fix: Add task numbers to mobile task index

- Extract task number from title (#XX pattern) or Task ID field
- Display task number in gold before title
- Clean up redundant 'Task #XX:' from displayed title
- Sort by priority, then task number, then title

Chronicler #69

tasks-index.njk

@@ -136,11 +136,18 @@ permalink: /tasks-index.html
             text-decoration: underline;
         }
         
+        .task-number {
+            color: var(--gold);
+            font-weight: 700;
+            margin-right: 6px;
+        }
+        
         .priority-badge {
             font-size: 0.75rem;
             padding: 2px 8px;
             border-radius: 4px;
             font-weight: 600;
+            white-space: nowrap;
         }
         
         .priority-badge.P1 { background: var(--fire); }
@@ -208,7 +215,7 @@ permalink: /tasks-index.html
                 <div class="task-header">
                     <div class="task-title">
                         <a href="{{ task.giteaUrl }}" target="_blank" rel="noopener">
-                            {{ task.title }}
+                            {% if task.taskNumber %}<span class="task-number">#{{ task.taskNumber }}</span>{% endif %}{{ task.title | replace("Task #" + task.taskNumber + ":", "") | replace("Task #" + task.taskNumber, "") | replace("Task:", "") | trim }}
                         </a>
                     </div>
                     <span class="priority-badge {{ task.priority }}">{{ task.priority }}</span>