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/lib/ui/photo_pick.dart

@@ -44,3 +44,58 @@ Future<Uint8List?> pickPhoto(BuildContext context) async {
     return null;
   }
 }
+
+/// Rapid multi-capture for the "capture now, catalogue later" flow: pick many
+/// photos from the gallery at once, or shoot a burst with the camera (it
+/// reopens after each shot until the user cancels). Returns every captured
+/// image's bytes, or an empty list if cancelled/unavailable.
+Future<List<Uint8List>> pickPhotos(BuildContext context) async {
+  final t = context.t;
+  final source = await showModalBottomSheet<ImageSource>(
+    context: context,
+    builder: (sheetContext) => SafeArea(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          ListTile(
+            key: const Key('photos.source.camera'),
+            leading: const Icon(Icons.photo_camera_outlined),
+            title: Text(t.photo.camera),
+            onTap: () => Navigator.of(sheetContext).pop(ImageSource.camera),
+          ),
+          ListTile(
+            key: const Key('photos.source.gallery'),
+            leading: const Icon(Icons.photo_library_outlined),
+            title: Text(t.photo.gallery),
+            onTap: () => Navigator.of(sheetContext).pop(ImageSource.gallery),
+          ),
+        ],
+      ),
+    ),
+  );
+  if (source == null) return const [];
+  final picker = ImagePicker();
+  try {
+    if (source == ImageSource.gallery) {
+      final files = await picker.pickMultiImage(
+        maxWidth: 1280,
+        imageQuality: 80,
+      );
+      return [for (final file in files) await file.readAsBytes()];
+    }
+    // Camera burst: keep reopening the camera until the user cancels.
+    final shots = <Uint8List>[];
+    while (true) {
+      final file = await picker.pickImage(
+        source: ImageSource.camera,
+        maxWidth: 1280,
+        imageQuality: 80,
+      );
+      if (file == null) break;
+      shots.add(await file.readAsBytes());
+    }
+    return shots;
+  } on Object {
+    return const [];
+  }
+}