[Issue #10419] Add validation to award recommendation submission edit page

[nathan-stricker]

Summary

Work for #10419

Changes proposed

• Add required-field validation on the award recommendation submission edit form (single and bulk), with a top USWDS alert and per-field error messages for Recommendation, Reason for exception (when the exception checkbox is checked), and Amount recommended
• Replace native select required with a “Select one” placeholder and custom validation
• Strip non-numeric characters from Amount recommended while typing (same approach as budget amount inputs), via new sanitizeCurrencyInput helper

Context for reviewers

Validation lives in RecommendationDetailForm and is wired through RecommendationSubmissionEditForm (single) and EditRecommendationsForm (bulk). Amount recommended is still formatted as currency on blur; sanitization only restricts input while typing.

Validation steps

• Submit single and bulk edit with Recommendation, exception reason (when checked), and/or Amount recommended empty
  • validate presence of top alert + field errors block submit
• Fill required fields
  • validate that submit succeeds
• Type letters in Amount recommended
  • validate that non-numeric characters are rejected; blur still formats currency

[chay-REIsys]

LGTM!!