feat: add required Project combobox on agreement details edit

[fpigeonjr]

Summary

• add Project combobox to agreement details edit form (non-wizard only), placed under Agreement Nickname
• source options from /projects and keep wizard flow unchanged (project still selected in step 1)
• support type-ahead by title and short title via Title (Short Title) option labels
• make project required in details edit with validation, disabled Save state, and required hint/error messaging
• strengthen unit tests for project combobox behavior and details-vs-wizard rendering/disabled save behavior
• closes ui: add Project select to Agreement form #5195

Screenshots

Automated Testing

• cd frontend && bun run format
• cd frontend && bun run lint
• cd frontend && bun run test --watch=false src/components/Projects/ProjectComboBox/ProjectComboBox.test.js src/components/Agreements/AgreementEditor/AgreementEditForm.project.test.jsx src/pages/agreements/details/AgreementDetailsEdit.test.js
• cd frontend && bun run test:coverage src/components/Projects/ProjectComboBox/ProjectComboBox.test.js src/components/Agreements/AgreementEditor/AgreementEditForm.project.test.jsx src/pages/agreements/details/AgreementDetailsEdit.test.js

Manual Tests

• edit an agreement
• change the project
• save changes
• profit

Notes

• backend agreement-history update for project_id is intentionally out of scope for this PR and will be handled separately

[Copilot]

Pull request overview

Adds a required Project combobox to the non-wizard Agreement Details edit form, sourcing options from /projects while keeping the wizard flow unchanged.

Changes:

• Introduces/updates ProjectComboBox to display options as Title (Short Title) and support required hint/error rendering.
• Wires project fetching/selection/validation into the non-wizard AgreementEditForm + disables Save when project_id is missing.
• Expands unit + Cypress coverage for wizard-vs-details rendering and required/disabled behaviors.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
frontend/src/pages/agreements/details/AgreementDetailsEdit.test.js	Updates API mocks to include projects query and richer loading/error shape.
frontend/src/components/Projects/ProjectComboBox/ProjectComboBox.test.js	Extends tests for Title (Short Title) labels and required/error messaging.
frontend/src/components/Projects/ProjectComboBox/ProjectComboBox.jsx	Adds label customization, required hint/error UI, and option label formatting using short_title.
frontend/src/components/Agreements/AgreementEditor/AgreementEditFormSuite.js	Adds project_id validation rule.
frontend/src/components/Agreements/AgreementEditor/AgreementEditForm.project.test.jsx	New tests for non-wizard-only rendering and disabled Save behavior.
frontend/src/components/Agreements/AgreementEditor/AgreementEditForm.jsx	Renders ProjectComboBox under nickname in non-wizard mode; loading includes projects.
frontend/src/components/Agreements/AgreementEditor/AgreementEditForm.hooks.js	Fetches projects, adds selection handler, validates/blocks Save when project is missing.
frontend/cypress/e2e/editAgreement.cy.js	Confirms project combobox is not shown in wizard flow.
frontend/cypress/e2e/agreementDetailsEdit.cy.js	Confirms project label exists in details edit.

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[github-actions]

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