fix: deep audit — wire TDS v1.2 components, fix kanban/tabs/bulk/avatar

- ticket.js: fix showTab() early return preventing attachments/deps from loading
- ticket.js: fix performStatusChange() overwriting lt-status-* classes
- dashboard.js: fix updateSelectionCount() using is-visible instead of style.display
- dashboard.js: fix populateKanbanCards() to use #kanban-col-* IDs (TDS v1.2)
- dashboard.js: fix setViewMode() removing references to old non-TDS elements
- dashboard.js: remove mobile-bottom-nav injection (no CSS existed for it)
- dashboard.css: add full lt-kanban-card component styles with priority accents
- dashboard.css: add mobile sidebar overlay, filter toggle, ticket preview popup CSS
- DashboardView.php: replace priority badges with lt-chip component
- TicketView.php: add lt-avatar with initials to comment author display
- ApiKeysView.php: enhance API usage section with lt-code-block component + curl example

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

views/DashboardView.php

@@ -423,7 +423,8 @@ include __DIR__ . '/layout_header.php';
                        class="ticket-link"><?= htmlspecialchars($row['ticket_id']) ?></a>
                   </td>
                   <td data-label="Priority">
-                    <span class="lt-p<?= $pNum ?>">P<?= $pNum ?></span>
+                    <?php $chipClass = match($pNum) { 1 => 'lt-chip-critical', 2 => 'lt-chip-warn', 3 => 'lt-chip-info', default => 'lt-chip-ok' }; ?>
+                    <span class="lt-chip <?= $chipClass ?>">P<?= $pNum ?></span>
                   </td>
                   <td data-label="Title"><?= htmlspecialchars($row['title']) ?></td>
                   <td data-label="Category" class="lt-text-muted lt-text-xs"><?= htmlspecialchars($row['category']) ?></td>