feat(inventory): seed/plant clarity + full-screen photo viewer

- Each lot shows a Seeds/Plantel chip (green vs teal, with icon) so mixed
  seed-and-plant varieties read clearly at a glance.
- Germination is hidden on plant lots (it only applies to seeds).
- Tapping a photo in the detail carousel opens a full-screen, swipeable,
  pinch-to-zoom viewer.

Tests: plant lot shows the Plants chip and hides germination. 53 green; Linux runs.

apps/app_seeds/lib/ui/variety_detail_screen.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:image_picker/image_picker.dart';
+import 'package:material_symbols_icons/symbols.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../data/species_repository.dart';
@@ -154,11 +155,20 @@ class _DetailView extends StatelessWidget {
                 leading: lot.quantity == null
                     ? const Icon(Icons.inventory_2_outlined)
                     : QuantityKindIcon(lot.quantity!.kind, size: 28),
-                title: Text(_lotSubtitle(t, lot)),
+                title: Row(
+                  children: [
+                    _LotTypeChip(type: lot.type),
+                    const SizedBox(width: 8),
+                    Expanded(child: Text(_lotSubtitle(t, lot))),
+                  ],
+                ),
                 subtitle: lot.storageLocation == null
                     ? null
                     : Text(lot.storageLocation!),
-                trailing: Row(
+                // Germination only applies to seed lots, not to plantel.
+                trailing: lot.type != LotType.seed
+                    ? null
+                    : Row(
                         mainAxisSize: MainAxisSize.min,
                         children: [
                           if (lot.latestGerminationRate != null)
@@ -193,6 +203,45 @@ String _lotSubtitle(Translations t, VarietyLot lot) {
 String _germinationPercent(Translations t, double rate) =>
     t.germination.result(percent: (rate * 100).round());
 
+/// A small pill making a lot's kind (seeds vs plants/plantel) unmistakable.
+class _LotTypeChip extends StatelessWidget {
+  const _LotTypeChip({required this.type});
+
+  final LotType type;
+
+  @override
+  Widget build(BuildContext context) {
+    final t = context.t;
+    final isPlant = type == LotType.plant;
+    final color = isPlant ? const Color(0xFF00796B) : seedGreenDark;
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
+      decoration: BoxDecoration(
+        color: color.withValues(alpha: 0.12),
+        borderRadius: BorderRadius.circular(8),
+      ),
+      child: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          if (isPlant)
+            Icon(Symbols.potted_plant, size: 14, color: color)
+          else
+            SeedGlyph(SeedGlyphs.jars, size: 14, color: color),
+          const SizedBox(width: 4),
+          Text(
+            isPlant ? t.lotType.plant : t.lotType.seed,
+            style: TextStyle(
+              fontSize: 11,
+              color: color,
+              fontWeight: FontWeight.w600,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
 /// A compact pill showing the latest germination rate on a lot tile.
 class _GerminationBadge extends StatelessWidget {
   const _GerminationBadge({required this.rate});
@@ -854,7 +903,9 @@ class _PhotoGalleryState extends State<_PhotoGallery> {
                     controller: _controller,
                     itemCount: photos.length,
                     onPageChanged: (i) => setState(() => _page = i),
-                    itemBuilder: (_, i) => Image.memory(
+                    itemBuilder: (_, i) => GestureDetector(
+                      onTap: () => _openPhotoViewer(context, photos, i),
+                      child: Image.memory(
                         photos[i].bytes,
                         width: 140,
                         height: 140,
@@ -862,6 +913,7 @@ class _PhotoGalleryState extends State<_PhotoGallery> {
                       ),
                     ),
                   ),
+                ),
                 Positioned(
                   top: 2,
                   right: 2,
@@ -941,6 +993,48 @@ class _Dots extends StatelessWidget {
   }
 }
 
+void _openPhotoViewer(
+  BuildContext context,
+  List<VarietyPhoto> photos,
+  int initialIndex,
+) {
+  Navigator.of(context).push(
+    MaterialPageRoute<void>(
+      fullscreenDialog: true,
+      builder: (_) => _PhotoViewer(photos: photos, initialIndex: initialIndex),
+    ),
+  );
+}
+
+/// Full-screen, swipeable, pinch-to-zoom photo viewer.
+class _PhotoViewer extends StatelessWidget {
+  const _PhotoViewer({required this.photos, required this.initialIndex});
+
+  final List<VarietyPhoto> photos;
+  final int initialIndex;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.black,
+      appBar: AppBar(
+        backgroundColor: Colors.black,
+        foregroundColor: Colors.white,
+        elevation: 0,
+      ),
+      body: PageView.builder(
+        controller: PageController(initialPage: initialIndex),
+        itemCount: photos.length,
+        itemBuilder: (_, i) => InteractiveViewer(
+          minScale: 1,
+          maxScale: 5,
+          child: Center(child: Image.memory(photos[i].bytes)),
+        ),
+      ),
+    );
+  }
+}
+
 class _SectionTitle extends StatelessWidget {
   const _SectionTitle(this.text);
 

apps/app_seeds/test/ui/variety_detail_screen_test.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:tane/data/species_repository.dart';
 import 'package:tane/db/database.dart';
+import 'package:tane/db/enums.dart';
 
 import '../support/test_support.dart';
 
@@ -358,4 +359,32 @@ void main() {
     expect(find.text('Wiki'), findsNothing);
     await disposeTree(tester);
   });
+
+  testWidgets('plant lots show the Plants chip and hide germination', (
+    tester,
+  ) async {
+    final repo = newTestRepository(db);
+    final id = await repo.addQuickVariety(label: 'Tomato');
+    await repo.addLot(
+      varietyId: id,
+      type: LotType.plant,
+      harvestYear: 2024,
+      quantity: const Quantity(kind: QuantityKind.plant, count: 3),
+    );
+
+    await tester.pumpWidget(
+      wrapDetail(
+        repository: repo,
+        varietyId: id,
+        species: newTestSpeciesRepository(db),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.text('Plants'), findsOneWidget); // lot-type chip
+    expect(find.text('Year 2024 · 3 plants'), findsOneWidget);
+    // Germination is seed-only.
+    expect(find.byIcon(Icons.grass_outlined), findsNothing);
+    await disposeTree(tester);
+  });
 }