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/pubspec.yaml

@@ -44,6 +44,12 @@ dependencies:
   # Routing + media + paths.
   go_router: ^14.6.2
   image_picker: ^1.1.2
+  # On-device OCR (Tesseract, Apache-2.0/BSD) to suggest a name from a packet
+  # photo. Offline, no Google/cloud. Mobile-only; other platforms use a no-op.
+  flutter_tesseract_ocr: ^0.4.31
+  # Pure-Dart image preprocessing (grayscale/contrast/upscale) before OCR to
+  # lift accuracy on blurry packet photos.
+  image: ^4.3.0
   # Save/open dialogs for the inventory export/import (MIT license).
   file_picker: ^10.1.2
   path: ^1.9.0
@@ -82,6 +88,10 @@ flutter_launcher_icons:
     image_path: assets/icon.png
     background_color: "#2F7D34"
     theme_color: "#2F7D34"
+  windows:
+    generate: true
+    image_path: assets/icon.png
+    icon_size: 256
 
 # Native splash: white sprout on brand green, a darker green in dark mode.
 # Regenerate with: dart run flutter_native_splash:create
@@ -102,6 +112,13 @@ flutter:
     - assets/logo.png
     # Bundled so the Linux runner can use it as the GTK window icon.
     - assets/icon.png
+    # Tesseract OCR language data (tessdata_fast: eng + spa). Bundled for
+    # offline, on-device label OCR on mobile.
+    - assets/tessdata/
+    - assets/tessdata_config.json
+    # Real packet photos for the on-device OCR validation integration test.
+    # Remove before shipping if you don't want them in the bundle.
+    - assets/ocr_fixtures/
   fonts:
     # Custom seed-themed icon glyphs (chars a–k). See docs/mockups/seedks-glyphs.png.
     - family: seedks