revert: PR #768: UI refactoring

[Pavan-Microsoft]

Purpose

This pull request primarily removes the custom HTTP client, API service, and custom React hooks from the frontend codebase, and updates various configuration and workflow files to reflect a new directory structure (App → app). The most important changes are grouped below.

Frontend code removal

• Deleted the custom HTTP client implementation and related interceptors from httpClient.ts, removing centralized request/response handling and singleton exports.
• Removed the entire API service layer in index.ts, including all backend interaction methods for creative brief parsing, confirmation, product selection, chat streaming, content generation, and image regeneration.
• Deleted the barrel export for all custom React hooks in hooks/index.ts.
• Removed the useAutoScroll custom hook, which handled scrolling logic in the UI.
• Deleted the useContentGeneration custom hook, which managed the content generation lifecycle and state updates.

Directory and workflow configuration updates

• Updated paths in .github/dependabot.yml and workflow files to use the new lowercase app directory structure instead of App, ensuring dependency updates and Docker builds target the correct locations. [1] [2] [3] [4] [5]

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

[github-actions]

🎉 This PR is included in version 2.4.0 🎉

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