Fix notifications 500 (audit_id column), smart resolution time units

- notifications.php: audit_log PK is audit_id not log_id; alias all
  three queries with audit_id AS log_id to fix 500 error
- DashboardView: avg resolution time now picks best unit automatically
  (min < 1h, hr < 48h, days < 14d, wks otherwise) with full hours
  shown in title tooltip; adds lt-stat-unit CSS for the suffix

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

api/notifications.php

@@ -45,7 +45,7 @@ $myUsername = $currentUser['username'] ?? '';
 
 // Query 1: Tickets assigned to me (events from other users)
 $assignSql = "SELECT
-    al.log_id, al.action_type, al.entity_type, al.entity_id, al.details, al.created_at,
+    al.audit_id AS log_id, al.action_type, al.entity_type, al.entity_id, al.details, al.created_at,
     COALESCE(u.display_name, u.username, 'System') AS actor_name
   FROM audit_log al
   LEFT JOIN users u ON al.user_id = u.user_id
@@ -88,7 +88,7 @@ $stmt->close();
 
 // Step B: fetch recent comment audit events not by the current user
 $commentSql = "SELECT
-    al.log_id, al.action_type, al.entity_type, al.entity_id, al.details, al.created_at,
+    al.audit_id AS log_id, al.action_type, al.entity_type, al.entity_id, al.details, al.created_at,
     COALESCE(u.display_name, u.username, 'System') AS actor_name
   FROM audit_log al
   LEFT JOIN users u ON al.user_id = u.user_id
@@ -118,7 +118,7 @@ foreach ($rawCommentRows as $rawRow) {
 
 // Query 3: Status changes on watched tickets (from other users)
 $statusSql = "SELECT DISTINCT
-    al.log_id, al.action_type, al.entity_type, al.entity_id, al.details, al.created_at,
+    al.audit_id AS log_id, al.action_type, al.entity_type, al.entity_id, al.details, al.created_at,
     COALESCE(u.display_name, u.username, 'System') AS actor_name
   FROM audit_log al
   LEFT JOIN users u ON al.user_id = u.user_id

assets/css/dashboard.css

@@ -8,6 +8,14 @@
   margin-bottom: 1rem;
 }
 
+/* Unit suffix on resolution time stat (smaller, muted) */
+.lt-stat-unit {
+  font-size: 0.65em;
+  font-weight: 500;
+  margin-left: 0.15em;
+  opacity: 0.75;
+}
+
 /* Priority row highlights */
 .lt-row-critical td {
   background: rgba(255, 77, 77, 0.04);

views/DashboardView.php

@@ -162,10 +162,25 @@ include __DIR__ . '/layout_header.php';
     </div>
   </div>
 
-  <div class="lt-stat-card stat-time" title="Average resolution time" aria-label="Avg resolution time">
+  <?php
+  $avgHours = $stats['avg_resolution_hours'] ?? 0;
+  if ($avgHours <= 0) {
+      $avgDisplay = '—'; $avgUnit = '';
+  } elseif ($avgHours < 1) {
+      $avgDisplay = (string)max(1, (int)round($avgHours * 60)); $avgUnit = 'min';
+  } elseif ($avgHours < 48) {
+      $avgDisplay = (string)(int)round($avgHours); $avgUnit = 'hr';
+  } elseif ($avgHours < 336) { // <14 days
+      $avgDisplay = number_format($avgHours / 24, 1); $avgUnit = 'days';
+  } else {
+      $avgDisplay = number_format($avgHours / 168, 1); $avgUnit = 'wks';
+  }
+  $avgTitle = $avgHours > 0 ? number_format($avgHours, 1) . ' hours' : 'No data';
+  ?>
+  <div class="lt-stat-card stat-time" title="Average resolution time: <?= htmlspecialchars($avgTitle) ?>" aria-label="Avg resolution time">
     <div class="lt-stat-icon lt-text-muted">&#x23F1;</div>
     <div class="lt-stat-info">
-      <div class="lt-stat-value"><?= htmlspecialchars($stats['avg_resolution_hours'] ?? '—') ?>h</div>
+      <div class="lt-stat-value"><?= htmlspecialchars($avgDisplay) ?><span class="lt-stat-unit"><?= $avgUnit ?></span></div>
       <div class="lt-stat-label">Avg Resolution</div>
     </div>
   </div>