fix: handle missing profile on login with auto-creation

src/stores/auth.ts

@@ -26,11 +26,27 @@ export const useAuthStore = create<AuthState>((set, get) => ({
     const { user } = get()
     if (!user) return set({ profile: null })
 
-    const { data } = await supabase
+    const { data, error } = await supabase
       .from('profiles')
       .select('*')
       .eq('id', user.id)
-      .single()
+      .maybeSingle()
+
+    if (error) {
+      console.error('Error fetching profile:', error)
+      return set({ profile: null })
+    }
+
+    // Auto-create profile if it doesn't exist (trigger may have failed)
+    if (!data) {
+      const username = user.user_metadata?.username || user.email?.split('@')[0] || 'user'
+      const { data: newProfile } = await supabase
+        .from('profiles')
+        .insert({ id: user.id, username })
+        .select()
+        .single()
+      return set({ profile: newProfile })
+    }
 
     set({ profile: data })
   },