LendingPad iFrame integration on loan dashboard

The Primary purpose of this patch was to embed/iframe LendingPad's UI within a (near) full width modal on the Loan Dashboard page. This functionality replaces the exiting "Open LendingPad" functionality which opens a new tab with the loan in LP open.

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- Added embedded LendingPad experience within a full-width modal on the Loan Dashboard

- Replaced “Open LendingPad” new-tab functionality with in-app iframe integration

- Improved workflow by allowing users to access LendingPad without leaving the platform