Improve shop UX, starting balance, and top bar branding.

Give new users 100 free points, allow shop previews regardless of balance, rename clothing items with descriptive labels, and show only the HaBit logo in the top-left.

lib/avatar-progression-storage.ts

@@ -1,3 +1,4 @@
+import { DEFAULT_STARTING_COINS } from "@/lib/coins";
 import { createClient } from "@/lib/supabase/client";
 
 async function getAuthenticatedUserId() {
@@ -35,13 +36,13 @@ export async function getCoins(): Promise<number> {
   if (!data) {
     const { error: insertError } = await supabase
       .from("avatar_state")
-      .insert({ user_id: userId, coins: 0 });
+      .insert({ user_id: userId, coins: DEFAULT_STARTING_COINS });
 
     if (insertError) {
       throw new Error(insertError.message);
     }
 
-    return 0;
+    return DEFAULT_STARTING_COINS;
   }
 
   return data.coins ?? 0;