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/TicketView.php

@@ -370,6 +370,11 @@ include __DIR__ . '/layout_header.php';
               $threadClass    = $parentId ? 'comment-reply' : 'comment-root';
               $dateStr        = date('M d, Y H:i', strtotime($comment['created_at']));
               $editedIndicator = !empty($comment['updated_at']) ? ' <span class="comment-edited lt-text-xs lt-text-muted">(edited)</span>' : '';
+              // Avatar initials + color
+              $words    = array_filter(explode(' ', $displayName));
+              $initials = strtoupper(implode('', array_map(fn($w) => $w[0], array_slice($words, 0, 2))));
+              $avatarColors = ['lt-avatar--orange', 'lt-avatar--green', 'lt-avatar--purple', ''];
+              $avatarColor  = $avatarColors[abs(crc32($displayName)) % count($avatarColors)];
               ?>
               <div class="comment <?= $depthClass ?> <?= $threadClass ?>"
                    data-comment-id="<?= $commentId ?>"
@@ -379,6 +384,7 @@ include __DIR__ . '/layout_header.php';
                 <?php if ($parentId): ?><div class="thread-line" aria-hidden="true"></div><?php endif ?>
                 <div class="comment-content">
                   <div class="comment-header lt-flex lt-flex-gap-sm lt-flex-align-center">
+                    <div class="lt-avatar lt-avatar--xs <?= $avatarColor ?>" aria-hidden="true"><?= htmlspecialchars($initials) ?></div>
                     <span class="comment-user lt-text-amber"><?= htmlspecialchars($displayName) ?></span>
                     <span class="comment-date lt-text-xs lt-text-muted">
                       <span class="ts-cell"