[18.0][FIX] spreadsheet_oca: inherit parent components in SpreadsheetControlPanel

[nericervin]

Summary

SpreadsheetControlPanel extends ControlPanel but overrides its static components property with only SpreadsheetName, losing Dropdown and DropdownItem that the parent template (web.ControlPanel) uses.

This causes:

OwlError: Cannot find the definition of component "Dropdown"

The error occurs when opening a spreadsheet from certain navigation paths (e.g., from a form view or a custom action), where the parent template's Dropdown component is needed.

Fix

Spread parent components before adding custom ones:

// Before (bug)
SpreadsheetControlPanel.components = {
    SpreadsheetName,
};

// After (fix)  
SpreadsheetControlPanel.components = {
    ...ControlPanel.components,
    SpreadsheetName,
};

This follows the same pattern used for SpreadsheetControlPanel.props which already spreads ControlPanel.props.

Test plan

• Open a spreadsheet from the kanban view — works before and after
• Open a spreadsheet from a form view (e.g., linked record) — fails before, works after
• Edit spreadsheet name in the control panel — works
• Breadcrumb navigation — works

[CarlosRoca13]

👍 LGTM

Thanks!