feat: Comment edit/delete, auto-link URLs, markdown tables, mobile fixes

- Add comment edit/delete functionality (owner or admin can modify)
- Add edit/delete buttons to comments in TicketView
- Create update_comment.php and delete_comment.php API endpoints
- Add updateComment() and deleteComment() methods to CommentModel
- Show "(edited)" indicator on modified comments
- Add migration script for updated_at column

- Auto-link URLs in plain text comments (non-markdown)
- Add markdown table support with proper HTML rendering
- Preserve code blocks during markdown parsing

- Fix mobile UI elements showing on desktop (add display:none defaults)
- Add mobile styles for CreateTicketView form elements
- Stack status-priority-row on mobile devices

- Update cache busters to v20260124e
- Update Claude.md and README.md documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/dashboard.css

@@ -3850,6 +3850,52 @@ table td:nth-child(4) {
     }
 }
 
+/* ===== MOBILE-ONLY ELEMENTS - Hidden on Desktop ===== */
+.mobile-filter-toggle,
+.mobile-bottom-nav,
+.mobile-sidebar-close,
+.mobile-sidebar-overlay {
+    display: none !important;
+}
+
+/* ===== MARKDOWN TABLE STYLES ===== */
+.markdown-table {
+    width: 100%;
+    border-collapse: collapse;
+    margin: 1rem 0;
+    font-family: var(--font-mono);
+    font-size: 0.9rem;
+}
+
+.markdown-table th,
+.markdown-table td {
+    border: 1px solid var(--terminal-green);
+    padding: 0.5rem 0.75rem;
+    text-align: left;
+}
+
+.markdown-table th {
+    background: rgba(0, 255, 65, 0.1);
+    color: var(--terminal-green);
+    font-weight: bold;
+}
+
+.markdown-table tr:hover td {
+    background: rgba(0, 255, 65, 0.05);
+}
+
+/* Auto-linked URLs styling */
+.auto-link {
+    color: var(--terminal-cyan);
+    text-decoration: none;
+    word-break: break-all;
+}
+
+.auto-link:hover {
+    color: var(--terminal-amber);
+    text-decoration: underline;
+}
+
 /* ===== MOBILE STYLES - PHONES (max 768px) ===== */
 @media (max-width: 768px) {
     /* ===== BASE RESETS ===== */