chore: prepare WIP for React upgrade to 17.0.2

[bosun-ai]

Work in progress: prepare for upgrading React from 16.8.6 to 17.0.2.

Scope

• This branch currently includes lockfile changes (yarn.lock) related to dependency updates. No source files have been modified yet.

Reasoning

• Targeting React 17.0.2 to align with modern React ecosystem and future maintenance.

Impact/Risk

• Potential peer dependency updates may be required (react-dom, testing libraries, react-helmet, etc.).
• Flow-typed definitions reference react_v16.8.0 and may need to be updated for React 17.
• CI and integration tests may surface behavior differences; particularly around event delegation changes in React 17.

Follow-up work

• Update package.json to bump react and react-dom to 17.0.2.
• Audit and update peer dependencies and transitive dependencies for compatibility with React 17.
• Refresh flow-typed/react definitions to match React 17 APIs.
• Run the test suite (Jest and Cypress) and address any failures.
• Perform manual QA on critical interactions (modals, forms, lists, navigation) to confirm no regressions.

Reviewer call-outs

• Validate that lockfile changes are expected and correspond to the planned upgrade.
• Confirm any required code adjustments once dependencies are bumped.

Note

• This is a test PR and should not be merged.
• This PR is a work in progress.

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