Fix markdown comments breaking on reload (template whitespace parsed as code)

Stored markdown comments rendered fine in the live preview (parses the raw
textarea value) but broke after refresh: the server template emitted the
comment text on an indented line, so the on-load renderer parsed
element.textContent with ~20 spaces of leading indentation. Markdown treats
4+ leading spaces as a code block, so the first line (e.g. a heading or
table row) was mis-parsed and blocks got wrapped in <p>, producing invalid
HTML that broke the page layout.

- markdown.js: trim the text before parseMarkdown in both on-load renderers
  so template indentation can't be parsed as a leading code block.
- TicketView.php: emit the comment text inline (no surrounding whitespace)
  so the element's textContent is exactly the stored markdown.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

views/TicketView.php

@@ -621,11 +621,14 @@ include __DIR__ . '/layout_header.php';
                     </div>
                   </div>
                   <div class="comment-text<?= $markdownEnabled ? ' lt-markdown' : '' ?>" id="comment-text-<?= $commentId ?>"
-                       <?= $markdownEnabled ? 'data-markdown' : '' ?>>
-                    <?= $markdownEnabled
+                       <?= $markdownEnabled ? 'data-markdown' : '' ?>><?=
+                        // Emit inline (no surrounding whitespace) so a markdown
+                        // comment's text content isn't prefixed with template
+                        // indentation, which would be parsed as a code block.
+                        $markdownEnabled
                         ? htmlspecialchars($comment['comment_text'])
-                        : nl2br(htmlspecialchars($comment['comment_text'])) ?>
-                  </div>
+                        : nl2br(htmlspecialchars($comment['comment_text']))
+                        ?></div>
                   <textarea class="lt-input lt-textarea comment-edit-raw is-hidden"
                             id="comment-raw-<?= $commentId ?>"
                             aria-hidden="true"><?= htmlspecialchars($comment['comment_text']) ?></textarea>