feat(01-04): wire CDN avatar into profile, edit page, sidebar, and mobile nav

- pets/[petId]/page.tsx: replace /api/avatar stub with NEXT_PUBLIC_R2_PUBLIC_URL CDN URL
- pets/[petId]/edit/page.tsx: pass initialAvatarKey to PetForm so AvatarUpload shows current photo
- Sidebar.tsx: add avatarKey to Pet type; show AvatarImage from CDN for active pet and dropdown list
- MobileNav.tsx: same CDN avatar pattern for mobile pet switcher
- next.config.ts: add images.remotePatterns for R2 CDN hostname (T-4-04 safeguard)

next.config.ts

@@ -1,7 +1,33 @@
 import type { NextConfig } from "next";
 
+/**
+ * Derive the R2 CDN hostname for Next.js Image remote patterns.
+ * Falls back to '*.r2.cloudflarestorage.com' when env var is not set (CI/build).
+ * The NEXT_PUBLIC_R2_PUBLIC_URL is the only R2 env var accessible client-side — it is
+ * the CDN domain only (not credentials).
+ */
+function getR2Hostname(): string {
+  const publicUrl = process.env.NEXT_PUBLIC_R2_PUBLIC_URL;
+  if (publicUrl) {
+    try {
+      return new URL(publicUrl).hostname;
+    } catch {
+      // Invalid URL — fall through to default
+    }
+  }
+  return "*.r2.cloudflarestorage.com";
+}
+
 const nextConfig: NextConfig = {
-  allowedDevOrigins: ['192.168.1.92'],
+  allowedDevOrigins: ["192.168.1.92"],
+  images: {
+    remotePatterns: [
+      {
+        protocol: "https",
+        hostname: getR2Hostname(),
+      },
+    ],
+  },
 };
 
 export default nextConfig;

src/app/(app)/pets/[petId]/edit/page.tsx

@@ -90,6 +90,7 @@ export default function EditPetPage() {
       <PetForm
         mode="edit"
         petId={pet.id}
+        initialAvatarKey={pet.avatarKey ?? null}
         initialValues={{
           name: pet.name,
           speciesId: pet.speciesId,

src/app/(app)/pets/[petId]/page.tsx

@@ -53,11 +53,11 @@ export default async function PetProfilePage({ params }: PageProps) {
     <div className="container max-w-[640px] mx-auto px-6 py-8">
       {/* Pet identity — pet-first, owner-subordinate */}
       <div className="flex flex-col items-center gap-3 mb-8">
-        {/* Avatar */}
+        {/* Avatar — served from Cloudflare CDN via NEXT_PUBLIC_R2_PUBLIC_URL */}
         <Avatar className="w-32 h-32 text-2xl">
           {pet.avatarKey && (
             <AvatarImage
-              src={`/api/avatar/${pet.avatarKey}`}
+              src={`${process.env.NEXT_PUBLIC_R2_PUBLIC_URL}/${pet.avatarKey}`}
               alt={pet.name}
             />
           )}

src/components/layout/MobileNav.tsx

@@ -17,13 +17,14 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
-import { Avatar, AvatarFallback } from "@/components/ui/avatar";
+import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
 import { Badge } from "@/components/ui/badge";
 import { useActivePet } from "@/context/ActivePetContext";
 
 type Pet = {
   id: string;
   name: string;
+  avatarKey: string | null;
   species: { name: string };
 };
 
@@ -67,6 +68,12 @@ export function MobileNav({ pets }: MobileNavProps) {
               aria-label="Switch active pet"
             >
               <Avatar className="h-6 w-6 shrink-0">
+                {activePet.avatarKey && (
+                  <AvatarImage
+                    src={`${process.env.NEXT_PUBLIC_R2_PUBLIC_URL}/${activePet.avatarKey}`}
+                    alt={activePet.name}
+                  />
+                )}
                 <AvatarFallback className="text-xs bg-muted">
                   {activePet.name.slice(0, 2).toUpperCase()}
                 </AvatarFallback>
@@ -84,6 +91,12 @@ export function MobileNav({ pets }: MobileNavProps) {
                   className="flex items-center gap-2 cursor-pointer"
                 >
                   <Avatar className="h-6 w-6 shrink-0">
+                    {pet.avatarKey && (
+                      <AvatarImage
+                        src={`${process.env.NEXT_PUBLIC_R2_PUBLIC_URL}/${pet.avatarKey}`}
+                        alt={pet.name}
+                      />
+                    )}
                     <AvatarFallback className="text-xs bg-muted">
                       {pet.name.slice(0, 2).toUpperCase()}
                     </AvatarFallback>

src/components/layout/Sidebar.tsx

@@ -19,13 +19,14 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "@/components/ui/dropdown-menu";
-import { Avatar, AvatarFallback } from "@/components/ui/avatar";
+import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
 import { Badge } from "@/components/ui/badge";
 import { useActivePet } from "@/context/ActivePetContext";
 
 type Pet = {
   id: string;
   name: string;
+  avatarKey: string | null;
   species: { name: string };
 };
 
@@ -82,6 +83,12 @@ export function Sidebar({ pets }: SidebarProps) {
               aria-label="Switch active pet"
             >
               <Avatar className="h-8 w-8 shrink-0">
+                {activePet.avatarKey && (
+                  <AvatarImage
+                    src={`${process.env.NEXT_PUBLIC_R2_PUBLIC_URL}/${activePet.avatarKey}`}
+                    alt={activePet.name}
+                  />
+                )}
                 <AvatarFallback className="text-xs bg-muted">
                   {activePet.name.slice(0, 2).toUpperCase()}
                 </AvatarFallback>
@@ -99,6 +106,12 @@ export function Sidebar({ pets }: SidebarProps) {
                   className="flex items-center gap-2 cursor-pointer"
                 >
                   <Avatar className="h-6 w-6 shrink-0">
+                    {pet.avatarKey && (
+                      <AvatarImage
+                        src={`${process.env.NEXT_PUBLIC_R2_PUBLIC_URL}/${pet.avatarKey}`}
+                        alt={pet.name}
+                      />
+                    )}
                     <AvatarFallback className="text-xs bg-muted">
                       {pet.name.slice(0, 2).toUpperCase()}
                     </AvatarFallback>