feat(equipment): member browse + reserve + sidebar link

/equipment lists active equipment for any member with status and the
required-certification gate shown up front (Reserve is disabled when the
item is unavailable or the member is not certified). Reserving opens an
inline start/end/notes form; the action enforces eligibility and
no-overlap server-side. Sidebar gets a member-visible "Equipment" link.

app/(app)/equipment/page.tsx

@@ -0,0 +1,27 @@
+import { createClient } from '@/lib/supabase/server'
+import { redirect } from 'next/navigation'
+import { listEquipmentForMembers } from '@/lib/actions'
+import { EquipmentBrowseClient } from './equipment-browse-client'
+
+export const dynamic = 'force-dynamic'
+
+export default async function EquipmentPage() {
+  const supabase = await createClient()
+  const {
+    data: { user },
+  } = await supabase.auth.getUser()
+  if (!user) redirect('/login')
+
+  const { data: member } = await supabase
+    .from('space_members')
+    .select('space_id')
+    .eq('user_id', user.id)
+    .in('status', ['current', 'unverified', 'late'])
+    .maybeSingle()
+  if (!member) redirect('/signup')
+
+  const res = await listEquipmentForMembers()
+  const equipment = 'data' in res ? res.data : []
+
+  return <EquipmentBrowseClient equipment={equipment as unknown[]} />
+}