feat: nano-style footer bar, missing utility classes, CSS semantic vars

- layout_footer.php: add lt-footer with context-sensitive keyboard hint bar
  ([ ~ ] HOME | [ / ] SEARCH | [ + ] NEW | [ * ] CFG | [ ? ] HELP)
  Context adapts for dashboard, ticket, and admin pages
- layout_footer.php: wire show-keyboard-help and open-settings for all pages
- base.css: body { display:flex; flex-direction:column } + lt-main { flex:1 }
  so footer sticks to bottom of viewport on short pages
- base.css: add lt-flex-gap-xs/sm/md/lg and lt-flex-align-start/center/end
  (were used across all views but never defined — causing broken layouts)
- base.css: add --lt-danger/amber/cyan/success/text-primary CSS variables
  (referenced in ticket.css and dashboard.css fallbacks but never declared)
- base.css: add lt-text-danger/warning/success/info/primary utility classes
  (used in TicketView, DashboardView, admin views but not defined in base.css)
- DashboardView.php: remove ascii-banner.js (loaded but never called)
- TemplatesView.php: fix priority badge from lt-p* to lt-chip component

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

views/admin/TemplatesView.php

@@ -45,7 +45,8 @@ include __DIR__ . '/../../views/layout_header.php';
               <td data-label="Name"><strong><?= htmlspecialchars($tpl['template_name']) ?></strong></td>
               <td data-label="Category" class="lt-text-xs"><?= htmlspecialchars($tpl['category'] ?? 'Any') ?></td>
               <td data-label="Type" class="lt-text-xs"><?= htmlspecialchars($tpl['type'] ?? 'Any') ?></td>
-              <td data-label="Priority" class="lt-text-xs"><span class="lt-p<?= $tpl['default_priority'] ?? 4 ?>">P<?= $tpl['default_priority'] ?? 4 ?></span></td>
+              <?php $tp = (int)($tpl['default_priority'] ?? 4); $tChip = match($tp) { 1 => 'lt-chip-critical', 2 => 'lt-chip-warn', 3 => 'lt-chip-info', default => 'lt-chip-ok' }; ?>
+              <td data-label="Priority"><span class="lt-chip <?= $tChip ?>">P<?= $tp ?></span></td>
               <td data-label="Status">
                 <span class="lt-status <?= ($tpl['is_active'] ?? 1) ? 'lt-status-open' : 'lt-status-closed' ?>">
                   <?= ($tpl['is_active'] ?? 1) ? 'Active' : 'Inactive' ?>