build(frontend): remove deprecated pnpm runtime path

[seonghobae]

Outcome

• pins the current stable pnpm 11.24.0 with registry integrity, removing pnpm 9's Node 24 url.parse() deprecation path
• uses React 19 useEffectEvent for the requested-post transition so the Hook dependency warning is fixed without repeated post-open callbacks

Verification

• corepack pnpm install --frozen-lockfile --ignore-scripts (supply-chain policy passed, no deprecation warning)
• corepack pnpm run lint (no Hook warning)
• corepack pnpm exec tsc -b
• corepack pnpm run build (passes; the existing 539.41 kB chunk warning remains tracked as a separate performance gap in PR docs(product): establish current PRD and semantic gap baseline #621)

The isolated ontology continuation interaction passes with a diagnostic 15 s ceiling but exceeds Vitest's existing 5 s default under current local load; hosted exact-head tests remain authoritative for this package-manager-only runtime change.

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📥 Commits

Reviewing files that changed from the base of the PR and between 48f013a and 930bf3a.

📒 Files selected for processing (2)

• frontend/package.json
• frontend/src/App.tsx

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[devin-ai-integration]

Devin Review found 1 potential issue.