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/enums.dart

@@ -27,6 +27,46 @@ enum Presentation { pot, tray, plug, bareRoot, rootBall }
 /// Per-lot visibility (data-model §2.3). Used by the future sharing layer.
 enum OfferStatus { private, shared, exchange, sell }
 
+/// A coarse, offline-friendly "how much do I have" that fuses amount with
+/// shareability — the way a seed saver actually thinks, without weighing or
+/// counting. Modelled on the qualitative scale a real seed bank used
+/// (mucha/bastante/suficiente/poca), where each level is defined by what you
+/// can do with it. Optional alternative to a precise Quantity. Append-only by
+/// name.
+///
+/// - `plentyToShare` — surplus, free to give away (mucha).
+/// - `enoughToShare` — can share a little, sparingly (bastante).
+/// - `enoughForMe` — enough for my own use, not to share (suficiente).
+/// - `runningLow` — only enough to keep the variety alive (poca).
+enum Abundance { plentyToShare, enoughToShare, enoughForMe, runningLow }
+
+/// How dry seed is physically conserved — affects longevity, kept separate from
+/// *where* it is stored. Optional attribute of a seed [Lot]. Append-only by name.
+///
+/// - `jarWithDesiccant` — sealed jar with a drying agent (bote con sílice).
+/// - `glassJar` — plain glass jar (bote de cristal).
+/// - `paperEnvelope` — paper envelope (sobre de papel).
+/// - `paperBag` — paper bag (bolsa de papel).
+/// - `plasticBag` — plastic bag (bolsa de plástico).
+enum PreservationFormat {
+  jarWithDesiccant,
+  glassJar,
+  paperEnvelope,
+  paperBag,
+  plasticBag,
+}
+
+/// State of the drying agent (silica gel) in a stored seed container, recorded
+/// at a periodic condition check. The colour is a proxy for moisture: a
+/// saturated agent means the seed is at risk. Append-only by name.
+///
+/// - `none` — no drying agent present (no tiene).
+/// - `add` — should add some (se pone).
+/// - `replace` — saturated, replace it (se cambia).
+/// - `dry` — indicating dry (azul/blue).
+/// - `fresh` — just renewed (lila/violet).
+enum DesiccantState { none, add, replace, dry, fresh }
+
 /// Append-only event kinds on a Lot (data-model §2.4).
 enum MovementType {
   received,