fix: Implement comprehensive Supabase cookie configuration for Docker environment

Client-side improvements (supabase.ts):
- Set detectSessionInUrl: false to prevent SSR redirect loops
- Add explicit cookieOptions with Docker-friendly settings
- Configure secure: false for localhost non-HTTPS
- Set sameSite: 'lax' for proper navigation cookie handling

Server-side improvements (supabase-ssr.ts):
- Add comprehensive default cookie options
- Ensure consistent cookie configuration across all server clients
- Set maxAge: 7 days for proper session persistence
- Maintain security with httpOnly: true

These changes address session persistence issues in Docker containers
and should resolve Stripe setup redirect loops for existing users.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/lib/supabase-ssr.ts

@@ -6,6 +6,15 @@ export function createSupabaseServerClient(
   cookies: AstroCookies,
   cookieOptions?: CookieOptions
 ) {
+  // Default cookie options for Docker/localhost environment
+  const defaultCookieOptions: CookieOptions = {
+    secure: false,              // localhost is non-HTTPS in Docker
+    sameSite: 'lax',            // allow cross-site cookie on navigation  
+    path: '/',                  // root-wide access
+    httpOnly: true,             // JS-inaccessible for security
+    maxAge: 60 * 60 * 24 * 7,   // 7 days
+  };
+
   return createServerClient<Database>(
     import.meta.env.PUBLIC_SUPABASE_URL!,
     import.meta.env.PUBLIC_SUPABASE_ANON_KEY!,
@@ -17,24 +26,22 @@ export function createSupabaseServerClient(
         },
         set(name: string, value: string, options: CookieOptions) {
           if (!cookies) return;
-          // Fix cookie settings for Docker/production
+          // Merge with default options, allowing overrides
           cookies.set(name, value, {
+            ...defaultCookieOptions,
+            ...cookieOptions,
             ...options,
-            httpOnly: true,
-            secure: false, // Set to false for Docker/localhost
-            sameSite: 'lax',
-            path: '/'
           })
         },
         remove(name: string, options: CookieOptions) {
           if (!cookies) return;
           cookies.delete(name, {
+            ...defaultCookieOptions,
             ...options,
-            path: '/'
           })
         },
       },
-      cookieOptions,
+      cookieOptions: defaultCookieOptions,
     }
   )
 }