   "calendar": {
     "title": "Esti mes",

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

@@ -23,7 +23,9 @@
     "difficulty": "Difficulty",
     "diffEasy": "Easy",
     "diffMedium": "Medium",
-    "diffHard": "Hard"
+    "diffHard": "Hard",
+    "advisory": "General guidance — adapt it to your climate and variety.",
+    "sourcePrefix": "Source"
   },
   "calendar": {
     "title": "This month",

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

@@ -23,7 +23,9 @@
     "difficulty": "Dificultad",
     "diffEasy": "Fácil",
     "diffMedium": "Media",
-    "diffHard": "Difícil"
+    "diffHard": "Difícil",
+    "advisory": "Orientativo — adáptalo a tu clima y variedad.",
+    "sourcePrefix": "Fuente"
   },
   "calendar": {
     "title": "Este mes",

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

@@ -23,7 +23,9 @@
     "difficulty": "Dificuldade",
     "diffEasy": "Fácil",
     "diffMedium": "Média",
-    "diffHard": "Difícil"
+    "diffHard": "Difícil",
+    "advisory": "Orientativo — adapte-o ao seu clima e variedade.",
+    "sourcePrefix": "Fonte"
   },
   "calendar": {
     "title": "Este mês",

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

@@ -4,9 +4,9 @@
 /// To regenerate, run: `dart run slang`
 ///
 /// Locales: 4
-/// Strings: 1960 (490 per locale)
+/// Strings: 1968 (492 per locale)
 ///
-/// Built on 2026-07-11 at 05:18 UTC
+/// Built on 2026-07-11 at 05:50 UTC
 
 // coverage:ignore-file
 // ignore_for_file: type=lint, unused_import

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

@@ -114,6 +114,8 @@ class _Translations$seedSaving$ast extends Translations$seedSaving$en {
 	@override String get diffEasy => 'Fácil';
 	@override String get diffMedium => 'Media';
 	@override String get diffHard => 'Difícil';
+	@override String get advisory => 'Orientativu — afaílu al to clima y variedá.';
+	@override String get sourcePrefix => 'Fonte';
 }
 
 // Path: calendar
@@ -1284,6 +1286,8 @@ extension on TranslationsAst {
 			'seedSaving.diffEasy' => 'Fácil',
 			'seedSaving.diffMedium' => 'Media',
 			'seedSaving.diffHard' => 'Difícil',
+			'seedSaving.advisory' => 'Orientativu — afaílu al to clima y variedá.',
+			'seedSaving.sourcePrefix' => 'Fonte',
 			'calendar.title' => 'Esti mes',
 			'calendar.filterChip' => 'Esti mes',
 			'calendar.nothing' => ({required Object month}) => 'Nada anotao pa ${month}.',

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

@@ -163,6 +163,12 @@ class Translations$seedSaving$en {
 
 	/// en: 'Hard'
 	String get diffHard => 'Hard';
+
+	/// en: 'General guidance — adapt it to your climate and variety.'
+	String get advisory => 'General guidance — adapt it to your climate and variety.';
+
+	/// en: 'Source'
+	String get sourcePrefix => 'Source';
 }
 
 // Path: calendar
@@ -2251,6 +2257,8 @@ extension on Translations {
 			'seedSaving.diffEasy' => 'Easy',
 			'seedSaving.diffMedium' => 'Medium',
 			'seedSaving.diffHard' => 'Hard',
+			'seedSaving.advisory' => 'General guidance — adapt it to your climate and variety.',
+			'seedSaving.sourcePrefix' => 'Source',
 			'calendar.title' => 'This month',
 			'calendar.filterChip' => 'This month',
 			'calendar.nothing' => ({required Object month}) => 'Nothing noted for ${month}.',

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

@@ -114,6 +114,8 @@ class _Translations$seedSaving$es extends Translations$seedSaving$en {
 	@override String get diffEasy => 'Fácil';
 	@override String get diffMedium => 'Media';
 	@override String get diffHard => 'Difícil';
+	@override String get advisory => 'Orientativo — adáptalo a tu clima y variedad.';
+	@override String get sourcePrefix => 'Fuente';
 }
 
 // Path: calendar
@@ -1286,6 +1288,8 @@ extension on TranslationsEs {
 			'seedSaving.diffEasy' => 'Fácil',
 			'seedSaving.diffMedium' => 'Media',
 			'seedSaving.diffHard' => 'Difícil',
+			'seedSaving.advisory' => 'Orientativo — adáptalo a tu clima y variedad.',
+			'seedSaving.sourcePrefix' => 'Fuente',
 			'calendar.title' => 'Este mes',
 			'calendar.filterChip' => 'Este mes',
 			'calendar.nothing' => ({required Object month}) => 'Nada anotado para ${month}.',

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

@@ -114,6 +114,8 @@ class _Translations$seedSaving$pt extends Translations$seedSaving$en {
 	@override String get diffEasy => 'Fácil';
 	@override String get diffMedium => 'Média';
 	@override String get diffHard => 'Difícil';
+	@override String get advisory => 'Orientativo — adapte-o ao seu clima e variedade.';
+	@override String get sourcePrefix => 'Fonte';
 }
 
 // Path: calendar
@@ -1283,6 +1285,8 @@ extension on TranslationsPt {
 			'seedSaving.diffEasy' => 'Fácil',
 			'seedSaving.diffMedium' => 'Média',
 			'seedSaving.diffHard' => 'Difícil',
+			'seedSaving.advisory' => 'Orientativo — adapte-o ao seu clima e variedade.',
+			'seedSaving.sourcePrefix' => 'Fonte',
 			'calendar.title' => 'Este mês',
 			'calendar.filterChip' => 'Este mês',
 			'calendar.nothing' => ({required Object month}) => 'Nada anotado para ${month}.',

apps/app_seeds/lib/ui/variety_detail_screen.dart

@@ -1097,6 +1097,21 @@ class _SeedSavingView extends StatelessWidget {
           const SizedBox(height: 8),
           Text(note, style: const TextStyle(color: seedMuted, height: 1.35)),
         ],
+        // Advisory + a light source credit — the figures are general, not local
+        // gospel, and drawn from the seed-saving literature.
+        const SizedBox(height: 10),
+        Text(t.seedSaving.advisory,
+            style: const TextStyle(
+                color: seedMuted, fontSize: 12, fontStyle: FontStyle.italic)),
+        if (SeedSavingCatalog.sources case final sources when sources.isNotEmpty)
+          Padding(
+            padding: const EdgeInsets.only(top: 2),
+            child: Text(
+              '${t.seedSaving.sourcePrefix}: '
+              '${sources.map((s) => s.title).join(' · ')}',
+              style: const TextStyle(color: seedMuted, fontSize: 11),
+            ),
+          ),
       ],
     );
   }