feat: Implement Phase 1 Shopify-inspired settings (Store, Payments, Shipping)

✨ Features:
- Store Details page with live currency preview
- Payments page with visual provider cards and test mode
- Shipping & Delivery page with zone cards and local pickup
- Shared components: SettingsLayout, SettingsCard, SettingsSection, ToggleField

🎨 UI/UX:
- Card-based layouts (not boring forms)
- Generous whitespace and visual hierarchy
- Toast notifications using sonner (reused from Orders)
- Sticky save button at top
- Mobile-responsive design

🔧 Technical:
- Installed ESLint with TypeScript support
- Fixed all lint errors (0 errors)
- Phase 1 files have zero warnings
- Used existing toast from sonner (not reinvented)
- Updated routes in App.tsx

📝 Files Created:
- Store.tsx (currency preview, address, timezone)
- Payments.tsx (provider cards, manual methods)
- Shipping.tsx (zone cards, rates, local pickup)
- SettingsLayout.tsx, SettingsCard.tsx, SettingsSection.tsx, ToggleField.tsx

Phase 1 complete: 18-24 hours estimated work

admin-spa/src/lib/api.ts

@@ -16,7 +16,7 @@ export const api = {
       try {
         const text = await res.text();
         responseData = text ? JSON.parse(text) : null;
-      } catch {}
+      } catch { /* ignore JSON parse errors */ }
       
       if (window.WNW_API?.isDev) {
         console.error('[WooNooW] API error', { url, status: res.status, statusText: res.statusText, data: responseData });

admin-spa/src/lib/currency.ts

@@ -150,7 +150,6 @@ export function makeMoneyFormatter(opts: MoneyOptions) {
  * Use inside components to avoid repeating memo logic.
  */
 export function useMoneyFormatter(opts: MoneyOptions) {
-  // eslint-disable-next-line react-hooks/rules-of-hooks
   // Note: file lives in /lib so we keep dependency-free; simple memo by JSON key is fine.
   const key = JSON.stringify({
     c: opts.currency,
@@ -162,7 +161,6 @@ export function useMoneyFormatter(opts: MoneyOptions) {
     ds: opts.decimalSep,
     pos: opts.position,
   });
-  // eslint-disable-next-line react-hooks/rules-of-hooks
   const ref = (globalThis as any).__wnw_money_cache || ((globalThis as any).__wnw_money_cache = new Map());
   if (!ref.has(key)) ref.set(key, makeMoneyFormatter(opts));
   return ref.get(key) as (v: MoneyInput) => string;