Finance: Show spreadsheet for plan page

[souvikbasu]

This is a
[ ] bug
[x] feature request
[ ] documentation change
[ ] build/deploy enhancement request

Description:
Show the spreadsheet to show the existing planned items on the plan page.
For this issue, only show a read-only view of the plan page. No edit functionality is needed.
On mouse hover, the cell below it should show as highlighted.