feat: complete vendor frontend parity with admin

Phase 1 - Sidebar Refactor:
- Refactor sidebar to use collapsible sections with Alpine.js
- Add localStorage persistence for section states
- Reorganize navigation into logical groups

Phase 2 - Core JS Files:
- Add products.js: product CRUD, search, filtering, toggle active/featured
- Add orders.js: order list, status management, filtering
- Add inventory.js: stock tracking, adjust/set quantity modals
- Add customers.js: customer list, order history, messaging
- Add team.js: member invite, role management, remove members
- Add profile.js: profile editing with form validation
- Add settings.js: tabbed settings (general, marketplace, notifications)

Templates updated from placeholders to full functional UIs.
Vendor frontend now at ~90% parity with admin.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/implementation/vendor-frontend-parity-plan.md

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+# Vendor Frontend Parity Plan
+
+**Created:** January 1, 2026
+**Status:** In Progress
+
+## Executive Summary
+
+The vendor frontend is now approximately 90% complete compared to admin. Phase 1 (Sidebar Refactor) and Phase 2 (Core JS Files) are complete. Only Phase 3 (New Features like notifications and analytics) remains.
+
+---
+
+## Phase 1: Sidebar Refactor ✅ COMPLETED
+
+### Goals
+- ✅ Refactor vendor sidebar to use Jinja2 macros (like admin)
+- ✅ Add collapsible sections with Alpine.js
+- ✅ Reorganize into logical groups
+- ✅ Add localStorage for section state persistence
+- ✅ Complete mobile sidebar implementation
+
+### New Sidebar Structure
+```
+Dashboard
+├── Products & Inventory (collapsible)
+│   ├── All Products
+│   ├── Inventory
+│   └── Marketplace Import
+├── Sales & Orders (collapsible)
+│   ├── Orders
+│   ├── Letzshop Orders
+│   └── Invoices
+├── Customers & Communication (collapsible)
+│   ├── Customers
+│   └── Messages
+├── Shop & Content (collapsible)
+│   └── Content Pages
+└── Account & Settings (collapsible)
+    ├── Team
+    ├── Profile
+    ├── Billing
+    └── Settings
+```
+
+### Files to Modify
+- `app/templates/vendor/partials/sidebar.html` - Main refactor
+- `static/vendor/js/init-alpine.js` - Add sidebar state management
+
+---
+
+## Phase 2: Core JavaScript Files
+
+### Priority 1 (Critical)
+| File | Purpose | Effort |
+|------|---------|--------|
+| `products.js` | Product CRUD, search, filtering, bulk ops | 4-6 hours |
+| `orders.js` | Order list, filtering, status management | 4-6 hours |
+| `inventory.js` | Stock tracking, adjustments, alerts | 3-4 hours |
+| `customers.js` | Customer list, purchase history | 3-4 hours |
+
+### Priority 2 (High)
+| File | Purpose | Effort |
+|------|---------|--------|
+| `team.js` | Member invite, role management | 2-3 hours |
+| `profile.js` | Profile editing, avatar upload | 2-3 hours |
+| `settings.js` | Settings forms, preferences | 2-3 hours |
+| `content-pages.js` | CMS page management | 3-4 hours |
+
+---
+
+## Phase 3: New Features
+
+### Priority 3 (Medium)
+- Add notifications center (page + JS)
+- Add analytics/reports page
+- Add bulk operations across pages
+
+### Priority 4 (Low)
+- Standardize API response handling
+- Add loading states consistently
+- Implement pagination for large lists
+- Add confirmation dialogs
+
+---
+
+## Feature Parity Matrix
+
+| Feature | Admin | Vendor | Status |
+|---------|:-----:|:------:|--------|
+| Dashboard | ✅ | ✅ | Complete |
+| Products | ✅ | ✅ | Complete |
+| Orders | ✅ | ✅ | Complete |
+| Customers | ✅ | ✅ | Complete |
+| Inventory | ✅ | ✅ | Complete |
+| Messages | ✅ | ✅ | Complete |
+| Billing | ✅ | ✅ | Complete |
+| Team | - | ✅ | Complete |
+| Profile | - | ✅ | Complete |
+| Settings | ✅ | ✅ | Complete |
+| Content Pages | ✅ | ✅ | Complete |
+| Notifications | ✅ | ❌ | Missing page + JS |
+| Analytics | ✅ | ❌ | Missing page |
+
+---
+
+## JavaScript Files Comparison
+
+| Type | Admin | Vendor | Target |
+|------|-------|--------|--------|
+| Total JS Files | 52 | 18 | 20+ |
+| Page Coverage | ~90% | ~90% | 90%+ |
+
+---
+
+## Timeline
+
+| Phase | Tasks | Effort |
+|-------|-------|--------|
+| Phase 1 | Sidebar refactor | 2-3 hours |
+| Phase 2 | Core JS files (8) | 2-3 days |
+| Phase 3 | New features | 2-3 days |
+| **Total** | | **5-7 days** |
+
+---
+
+## Progress Tracking
+
+### Phase 1: Sidebar Refactor ✅
+- [x] Read admin sidebar for patterns
+- [x] Create vendor sidebar macros
+- [x] Implement collapsible sections
+- [x] Add localStorage persistence
+- [x] Complete mobile sidebar
+- [x] Test all states
+
+### Phase 2: Core JS Files ✅
+- [x] products.js
+- [x] orders.js
+- [x] inventory.js
+- [x] customers.js
+- [x] team.js
+- [x] profile.js
+- [x] settings.js
+- [x] content-pages.js (already exists)
+
+### Phase 3: New Features
+- [ ] Notifications center
+- [ ] Analytics page
+- [ ] Bulk operations