feat: remember last visited page after login

Users are now redirected to their last visited page after logging in,
instead of always going to the dashboard.

Implementation:
- Track current page in localStorage on every page load
- Exclude login, logout, onboarding, and error pages from tracking
- On login success, redirect to last visited page if valid
- Clear last visited page on logout

Admin:
- static/admin/js/init-alpine.js: Save page to admin_last_visited_page
- static/admin/js/login.js: Redirect to last page after login
- app/templates/admin/partials/header.html: Clear on logout

Vendor:
- static/vendor/js/init-alpine.js: Save page to vendor_last_visited_page
- static/vendor/js/login.js: Redirect to last page (validates vendor code)

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

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

app/templates/admin/partials/header.html

@@ -287,6 +287,7 @@ document.addEventListener('alpine:init', () => {
                     // Clear admin tokens only (not vendor or customer tokens)
                     localStorage.removeItem('admin_token');
                     localStorage.removeItem('admin_user');
+                    localStorage.removeItem('admin_last_visited_page');
                     // Note: Do NOT use localStorage.clear() - it would clear vendor/customer tokens too
                     window.location.href = '/admin/login';
                 });

static/admin/js/init-alpine.js

@@ -57,6 +57,24 @@ function data() {
     }
   }
 
+  // ─────────────────────────────────────────────────────────────────
+  // Last visited page tracking (for redirect after login)
+  // ─────────────────────────────────────────────────────────────────
+  const LAST_PAGE_KEY = 'admin_last_visited_page';
+  const currentPath = window.location.pathname;
+
+  // Save current page (exclude login, logout, error pages)
+  if (currentPath.startsWith('/admin/') &&
+      !currentPath.includes('/login') &&
+      !currentPath.includes('/logout') &&
+      !currentPath.includes('/errors/')) {
+    try {
+      window.localStorage.setItem(LAST_PAGE_KEY, currentPath);
+    } catch (e) {
+      // Ignore storage errors
+    }
+  }
+
   // Map pages to their parent sections
   const pageSectionMap = {
     // Platform Administration

static/admin/js/login.js

@@ -183,14 +183,18 @@ function adminLogin() {
                 this.success = 'Login successful! Redirecting...';
                 loginLog.info('Success message displayed to user');
 
-                loginLog.info('Redirecting to dashboard immediately...');
+                // Check for last visited page (saved before logout)
+                const lastPage = localStorage.getItem('admin_last_visited_page');
+                const redirectTo = (lastPage && lastPage.startsWith('/admin/') && !lastPage.includes('/login'))
+                    ? lastPage
+                    : '/admin/dashboard';
+
                 loginLog.info('=== EXECUTING REDIRECT ===');
-                loginLog.debug('Target URL: /admin/dashboard');
-                loginLog.debug('Redirect method: window.location.href');
+                loginLog.debug('Last visited page:', lastPage);
+                loginLog.debug('Target URL:', redirectTo);
 
                 // Use href instead of replace to allow back button
-                // But redirect IMMEDIATELY - don't wait!
-                window.location.href = '/admin/dashboard';
+                window.location.href = redirectTo;
 
             } catch (error) {
                 window.LogConfig.logError(error, 'Login');

static/vendor/js/init-alpine.js

@@ -46,6 +46,19 @@ function data() {
 
             // Load vendor info
             this.loadVendorInfo();
+
+            // Save last visited page (for redirect after login)
+            // Exclude login, logout, onboarding, error pages
+            if (!path.includes('/login') &&
+                !path.includes('/logout') &&
+                !path.includes('/onboarding') &&
+                !path.includes('/errors/')) {
+                try {
+                    localStorage.setItem('vendor_last_visited_page', path);
+                } catch (e) {
+                    // Ignore storage errors
+                }
+            }
         },
 
         async loadVendorInfo() {
@@ -112,6 +125,7 @@ function data() {
                 localStorage.removeItem('vendor_user');
                 localStorage.removeItem('currentUser');
                 localStorage.removeItem('vendorCode');
+                localStorage.removeItem('vendor_last_visited_page');
                 // Note: Do NOT use localStorage.clear() - it would clear admin/customer tokens too
 
                 console.log('🔄 Redirecting to login...');

static/vendor/js/login.js

@@ -123,10 +123,20 @@ function vendorLogin() {
                 vendorLoginLog.debug('Token stored as vendor_token in localStorage');
 
                 this.success = 'Login successful! Redirecting...';
-                vendorLoginLog.info('Redirecting to vendor dashboard...');
+
+                // Check for last visited page (saved before logout)
+                const lastPage = localStorage.getItem('vendor_last_visited_page');
+                const validLastPage = lastPage &&
+                    lastPage.startsWith(`/vendor/${this.vendorCode}/`) &&
+                    !lastPage.includes('/login') &&
+                    !lastPage.includes('/onboarding');
+                const redirectTo = validLastPage ? lastPage : `/vendor/${this.vendorCode}/dashboard`;
+
+                vendorLoginLog.info('Last visited page:', lastPage);
+                vendorLoginLog.info('Redirecting to:', redirectTo);
 
                 setTimeout(() => {
-                    window.location.href = `/vendor/${this.vendorCode}/dashboard`;
+                    window.location.href = redirectTo;
                 }, 1000);
 
             } catch (error) {