feat(inventory): photo-first drafts + on-device OCR (digitization R2+R4)

Lower the bulk-digitization cliff with two more routes on top of the
already-landed CSV import and "save and add another":

- Photo-first drafts (capture now, catalogue later): burst-capture
  photos (camera or multi-gallery) into unnamed draft varieties, shown
  in a "to catalogue" tray, hidden from the main list until named.
  Adds Variety.isDraft (schema), addDraftVariety/watchDrafts/nameDraft,
  the triage sheet and the inventory banner.
- On-device OCR label suggestion (Tesseract, offline, no Google): a
  "Suggest name from photo" button in the naming dialog behind a
  LabelTextExtractor interface (Tesseract on Android/iOS, no-op
  elsewhere). Reads the largest print via hOCR bounding boxes, drops
  boilerplate/low-confidence noise, preprocesses (grayscale, contrast,
  upscale) and sweeps rotations (0-315 deg) so tilted packets still
  read. Bundles tessdata_fast eng+spa; validated on-device against real
  packets. The photo is written to a temp file deleted immediately in a
  finally block (the plugin needs a path) - a bounded, documented
  exception to no-plaintext-at-rest.

This commit also carries the co-developed schema evolution v5 to v8 that
shares these files (organic flag, species viability years, crop
calendar, lot provenance/abundance/preservation format, condition
checks) plus their exports/migrations and i18n.

Tests: CSV/draft/OCR unit + widget + migration green in isolation.
Note: the full widget suite currently hangs (>10 min) - under investigation.

apps/app_seeds/test/ui/draft_triage_test.dart

@@ -0,0 +1,72 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tane/i18n/strings.g.dart';
+import 'package:tane/ui/inventory_list_screen.dart';
+
+import '../support/test_support.dart';
+
+void main() {
+  // A valid 1×1 PNG so Image.memory decodes it in the widget test (the seed
+  // only nudges a trailing byte to keep captures distinct).
+  Uint8List photo(int seed) => Uint8List.fromList([
+    0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, //
+    0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52,
+    0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
+    0x08, 0x06, 0x00, 0x00, 0x00, 0x1F, 0x15, 0xC4,
+    0x89, 0x00, 0x00, 0x00, 0x0A, 0x49, 0x44, 0x41,
+    0x54, 0x78, 0x9C, 0x63, 0x00, 0x01, 0x00, 0x00,
+    0x05, 0x00, 0x01, 0x0D, 0x0A, 0x2D, 0xB4, 0x00,
+    0x00, 0x00, 0x00, 0x49, 0x45, 0x4E, 0x44, 0xAE,
+    0x42, 0x60, 0x82, seed,
+  ]);
+
+  testWidgets(
+    'drafts show a triage banner, stay out of the list, and can be named',
+    (tester) async {
+      LocaleSettings.setLocaleSync(AppLocale.en);
+      final db = newTestDatabase();
+      addTearDown(db.close);
+      final repo = newTestRepository(db);
+      await repo.addDraftVariety(photo(1));
+      await repo.addDraftVariety(photo(2));
+
+      await tester.pumpWidget(
+        wrapScreen(repository: repo, child: const InventoryListScreen()),
+      );
+      await tester.pumpAndSettle();
+
+      // The two captures are in the tray, not the main list.
+      expect(find.byKey(const Key('inventory.triageBanner')), findsOneWidget);
+      expect(find.text('2 to catalogue'), findsOneWidget);
+      expect(find.text('No seeds yet. Tap + to add your first.'), findsOneWidget);
+
+      // Open the tray and name the first draft.
+      await tester.tap(find.byKey(const Key('inventory.triageBanner')));
+      await tester.pumpAndSettle();
+      expect(find.text('Unnamed'), findsNWidgets(2));
+
+      await tester.tap(find.text('Unnamed').first);
+      await tester.pumpAndSettle();
+      await tester.enterText(
+        find.byKey(const Key('draft.nameField')),
+        'Grandma tomato',
+      );
+      await tester.tap(find.byKey(const Key('draft.nameSave')));
+      await tester.pumpAndSettle();
+
+      // One draft left in the tray…
+      expect(find.text('Unnamed'), findsOneWidget);
+
+      // …and close the sheet: the named seed is now in the inventory, the
+      // banner shows one remaining.
+      await tester.tapAt(const Offset(20, 20));
+      await tester.pumpAndSettle();
+      expect(find.text('Grandma tomato'), findsOneWidget);
+      expect(find.text('1 to catalogue'), findsOneWidget);
+
+      await disposeTree(tester);
+    },
+  );
+}