Add version history view for timer functions

- Implement `/history/<function_id>` route in timer routes to fetch and display function versions
- Create new Mithril `DiffView` component for comparing script versions
- Add new history template for timer functions with version comparison
- Include version diff functionality using AceDiff library
- Update header and edit templates to include history URL for timer functions

routes/timer.py

@@ -402,4 +402,41 @@ def logs(function_id):
         return render_block(environment, 'dashboard/timer_functions/logs.html', 'page', **args)
     return render_template('dashboard/timer_functions/logs.html', **args)
 
+@timer.route('/history/<int:function_id>')
+@login_required
+def history(function_id):
+    # Fetch the timer function to verify ownership
+    timer_function = db.execute("""
+        SELECT id, name, code, version_number
+        FROM timer_functions 
+        WHERE id = %s AND user_id = %s
+    """, [function_id, current_user.id], one=True)
+
+    if not timer_function:
+        flash('Timer function not found', 'error')
+        return redirect(url_for('timer.overview'))
+
+    # Fetch all versions
+    versions = db.execute("""
+        SELECT version_number, script, versioned_at
+        FROM timer_function_versions
+        WHERE timer_function_id = %s
+        ORDER BY version_number DESC
+    """, [function_id])
+
+    # Convert datetime objects to ISO format strings
+    for version in versions:
+        version['versioned_at'] = version['versioned_at'].isoformat() if version['versioned_at'] else None
+
+    args = {
+        'user_id': current_user.id,
+        'function_id': function_id,
+        'timer_function': timer_function,
+        'versions': versions
+    }
+
+    if htmx:
+        return render_block(environment, 'dashboard/timer_functions/history.html', 'page', **args)
+    return render_template('dashboard/timer_functions/history.html', **args)
+