refactor(assets): relocate character avatars

src/app/_components/__tests__/tailwind-components.test.tsx

@@ -56,7 +56,7 @@ describe("shared Tailwind components", () => {
     expect(html).toContain("width:48px");
     expect(html).toContain("height:48px");
     expect(html).toContain("size-full object-cover");
-    expect(html).toContain("%2Fimages%2Fchat%2Fpic-chat-elio.png");
+    expect(html).toContain("%2Fimages%2Favatar%2Felio.png");
   });
 
   it("renders UserMessageAvatar custom and fallback images", () => {
@@ -71,6 +71,6 @@ describe("shared Tailwind components", () => {
     expect(userHtml).toContain("size-full object-cover");
     expect(userHtml).toContain("%2Favatar.png");
     expect(guestHtml).toContain('aria-label="Guest avatar"');
-    expect(guestHtml).toContain("%2Fimages%2Fchat%2Fpic-chat-guest.png");
+    expect(guestHtml).toContain("%2Fimages%2Favatar%2Fplaceholder.png");
   });
 });

src/app/_components/character-avatar.tsx

@@ -13,7 +13,7 @@ export interface CharacterAvatarProps {
 }
 
 export function CharacterAvatar({
-  src = "/images/chat/pic-chat-elio.png",
+  src = "/images/avatar/elio.png",
   alt = "Elio Silvestri",
   className,
   size = 43,

src/app/_components/user-message-avatar.tsx

@@ -47,7 +47,7 @@ export function UserMessageAvatar({
       aria-label="Guest avatar"
     >
       <Image
-        src="/images/chat/pic-chat-guest.png"
+        src="/images/avatar/placeholder.png"
         alt="Guest"
         width={imageSize}
         height={imageSize}