Add pub hours admin panel, rebuild announcements/users lists on CSS Grid

- Add a Hours admin panel (admin/hours.php, admin/hours.js) for editing
  the weekly open/close schedule and an optional per-day kitchen closing
  time, with a live preview of how it'll read on the public site
- Store hours in a new pub_hours table (inc/db.php), seeded with the
  site's existing Thu-Sat/9pm-kitchen schedule; inc/hours.php formats
  and groups it for display (day ranges, kitchen-close note, footer
  summary)
- Wire the public Visit card and both site footers (index.php, menu.php)
  to read hours from that data instead of hardcoded copy
- Rebuild the Announcements and Users admin tables onto the same CSS
  Grid list pattern already used for the Menu (admin-table-actions ->
  row-actions), and make the Announcements status toggle an in-place
  AJAX action like the menu item's (admin/index.js)
- Add the Hours tab to admin nav across all four admin pages

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

index.php

@@ -2,8 +2,10 @@
 require __DIR__ . '/config.php';
 require __DIR__ . '/inc/facebook-stats.php';
 require __DIR__ . '/inc/announcements.php';
+require __DIR__ . '/inc/hours.php';
 $fbStats = fritz_facebook_stats();
 $activeAnnouncements = get_active_announcements();
+$hoursByDay = get_all_hours();
 $siteUrl = rtrim(SITE_URL, '/');
 ?>
 <!doctype html>
@@ -157,24 +159,15 @@ $siteUrl = rtrim(SITE_URL, '/');
               </div>
             <?php endforeach; ?>
             <dl class="hours-list">
-              <div class="hours-row">
-                <dt>Thursday</dt>
-                <dd>4:00 – 10:00 PM</dd>
-              </div>
-              <div class="hours-row">
-                <dt>Friday</dt>
-                <dd>4:00 – 10:00 PM</dd>
-              </div>
-              <div class="hours-row">
-                <dt>Saturday</dt>
-                <dd>4:00 – 10:00 PM</dd>
-              </div>
-              <div class="hours-row">
-                <dt>Sun – Wed</dt>
-                <dd>Closed</dd>
-              </div>
+              <?php foreach (hours_card_rows($hoursByDay) as $row): ?>
+                <div class="hours-row">
+                  <dt><?= htmlspecialchars($row['label']) ?></dt>
+                  <dd><?= htmlspecialchars($row['text']) ?></dd>
+                </div>
+              <?php endforeach; ?>
             </dl>
-            <p class="note"><strong>Kitchen closes at 9</strong> — bar snacks stay out later. Holiday hours may vary; check our Facebook page for the latest.</p>
+            <?php $kitchenNote = hours_kitchen_note($hoursByDay); ?>
+            <p class="note"><?php if ($kitchenNote): ?><strong><?= htmlspecialchars($kitchenNote) ?></strong> — bar snacks stay out later. <?php endif; ?>Holiday hours may vary; check our Facebook page for the latest.</p>
           </div>
           <div class="card find-us reveal" id="contact">
             <svg class="pin" viewBox="0 0 24 24" fill="none" aria-hidden="true">
@@ -266,9 +259,9 @@ $siteUrl = rtrim(SITE_URL, '/');
         <div>
           <p class="col-title">Hours</p>
           <div class="hours-mini">
-            <span>Thu — Sat · 4:00–10:00 PM</span>
-            <span>Kitchen closes at 9 PM</span>
-            <span>Sun — Wed · Closed</span>
+            <?php foreach (hours_footer_lines($hoursByDay) as $line): ?>
+              <span><?= htmlspecialchars($line) ?></span>
+            <?php endforeach; ?>
           </div>
         </div>
         <div>