fix(review): black screen on Capture→Review — speciesId/gradeId refs

The merge auto-kept the branch's canCreateTitle reactive (speciesId) which is
undeclared in the merged file (main's canonical var is speciesSel) → ReferenceError
on Review mount → black screen. Also dropped the branch's duplicate gradeId (main
uses gradeSel) and repointed hydrate/patch to gradeSel. Live UAT verified: Review
now mounts and renders 'Review to Ready' with photo strip + Create buttons.

frontend/src/create/review/Review.svelte

@@ -99,7 +99,6 @@
   let gradeSel: string = '';
   let woodCatIds: number[] = [];
   let figureIds: number[] = [];
-  let gradeId: number | '' = '';
   let moistureId: number | '' = '';
   let figTagIds: number[] = [];
   let featTagIds: number[] = [];
@@ -128,7 +127,7 @@
   let createBusy = false;
   let createError = '';
   $: canCreateTitle =
-    speciesId !== '' && woodCatIds.length > 0;
+    speciesSel !== '' && woodCatIds.length > 0;
   $: canCreateDesc =
     canGenerateContent && title.trim() !== '' && shortDescription.trim() !== '';
   // Monotonic token: each commit captures the current value and ignores its
@@ -320,7 +319,7 @@
     woodCatIds = [...(s.wood_category_ids ?? [])];
     edgeSel = s.edge_type_term_id != null ? String(s.edge_type_term_id) : '';
     figureIds = [...(s.figure_term_ids ?? [])];
-    gradeId = s.grade_term_id ?? '';
+    gradeSel = s.grade_term_id != null ? String(s.grade_term_id) : '';
     moistureId = s.moisture_term_id ?? '';
     figTagIds = [...(s.fig_tag_ids ?? [])];
     featTagIds = [...(s.feat_tag_ids ?? [])];
@@ -393,7 +392,7 @@
         wood_category_ids: woodCatIds,
         edge_type_term_id: edgeSel === '' ? null : Number(edgeSel),
         figure_term_ids: figureIds,
-        grade_term_id: gradeId === '' ? null : Number(gradeId),
+        grade_term_id: gradeSel === '' ? null : Number(gradeSel),
         moisture_term_id: moistureId === '' ? null : Number(moistureId),
         fig_tag_ids: figTagIds,
         feat_tag_ids: featTagIds,