refactor: Eliminate bloated settings tabs (13→5)

## Changes

### 1. Eliminated Unnecessary Tabs ✅

**Before:** 13 tabs (bloated!)
**After:** 5 tabs (clean, focused)

**Removed:**
- ❌ WooNooW (nonsense toggles for essential features)
- ❌ Checkout (mirror WooCommerce, not essential)
- ❌ Customer Accounts (mirror WooCommerce, not essential)
- ❌ Brand & Appearance (merged into Store Details)
- ❌ Advanced (just redirected to WC)
- ❌ Integrations (just redirected to WC)
- ❌ System Status (just redirected to WC)
- ❌ Extensions (just redirected to WC)

**Kept:**
- ✅ Store Details (will enhance with branding)
- ✅ Payments (existing, working)
- ✅ Shipping & Delivery (existing, working)
- ✅ Tax (existing, working)
- ✅ Notifications (existing, working)

**Added:**
- ✅ Developer (debug mode, API logs, system info)

---

### 2. Created Refined Implementation Plan V2 ✅

**Document:** SETTINGS_PAGES_PLAN_V2.md

**Key Decisions:**

#### ✅ What We Build:
- Essential settings accessed frequently
- Simplified UI for complex WooCommerce features
- Industry best practices (Shopify, marketplaces)
- Critical features that enhance WooCommerce

#### ❌ What We Don't Build:
- Mirroring WooCommerce as-is
- Nonsense toggles for essential features
- Settings for non-tech users to break things
- Redundant configuration options

#### Philosophy:
> "We do the best config. Users focus on their business, not system configuration."

---

### 3. Specific Rejections (Based on Feedback)

**WooNooW Settings - ALL REJECTED:**
- ❌ Plugin Version (can be anywhere)
- ❌ Enable SPA Mode (plugin activation = enabled)
- ❌ Admin Theme toggle (will be in topbar)
- ❌ Items per page (per-table setting)
- ❌ Enable caching (we do best config)
- ❌ Cache duration (confusing for non-tech)
- ❌ Preload data (we optimize)
- ❌ Enable quick edit (essential, always on)
- ❌ Enable bulk actions (essential, always on)
- ❌ Enable keyboard shortcuts (essential, always on)
- ❌ Enable auto-save (essential, always on)

**Brand & Appearance - MERGED TO STORE DETAILS:**
- ✅ Store logo (merge to Store Details)
- ✅ Store icon (merge to Store Details)
- ✅ Store tagline (merge to Store Details)
- ✅ Brand colors (merge to Store Details)
- ❌ Typography (breaks design)
- ❌ Font size (use browser zoom)
- ❌ Sidebar position (we optimize)
- ❌ Sidebar collapsed (we optimize)
- ❌ Show breadcrumbs (we optimize)
- ❌ Compact mode (we optimize)
- ❌ Custom CSS (hard to use, move to Developer if needed)

**Checkout & Customer Accounts - NOT BUILDING:**
- We do the best config (industry standard)
- No need to mirror WooCommerce complexity
- Focus on business, not system configuration
- Users can use WC native settings if needed

---

### 4. Final Structure

```
Settings (5 tabs)
├── Store Details (enhanced with branding)
├── Payments (existing)
├── Shipping & Delivery (existing)
├── Tax (existing)
├── Notifications (existing)
└── Developer (new - debug, system info, cache)
```

---

### 5. Updated Both Backend and Frontend

**Backend:** NavigationRegistry.php
- Removed 8 tabs
- Added Developer tab
- Changed main settings path to /settings/store

**Frontend:** nav/tree.ts (fallback)
- Synced with backend
- Removed WooNooW tab
- Added Developer tab

---

## Philosophy

**We do the best config:**
- Essential features always enabled
- No confusing toggles
- Industry best practices
- Focus on business, not system

**Result:**
- 13 tabs → 5 tabs (62% reduction!)
- Clean, focused interface
- Professional
- Easy to use
- No bloat

admin-spa/src/nav/tree.ts

@@ -100,22 +100,17 @@ function getStaticFallbackTree(): MainNode[] {
     {
       key: 'settings',
       label: 'Settings',
-      path: '/settings',
+      path: '/settings/store',
       icon: 'settings',
       // Settings submenu available in all modes for consistent experience
       children: [
-        // WooNooW Settings
-        { label: 'WooNooW', mode: 'spa' as const, path: '/settings' },
-        
         // Core Settings (Shopify-inspired)
         { label: 'Store Details', mode: 'spa' as const, path: '/settings/store' },
         { label: 'Payments', mode: 'spa' as const, path: '/settings/payments' },
         { label: 'Shipping & Delivery', mode: 'spa' as const, path: '/settings/shipping' },
         { label: 'Tax', mode: 'spa' as const, path: '/settings/tax' },
-        { label: 'Checkout', mode: 'spa' as const, path: '/settings/checkout' },
-        { label: 'Customer Accounts', mode: 'spa' as const, path: '/settings/customers' },
         { label: 'Notifications', mode: 'spa' as const, path: '/settings/notifications' },
-        { label: 'Brand & Appearance', mode: 'spa' as const, path: '/settings/brand' },
+        { label: 'Developer', mode: 'spa' as const, path: '/settings/developer' },
       ],
     },
   ];