Fix description line breaks and disabled-field readability

Ticket descriptions are plain text — renderDescriptionView() now always
uses nl2br instead of parseMarkdown(), preventing markdown from mangling
single newlines into run-on paragraphs.

Override base.css opacity:0.45 on disabled .editable-metadata selects
(Priority, Category, Type) so they remain legible at full contrast on
dark/OLED screens in read mode.

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

assets/css/ticket.css

@@ -284,3 +284,14 @@ kbd {
   margin-bottom: 0.6rem;
 }
 .ticket-description-view p:last-child { margin-bottom: 0; }
+
+/* ── Disabled metadata selects (read mode) ───────────────────── */
+/* base.css sets opacity:0.45 on :disabled — override for read-   */
+/* only display fields so they remain legible on dark/OLED screens */
+.editable-metadata:disabled,
+.editable-metadata[disabled] {
+  opacity: 1;
+  color: var(--text-secondary, #7fa3bf);
+  cursor: default;
+  pointer-events: none;
+}