feat: #999 create opening step 2 3 frontend scaffolding

[craigyu]

Description

Implements #999

Needs to log in with an account with forest client(s) assigned on FAM.

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Pull Request Overview

This PR implements frontend scaffolding for steps 2 and 3 of the opening creation process, building upon the file upload functionality from step 1. It establishes the data form structure with validation and review capabilities.

• Adds comprehensive form handling with input validation for opening details (org unit, category, gross area, etc.)
• Implements tenure information management with add/edit/delete capabilities and primary license selection
• Creates a review & create step with cancel confirmation modal and form validation

Reviewed Changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
frontend/src/utils/ValidationUtils.ts	Adds numeric validation utility function
frontend/src/utils/InputUtils.ts	Updates scrollToSection to handle optional ID parameter
frontend/src/types/FormInputType.ts	Defines generic form input type for validation state
frontend/src/styles/theme.scss	Removes unused grid imports
frontend/src/styles/default-components.scss	Adds new CSS classes for form styling
frontend/src/services/OpenApi/services/CodesEndpointService.ts	Updates API endpoint URL for opening categories
frontend/src/services/OpenApi/models/*	Fixes duplicate type unions in model definitions
frontend/src/screens/CreateOpening/*	Major refactor to use structured form state and implement multi-step validation
frontend/src/components/CreateOpeningSteps/*	Implements DataForm component with tenure management and form validation
frontend/src/components/MapPreview/index.tsx	Makes geojson prop optional and adds null check
Test files	Updates tests to reflect API endpoint changes and model updates
backend/src/main/java/ca/bc/gov/restapi/results/oracle/endpoint/CodesEndpoint.java	Updates endpoint path from /categories to /opening-categories

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[Abradat]

Amazing, LGTM! 🚀