feat: visual polish, nav login link, pricing badge fix, cursor fix, button contrast

- Hero mockup: enhanced 3D perspective and shadow
- Testimonials: illustrated SVG avatars
- Growth pricing card: visual prominence (scale, gradient, badge)
- Most Popular badge: repositioned to avoid overlapping heading
- Nav: added Log In link next to Start Free Trial
- Fixed btn-primary text colour on anchor tags (white on blue)
- Fixed cursor: default on all non-interactive elements
- Disabled user-select on non-form content to prevent text caret

subscription-middleware.js

@@ -0,0 +1,80 @@
+/**
+ * Middleware to check subscription status for protected routes
+ */
+export function requireActiveSubscription(req, res, next) {
+  // Check if user has subscription info attached
+  if (!req.subscription) {
+    return res.status(403).json({ 
+      error: 'Active subscription required',
+      code: 'NO_SUBSCRIPTION'
+    });
+  }
+
+  // Check if subscription is active (not cancelled or past due)
+  if (req.subscription.status !== 'active' && req.subscription.status !== 'trialing') {
+    return res.status(403).json({
+      error: 'Subscription not active',
+      code: 'SUBSCRIPTION_INACTIVE',
+      status: req.subscription.status
+    });
+  }
+
+  // Check if trial has expired (if trialing)
+  if (req.subscription.status === 'trialing' && req.subscription.trial_end) {
+    const trialEnd = new Date(req.subscription.trial_end);
+    if (new Date() > trialEnd) {
+      return res.status(403).json({
+        error: 'Trial period expired',
+        code: 'TRIAL_EXPIRED'
+      });
+    }
+  }
+
+  next();
+}
+
+/**
+ * Middleware to attach subscription info to request
+ * Must be placed after verifyToken middleware
+ */
+export function attachSubscription(pool) {
+  return async (req, res, next) => {
+    if (!req.user) {
+      return next();
+    }
+
+    try {
+      const result = await pool.query(
+        'SELECT * FROM subscriptions WHERE user_id = $1',
+        [req.user.id]
+      );
+
+      if (result.rows.length > 0) {
+        req.subscription = result.rows[0];
+      }
+    } catch (error) {
+      console.error('Error fetching subscription:', error);
+    }
+
+    next();
+  };
+}
+
+/**
+ * Middleware to check if user is on free tier or has active subscription
+ */
+export function requireFreeOrSubscription(req, res, next) {
+  // Free tier is always allowed
+  if (req.user && req.user.tier === 'free') {
+    return next();
+  }
+
+  // Otherwise, require active subscription
+  return requireActiveSubscription(req, res, next);
+}
+
+export default {
+  requireActiveSubscription,
+  attachSubscription,
+  requireFreeOrSubscription
+};