feat(uat-batch): M43 follow-up — yacht detail field history

Extends Phase 3 from the M43 commit to yacht detail:
- New /api/v1/yachts/[id]/field-history endpoint joins through
  interests.yachtId (no schema migration needed) and filters to
  'yacht.%' paths so client-scoped overrides on the same interest
  don't bleed into the yacht surface.
- FieldHistoryScope.type accepts 'yacht'; provider URL routing
  generalised to /api/v1/<type>s/<id>/field-history.
- yacht-tabs OverviewTab wrapped in the provider; Name + the three
  ft-dimension rows get historyPath wired (m-dimension rows skipped —
  they're a unit-converted view of the same source value, and the
  supplemental writer only ever stores ft).

Addresses tab on Client detail intentionally left unwired — would
need AddressesEditor (a shared component) to surface icons per row,
which is more than the 5-min scope.

1454/1454 vitest, tsc clean.

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

src/app/api/v1/yachts/[id]/field-history/route.ts

@@ -0,0 +1,50 @@
+import { NextResponse } from 'next/server';
+import { and, desc, eq, sql } from 'drizzle-orm';
+
+import { withAuth, withPermission } from '@/lib/api/helpers';
+import { db } from '@/lib/db';
+import { interestFieldHistory, interests } from '@/lib/db/schema';
+import { errorResponse } from '@/lib/errors';
+
+/**
+ * GET /api/v1/yachts/[id]/field-history
+ *
+ * Returns every supplemental-form override that touched the yacht,
+ * resolved by joining interest_field_history through interests.yachtId.
+ * The history table itself doesn't carry a yacht_id column (the writer
+ * scopes by interest + client only) — joining at read time avoids a
+ * schema migration just to support this rollup.
+ */
+export const GET = withAuth(
+  withPermission('yachts', 'view', async (_req, ctx, params) => {
+    try {
+      const rows = await db
+        .select({
+          id: interestFieldHistory.id,
+          fieldPath: interestFieldHistory.fieldPath,
+          oldValue: interestFieldHistory.oldValue,
+          newValue: interestFieldHistory.newValue,
+          source: interestFieldHistory.source,
+          createdAt: interestFieldHistory.createdAt,
+        })
+        .from(interestFieldHistory)
+        .innerJoin(interests, eq(interests.id, interestFieldHistory.interestId))
+        .where(
+          and(
+            eq(interestFieldHistory.portId, ctx.portId),
+            eq(interests.yachtId, params.id!),
+            // Restrict to actually-yacht-scoped paths so the rollup
+            // doesn't surface "client email changed" rows on yacht detail
+            // (those overrides came in via a supplemental form attached
+            // to an interest that happens to link this yacht).
+            sql`${interestFieldHistory.fieldPath} LIKE 'yacht.%'`,
+          ),
+        )
+        .orderBy(desc(interestFieldHistory.createdAt))
+        .limit(100);
+      return NextResponse.json({ data: rows });
+    } catch (error) {
+      return errorResponse(error);
+    }
+  }),
+);