[FIX] spreadsheet: chart side panel content should use full height

Before this commit:
- Chart side panel content height matched only its inner content
- This caused inner components to overflow and show awkward scrollbars

After this commit:
- Set panel content to h-100 to take the full available height.
- Ensures proper layout and avoids unnecessary scroll behavior

closes #8328

Task: 6080680
X-original-commit: 3dd022c
Signed-off-by: Adrien Minne (adrm) <adrm@odoo.com>
Signed-off-by: Ronakkumar Mukeshbhai Bharadiya (rmbh) <rmbh@odoo.com>

Author: rmbh-odoo

src/components/side_panel/chart/main_chart_panel/main_chart_panel.xml

@@ -19,7 +19,7 @@
       </div>
 
       <t t-set="definition" t-value="getChartDefinition(this.chartId)"/>
-      <div class="o-panel-content overflow-y-hidden">
+      <div class="o-panel-content h-100 overflow-y-hidden">
         <div class="h-100" t-att-class="store.panel !== 'configuration' ? 'd-none' : ''">
           <div class="h-100 overflow-y-auto">
             <ChartTypePicker chartId="chartId" chartPanelStore="store"/>