Do some refactoring

frontend/src/pages/relays/RelayDetail.tsx

@@ -1,6 +1,9 @@
 import { useParams, A } from "@solidjs/router"
 import { createResource, createSignal, Show } from "solid-js"
 import { deactivateTenantRelay, getTenantRelay } from "../../lib/api"
+import BackLink from "../../components/BackLink"
+import PageContainer from "../../components/PageContainer"
+import ResourceState from "../../components/ResourceState"
 
 export default function RelayDetail() {
   const params = useParams()
@@ -24,18 +27,16 @@ export default function RelayDetail() {
   }
 
   return (
-    <div class="max-w-4xl mx-auto px-4 py-8">
-      <div class="flex items-center gap-2 mb-6">
-        <A href="/relays" class="text-gray-500 hover:text-gray-700">← Relays</A>
-      </div>
+    <PageContainer>
+      <BackLink href="/relays" label="Relays" />
 
-      <Show when={relay.loading}>
-        <p class="text-gray-500 mb-4">Loading relay...</p>
-      </Show>
-
-      <Show when={relay.error && !relay.loading}>
-        <p class="text-red-600 mb-4">Failed to load relay.</p>
-      </Show>
+      <ResourceState
+        loading={relay.loading}
+        error={relay.error}
+        loadingText="Loading relay..."
+        errorText="Failed to load relay."
+        class="mb-4"
+      />
 
       <Show when={relay()}>
         {(loadedRelay) => (
@@ -67,6 +68,6 @@ export default function RelayDetail() {
       <Show when={error()}>
         <p class="mt-3 text-sm text-red-600">{error()}</p>
       </Show>
-    </div>
+    </PageContainer>
   )
 }

frontend/src/pages/relays/RelayEdit.tsx

@@ -1,9 +1,12 @@
-import { A, useNavigate, useParams } from "@solidjs/router"
+import { useNavigate, useParams } from "@solidjs/router"
 import { Show, createEffect, createResource, createSignal } from "solid-js"
 import { getTenantRelay, updateTenantRelay } from "../../lib/api"
 import RelayForm from "../../components/RelayForm"
 import { RELAY_PLAN_IDS, type RelayPlanId } from "../../lib/relayPlans"
 import { slugify } from "../../lib/slugify"
+import BackLink from "../../components/BackLink"
+import PageContainer from "../../components/PageContainer"
+import ResourceState from "../../components/ResourceState"
 
 export default function RelayEdit() {
   const navigate = useNavigate()
@@ -50,18 +53,16 @@ export default function RelayEdit() {
   }
 
   return (
-    <div class="max-w-2xl mx-auto px-4 py-8">
-      <div class="flex items-center gap-2 mb-6">
-        <A href={`/relays/${params.id}`} class="text-gray-500 hover:text-gray-700">← Back</A>
-      </div>
+    <PageContainer size="narrow">
+      <BackLink href={`/relays/${params.id}`} label="Back" />
       <h1 class="text-2xl font-bold text-gray-900 mb-6">Edit Relay</h1>
 
-      <Show when={relay.loading}>
-        <p class="text-gray-500">Loading relay...</p>
-      </Show>
-      <Show when={relay.error && !relay.loading}>
-        <p class="text-red-600">Failed to load relay.</p>
-      </Show>
+      <ResourceState
+        loading={relay.loading}
+        error={relay.error}
+        loadingText="Loading relay..."
+        errorText="Failed to load relay."
+      />
 
       <Show when={relay() && !relay.loading}>
         <RelayForm
@@ -83,6 +84,6 @@ export default function RelayEdit() {
           submittingLabel="Saving..."
         />
       </Show>
-    </div>
+    </PageContainer>
   )
 }

frontend/src/pages/relays/RelayList.tsx

@@ -1,6 +1,8 @@
 import { A } from "@solidjs/router"
 import { createMemo, createResource, createSignal, For, Show } from "solid-js"
 import { listTenantRelays } from "../../lib/api"
+import PageContainer from "../../components/PageContainer"
+import ResourceState from "../../components/ResourceState"
 
 export default function RelayList() {
   const [relays] = createResource(listTenantRelays)
@@ -20,7 +22,7 @@ export default function RelayList() {
   })
 
   return (
-    <div class="max-w-4xl mx-auto px-4 py-8">
+    <PageContainer>
       <div class="flex items-center justify-between mb-6">
         <h1 class="text-2xl font-bold text-gray-900">My Relays</h1>
         <A
@@ -53,13 +55,12 @@ export default function RelayList() {
         </select>
       </div>
 
-      <Show when={relays.loading}>
-        <p class="text-gray-500">Loading relays...</p>
-      </Show>
-
-      <Show when={relays.error && !relays.loading}>
-        <p class="text-red-600">Failed to load relays.</p>
-      </Show>
+      <ResourceState
+        loading={relays.loading}
+        error={relays.error}
+        loadingText="Loading relays..."
+        errorText="Failed to load relays."
+      />
 
       <Show when={(filtered().length ?? 0) > 0} fallback={<p class="text-gray-500">No relays match your filters.</p>}>
         <ul class="space-y-3">
@@ -83,6 +84,6 @@ export default function RelayList() {
           </For>
         </ul>
       </Show>
-    </div>
+    </PageContainer>
   )
 }