fix: 6 UX issues — terms nav, home table, donor nav, eligibility redesign, leaderboard, stories

- terms.php: read ?role= param so back button returns to the correct register form
- register.php: pass ?role= to terms link so the round-trip works
- index.php: fetch hospital city/state from JOIN; rename "Required By" to "Posted"; show posted date
- header.php: remove Find Donors and Emergency SOS from donor nav (not relevant to donors)
- eligibility.php: full premium redesign — dark hero, numbered question cards, step progress
  indicator, green/red result panels, inline guidelines grid; removed emoji checkmark from heading
- leaderboard.php: skip empty cached results so list appears on first load without dropdown toggle;
  change badge column to show total_donations (donor_matches is empty by design)
- testimonials.php: fix broken link (submit_story.php → donor/submit_testimonial.php)
- donor/submit_testimonial.php: gate on total_donations instead of donor_matches so seeded
  donors with donation history can submit stories

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Hayredin950

lifeline/donor/submit_testimonial.php

@@ -5,13 +5,8 @@
 $userId  = $_SESSION['user_id'];
 $profile = getDonorProfile($pdo, $userId);
 
-// Only donors with at least one completed donation may submit a testimonial.
-$stmt = $pdo->prepare("
-    SELECT COUNT(*) FROM donor_matches
-    WHERE donor_id = ? AND status = 'donated'
-");
-$stmt->execute([$userId]);
-$donated = (int)$stmt->fetchColumn();
+// Donors with at least one recorded donation may submit a testimonial.
+$donated = (int)($profile['total_donations'] ?? 0);
 
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     validateCsrf();