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/db/tables.dart

@@ -12,6 +12,35 @@ class Varieties extends Table with SyncColumns {
   TextColumn get category =>
       text().nullable()(); // free text, prefilled from family
   TextColumn get notes => text().nullable()();
+
+  /// A draft captured photo-first ("capture now, catalogue later"): it holds a
+  /// photo but not yet a real name, and lives in the "to catalogue" tray until
+  /// the user labels it. A plain LWW scalar, so it merges like any other field.
+  BoolColumn get isDraft => boolean().withDefault(const Constant(false))();
+
+  /// Grower-declared organic ("eco") provenance. A self-declaration, not a
+  /// third-party certification (that would be a separate flag). Surfaced as a
+  /// badge and an inventory filter. A plain LWW scalar.
+  BoolColumn get isOrganic => boolean().withDefault(const Constant(false))();
+
+  /// A stewardship intent set by the grower: "regrow this variety this season"
+  /// before its stock or vitality runs out. Complements the automatic viability
+  /// warning (which is age-derived) with an explicit human decision. Surfaced
+  /// as a badge and an inventory filter. A plain LWW scalar.
+  BoolColumn get needsReproduction =>
+      boolean().withDefault(const Constant(false))();
+
+  /// Advisory crop-calendar months, typical for this variety — when to sow,
+  /// transplant, expect flowers/fruit, and harvest seed. Each phase usually
+  /// spans several months (e.g. sow in spring *and* autumn), so each is a set
+  /// of months packed as a 12-bit mask (see `domain/crop_calendar.dart`), an
+  /// optional LWW scalar; null means "not recorded". Guidance, not a per-year
+  /// actuals log (that path stays available via Movements).
+  IntColumn get sowMonths => integer().nullable()();
+  IntColumn get transplantMonths => integer().nullable()();
+  IntColumn get floweringMonths => integer().nullable()();
+  IntColumn get fruitingMonths => integer().nullable()();
+  IntColumn get seedHarvestMonths => integer().nullable()();
 }
 
 /// The multiple common names of a Variety (separate table so concurrent adds
@@ -30,6 +59,13 @@ class Species extends Table with SyncColumns {
   IntColumn get gbifKey => integer().nullable()();
   TextColumn get family => text().nullable()();
   BoolColumn get isBundled => boolean().withDefault(const Constant(false))();
+
+  /// Typical seed longevity in years under normal home storage — public-domain
+  /// reference data bundled with the catalog (agricultural-extension viability
+  /// tables). Drives the "expiring / past viability" warning on aging lots by
+  /// comparing against a lot's [Lots.harvestYear]. Nullable: unknown for
+  /// species without a bundled figure.
+  IntColumn get viabilityYears => integer().nullable()();
 }
 
 /// Localized common names for the catalog (bundled).
@@ -56,6 +92,23 @@ class Lots extends Table with SyncColumns {
   TextColumn get offerStatus =>
       textEnum<OfferStatus>().withDefault(const Constant('private'))();
   TextColumn get seedbankId => text().nullable()();
+
+  /// Provenance of this batch, kept as lightweight free text so it needs no
+  /// Party/Movement to record (the rigorous exchange path stays via Movements).
+  /// [originName] = who grew or gave the seeds; [originPlace] = where they come
+  /// from (with region/province). Both optional LWW scalars.
+  TextColumn get originName => text().nullable()();
+  TextColumn get originPlace => text().nullable()();
+
+  /// Optional coarse "how much I have" for this lot — see [Abundance]. An
+  /// offline alternative to the precise Quantity columns; either, both, or
+  /// neither may be set.
+  TextColumn get abundance => textEnum<Abundance>().nullable()();
+
+  /// How the (seed) lot is physically conserved — see [PreservationFormat].
+  /// Distinct from [storageLocation]. Optional.
+  TextColumn get preservationFormat =>
+      textEnum<PreservationFormat>().nullable()();
 }
 
 /// Optional germination history for a Lot; percent is derived in code.
@@ -67,6 +120,17 @@ class GerminationTests extends Table with SyncColumns {
   TextColumn get notes => text().nullable()();
 }
 
+/// Optional storage-condition history for a seed Lot: periodic physical checks
+/// of how many containers hold it and the state of the drying agent. Mirrors
+/// [GerminationTests] — a dated log under a Lot, newest shown first.
+class ConditionChecks extends Table with SyncColumns {
+  TextColumn get lotId => text()();
+  IntColumn get checkedOn => integer().nullable()(); // date, ms since epoch
+  IntColumn get containerCount => integer().nullable()(); // "botes"
+  TextColumn get desiccantState => textEnum<DesiccantState>().nullable()();
+  TextColumn get notes => text().nullable()();
+}
+
 /// The append-only event log on a Lot — history + provenance DAG.
 class Movements extends Table with AppendOnlyColumns {
   TextColumn get lotId => text()();