The ability to add by amount on the first add

Feature Request: Add "spread by amount" on initial resource entry

Summary:
Enable users to specify a total amount (in addition to a percentage) the first time they add a resource, so that allocation can be spread based on a fixed amount without requiring a second edit.

Problem Statement:
When adding a resource for the first time, users can only edit the percentage allocation. If they want to allocate based on a specific amount, they must first save the resource, then reopen and edit it to change the amount. This two-step process is inefficient and increases the chance of input errors.

Proposed Solution:
Allow users, on the initial add-resource screen, to choose whether to define the allocation by percentage or by amount. When "amount" is selected, provide an input field for the total amount and automatically calculate the corresponding percentage. Ensure that the same validation and behavior used when editing an existing resource by amount is available during initial entry.

Benefits:
Reduces the number of steps required to allocate resources by a fixed amount.
Decreases the likelihood of data entry errors caused by manual percentage calculation.
Improves usability by making initial resource entry consistent with edit capabilities.
Speeds up workflows for users who typically plan allocations based on specific amounts rather than percentages.