Chore description

Upgrade remaining deps with React 17-limited peer ranges: markdown-to-jsx v6 to v7, react-dropzone v5 to v14, any re-resizable residuals, snapshot-diff update. Review and update package.json overrides and resolutions entries -- remove stale ones, add new ones as needed. Drive peer gate allowlist to empty.

Depends on #12895 and here's the checklist/roadmap: https://github.com/kubeflow/pipelines/blob/master/frontend/docs/react-18-19-upgrade-checklist.md

Known direct peer-gate blockers to clear in this issue (React 18 target):**

• react-textarea-autosize@8.3.3 (react=^16.8.0 || ^17.0.0)
• Note: react-dom / react-test-renderer major bumps are handled in chore(frontend): Upgrade React to v18 #12897 and chore(frontend): Modernize JSX runtime and test utilities #12895

Acceptance Criteria:

• npm run check:react-peers passes with empty allowlist
• npm run check:react-peers:18 direct blockers are reduced to only planned React core bump items
• npm run test:ci && npm run build pass
• Markdown rendering and file upload work identically to pre-migration

Labels

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