chore: import upstream snapshot with attribution

sqlpage/templates/chart.handlebars

@@ -0,0 +1,55 @@
+<div 
+    {{#if id}}id="{{id}}"{{/if}}
+    class="card my-2 {{class}}" 
+    data-pre-init="chart" 
+    data-sqlpage-js="{{static_path 'apexcharts.js'}}"
+>
+    <div class="card-body">
+        <div class="d-flex">
+            <h3 class="card-title">{{title}}</h3>
+        </div>
+        <div class="chart" style="height: {{default height 250}}px;">
+            <div class="d-flex justify-content-center h-100 align-items-center">
+                <div class="spinner-border" role="status" style="width: 3rem; height: 3rem;">
+                    <span class="visually-hidden">Loading...</span>
+                </div>
+            </div>
+            <data hidden>
+{
+    "type": {{stringify type}},
+    "time": {{stringify time}},
+    "labels": {{stringify labels}},
+    "marker": {{stringify marker}},
+    "xtitle": {{stringify xtitle}},
+    "ytitle": {{stringify ytitle}},
+    "ztitle": {{stringify ztitle}},
+    "xticks": {{stringify xticks}},
+    "yticks": {{stringify yticks}},
+    "ystep": {{stringify ystep}},
+    "xmin": {{stringify xmin}},
+    "ymin": {{stringify ymin}},
+    "xmax": {{stringify xmax}},
+    "ymax": {{stringify ymax}},
+    "toolbar": {{stringify toolbar}},
+    "show_legend": {{stringify show_legend}},
+    "logarithmic": {{stringify logarithmic}},
+    "horizontal": {{stringify horizontal}},
+    "stacked": {{stringify stacked}},
+    "height": {{stringify (default height 250)}},
+    "colors": {{stringify (to_array color)}},
+    "points": [
+    {{~#each_row~}}
+        {{~#if (gt @row_index 0)}},{{/if~}}
+        [
+            {{~ stringify (default series (default ../title "")) ~}},
+            {{~ stringify (default x label) ~}},
+            {{~ stringify (default y value) ~}}
+            {{~#if z}}, {{~ stringify z ~}} {{~/if~}}
+        ]
+    {{~/each_row~}}
+    ]
+}
+            </data>
+        </div>
+    </div>
+</div>