feat(tenancies-p6-followup): generic create dialog + edit dialog + self-FKs

- Migration 0086: berth_tenancies.previous_tenancy_id +
  transferred_from_tenancy_id self-FKs + partial indexes. Per
  docs/tenancies-design.md these chain renewal / transfer successors
  to predecessors for fixed-term and seasonal lineage. Schema mirrored
  in tenancies.ts with AnyPgColumn typed-import.
- POST /api/v1/tenancies (generic create): accepts berthId in the
  body so client + yacht tab entry points don't have to bounce through
  /api/v1/berths/[id]/tenancies. Same createPending service helper.
- TenancyCreateDialog: <TenancyCreateDialog open clientId? yachtId?
  berthId? /> with all three pickers; pre-fills the carrier from the
  parent entity. POSTs to /api/v1/tenancies; "Create" and
  "Create and activate" CTAs both wire to the new endpoint.
- Mounted on ClientTenanciesTab + YachtTenanciesTab behind
  <PermissionGate resource="tenancies" action="manage"> so reps can
  mint tenancies directly from those tabs without bouncing through
  the berth page.
- TenancyEditDialog: edit metadata only (start/end dates, tenure type,
  notes) via the new action='update' branch on the [id] PATCH route.
  Status transitions stay on activate/end/cancel. Wired into the
  tenancy detail page header. Outer wrapper unmounts on close so the
  form re-initialises from current row data without setState-in-effect.
- updateTenancy service helper + PATCH action='update' branch added.
  Audit-logged + emits berth_tenancy:activated to invalidate detail
  query caches.

Renew + Transfer dialogs deferred — both need lineage UX decisions
(tenure-aware mutate-in-place vs new-row spawn; client/yacht swap
semantics) and the self-FK columns this commit lands are the
underpinning. Next sub-task.

Verified: tsc clean, 1493/1493 vitest, migration applied.

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

src/lib/services/berth-tenancies.service.ts

@@ -18,6 +18,7 @@ import type {
   EndTenancyInput,
   CancelInput,
   ListTenanciesInput,
+  UpdateTenancyInput,
 } from '@/lib/validators/tenancies';
 
 // Use z.input so callers (including tests) can omit fields with
@@ -354,6 +355,55 @@ export async function cancel(
   return updated;
 }
 
+// ─── Update (metadata only — non-status fields) ──────────────────────────────
+
+export async function updateTenancy(
+  tenancyId: string,
+  portId: string,
+  data: UpdateTenancyInput,
+  meta: AuditMeta,
+): Promise<BerthTenancy> {
+  const existing = await loadScoped(tenancyId, portId);
+
+  const patch: Partial<typeof berthTenancies.$inferInsert> = { updatedAt: new Date() };
+  if (data.startDate !== undefined) patch.startDate = data.startDate;
+  if (data.endDate !== undefined) patch.endDate = data.endDate;
+  if (data.tenureType !== undefined) patch.tenureType = data.tenureType;
+  if (data.notes !== undefined) patch.notes = data.notes;
+
+  const [updated] = await db
+    .update(berthTenancies)
+    .set(patch)
+    .where(and(eq(berthTenancies.id, tenancyId), eq(berthTenancies.portId, portId)))
+    .returning();
+
+  if (!updated) throw new NotFoundError('Tenancy');
+
+  void createAuditLog({
+    userId: meta.userId,
+    portId,
+    action: 'update',
+    entityType: 'berth_tenancy',
+    entityId: tenancyId,
+    oldValue: {
+      startDate: existing.startDate,
+      endDate: existing.endDate,
+      tenureType: existing.tenureType,
+      notes: existing.notes,
+    },
+    newValue: patch,
+    ipAddress: meta.ipAddress,
+    userAgent: meta.userAgent,
+  });
+
+  emitToRoom(`port:${portId}`, 'berth_tenancy:activated', {
+    tenancyId,
+    berthId: updated.berthId,
+  });
+
+  return updated;
+}
+
 // ─── Get ─────────────────────────────────────────────────────────────────────
 
 export async function getById(id: string, portId: string): Promise<BerthTenancy> {