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-customization-storage.ts

@@ -1,3 +1,4 @@
+import { DEFAULT_STARTING_COINS } from "@/lib/coins";
 import { notifyHabitPetDataUpdated } from "@/lib/app-events";
 import {
   hexToHsl,
@@ -204,6 +205,7 @@ export async function getAvatarCustomization(): Promise<AvatarCustomization> {
   if (!data) {
     const { error: insertError } = await supabase.from("avatar_state").insert({
       user_id: userId,
+      coins: DEFAULT_STARTING_COINS,
       avatar_name: DEFAULT_AVATAR_NAME,
       skin_color: DEFAULT_HEX,
       pants_style: NONE_VARIANT_ID,