refactor(branding): rename app Tanemaki → Tane

Public name is now Tane (種, "seed"); Tanemaki (種まき, "to scatter seeds")
is kept only as etymology in the About screen and onboarding.

App not yet distributed, so format tokens rename cleanly with no migration:
backup extension .tanemaki→.tane, QR scheme tanemaki://→tane://, file
prefixes tane-*. Website link and species-catalog User-Agent →
tane.comunes.org. Android label capitalised to "Tane".

Identity/crypto constants already use org.comunes.tane (derivation, HKDF
backup, sync namespace, TANE1 recovery tag) — left untouched, so keys,
backups and sync are unaffected. Tests updated; analyze + full suite green.

apps/app_seeds/test/services/auto_backup_service_test.dart

@@ -74,7 +74,7 @@ void main() {
           .listSync()
           .whereType<File>()
           .map((f) => f.uri.pathSegments.last)
-          .where((n) => n.startsWith('tanemaki-auto-'))
+          .where((n) => n.startsWith('tane-auto-'))
           .toList()
         ..sort();
 
@@ -89,7 +89,7 @@ void main() {
     expect(await service.runIfDue(), isTrue);
 
     final copies = autoCopies();
-    expect(copies, ['tanemaki-auto-2026-07-10.tanemaki']);
+    expect(copies, ['tane-auto-2026-07-10.tane']);
     final bytes = File('${dir.path}/${copies.single}').readAsBytesSync();
     expect(BackupBox.looksSealed(bytes), isTrue);
   });
@@ -117,12 +117,12 @@ void main() {
     );
 
     expect(await service.runIfDue(), isTrue);
-    expect(autoCopies(), ['tanemaki-auto-2026-07-10.tanemaki']);
+    expect(autoCopies(), ['tane-auto-2026-07-10.tane']);
   });
 
   test('rotation keeps only the newest three copies', () async {
     for (final d in ['2020-01-01', '2020-01-02', '2020-01-03', '2020-01-04']) {
-      File('${dir.path}/tanemaki-auto-$d.tanemaki').writeAsBytesSync([0]);
+      File('${dir.path}/tane-auto-$d.tane').writeAsBytesSync([0]);
     }
     final service = newService(
       newExporter(),
@@ -133,9 +133,9 @@ void main() {
     await service.runIfDue();
 
     expect(autoCopies(), [
-      'tanemaki-auto-2020-01-03.tanemaki',
-      'tanemaki-auto-2020-01-04.tanemaki',
-      'tanemaki-auto-2026-07-10.tanemaki',
+      'tane-auto-2020-01-03.tane',
+      'tane-auto-2020-01-04.tane',
+      'tane-auto-2026-07-10.tane',
     ]);
   });
 
@@ -151,7 +151,7 @@ void main() {
     // runIfDue is a no-op today, but an explicit tap still makes a copy.
     expect(await service.runIfDue(), isFalse);
     expect(await service.backupNow(), isTrue);
-    expect(autoCopies(), ['tanemaki-auto-2026-07-10.tanemaki']);
+    expect(autoCopies(), ['tane-auto-2026-07-10.tane']);
   });
 
   test('a failed backup returns false and never throws', () async {

apps/app_seeds/test/services/export_import_service_test.dart

@@ -65,7 +65,7 @@ void main() {
 
     await service.exportBackup();
 
-    expect(files.savedName, endsWith('.tanemaki'));
+    expect(files.savedName, endsWith('.tane'));
     expect(BackupBox.looksSealed(files.saved!), isTrue);
     expect(String.fromCharCodes(files.saved!).contains('Secret'), isFalse);
   });

apps/app_seeds/test/services/label_sheet_service_test.dart

@@ -30,11 +30,11 @@ const _labels = [
     commonName: 'Acelga',
     scientificName: 'Beta vulgaris',
     details: '2006 · Perales',
-    qrData: 'tanemaki://seed?v=Acelga+de+Perales&y=2006',
+    qrData: 'tane://seed?v=Acelga+de+Perales&y=2006',
   ),
   LabelSheetLabel(
     varietyLabel: 'Alubia de Tolosa',
-    qrData: 'tanemaki://seed?v=Alubia+de+Tolosa',
+    qrData: 'tane://seed?v=Alubia+de+Tolosa',
   ),
 ];
 
@@ -57,7 +57,7 @@ void main() {
     final service = LabelSheetService(files: _RecordingFileService());
     final bytes = await service.buildPdf(
       labels: const [
-        LabelSheetLabel(varietyLabel: 'Maíz', qrData: 'tanemaki://seed?v=Maíz'),
+        LabelSheetLabel(varietyLabel: 'Maíz', qrData: 'tane://seed?v=Maíz'),
       ],
       format: LabelSheetFormat.stickers,
     );
@@ -68,7 +68,7 @@ void main() {
     final service = LabelSheetService(files: _RecordingFileService());
     final bytes = await service.buildPdf(
       labels: const [
-        LabelSheetLabel(varietyLabel: 'بامية', qrData: 'tanemaki://seed?v=x'),
+        LabelSheetLabel(varietyLabel: 'بامية', qrData: 'tane://seed?v=x'),
       ],
       format: LabelSheetFormat.cards,
       rtl: true,
@@ -82,11 +82,11 @@ void main() {
     final saved = await service.saveLabels(
       labels: _labels,
       format: LabelSheetFormat.cards,
-      suggestedName: 'tanemaki-labels-2026-07-10.pdf',
+      suggestedName: 'tane-labels-2026-07-10.pdf',
     );
 
     expect(saved, isTrue);
-    expect(files.savedName, 'tanemaki-labels-2026-07-10.pdf');
+    expect(files.savedName, 'tane-labels-2026-07-10.pdf');
     expect(String.fromCharCodes(files.saved!.take(5)), '%PDF-');
   });
 }

apps/app_seeds/test/services/share_catalog_service_test.dart

@@ -55,12 +55,12 @@ void main() {
     final saved = await service.saveCatalog(
       title: 'What I share',
       date: 'July 9, 2026',
-      suggestedName: 'tanemaki-catalog-2026-07-09.pdf',
+      suggestedName: 'tane-catalog-2026-07-09.pdf',
       rows: const [ShareCatalogRow(name: 'Maize', mode: 'To give away')],
     );
 
     expect(saved, isTrue);
-    expect(files.savedName, 'tanemaki-catalog-2026-07-09.pdf');
+    expect(files.savedName, 'tane-catalog-2026-07-09.pdf');
     expect(String.fromCharCodes(files.saved!.take(5)), '%PDF-');
   });
 }