feat(interests): desired-dimension form fields + size-desired column

Surfaces the recommender inputs added in Phase 2a (interests
.desired_length_ft / desired_width_ft / desired_draft_ft) on the
two interfaces reps actually use:

- /interests list: new "Berth size desired" column rendered as a
  compact "60×18×6 ft" string. Cells with no dimensions show "-";
  partial dimensions render "?" for the missing axis (recommender
  treats null as "no constraint").
- New/Edit Interest form: three optional length/width/draft inputs
  with explanatory subhead. Empty submissions collapse to undefined
  so the API doesn't see "" -> numeric coercion errors.
- createInterestSchema gains the three optional desired-dim fields
  with a shared transform that coerces strings/numbers to a positive
  2-decimal numeric string for the postgres `numeric` column.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/interests/interest-columns.tsx

@@ -37,10 +37,34 @@ export interface InterestRow {
   dateDepositReceived?: string | null;
   eoiStatus?: string | null;
   outcome?: string | null;
+  /** Imperial; nullable. Recommender treats nulls as "no constraint" on
+   *  that axis. Rendered as a compact "60×18×6 ft" string in the list. */
+  desiredLengthFt?: string | number | null;
+  desiredWidthFt?: string | number | null;
+  desiredDraftFt?: string | number | null;
   notesCount?: number;
   tags?: Array<{ id: string; name: string; color: string }>;
 }
 
+function formatDim(value: string | number | null | undefined): string {
+  if (value === null || value === undefined || value === '') return '?';
+  const n = typeof value === 'number' ? value : parseFloat(value);
+  if (!Number.isFinite(n)) return '?';
+  return Number.isInteger(n) ? String(n) : n.toFixed(1);
+}
+
+function formatDesiredSize(row: InterestRow): string | null {
+  const { desiredLengthFt, desiredWidthFt, desiredDraftFt } = row;
+  if (
+    (desiredLengthFt === null || desiredLengthFt === undefined || desiredLengthFt === '') &&
+    (desiredWidthFt === null || desiredWidthFt === undefined || desiredWidthFt === '') &&
+    (desiredDraftFt === null || desiredDraftFt === undefined || desiredDraftFt === '')
+  ) {
+    return null;
+  }
+  return `${formatDim(desiredLengthFt)}×${formatDim(desiredWidthFt)}×${formatDim(desiredDraftFt)} ft`;
+}
+
 const SOURCE_LABELS: Record<string, string> = {
   website: 'Website',
   manual: 'Manual',
@@ -134,6 +158,16 @@ export function getInterestColumns({
         );
       },
     },
+    {
+      id: 'desiredSize',
+      header: 'Berth size desired',
+      enableSorting: false,
+      cell: ({ row }) => {
+        const label = formatDesiredSize(row.original);
+        if (!label) return <span className="text-muted-foreground">-</span>;
+        return <span className="text-sm tabular-nums">{label}</span>;
+      },
+    },
     {
       id: 'pipelineStage',
       accessorKey: 'pipelineStage',