fix: remove DOM side effects from React19Dispatcher render()

[Copilot]

• Move applyNonHostedAttributes() to componentDidMount (keep in componentDidUpdate)
• Remove init() method and its call from render()
• Run tests to validate (298 passed)
• Remove accidentally committed package-lock.json
• Resolve merge conflicts by syncing with updated v3.0.0 base branch (303 tests pass)
• Sync CI config and helmetData tests with latest v3.0.0 base branch

The original render side-effect fix is already incorporated in the base branch. This PR now has zero diff against v3.0.0 and can be closed as resolved.

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[staylor]

@copilot you have merge conflicts

[Copilot]

@copilot you have merge conflicts

Resolved in 1e477fb. I synced all conflicting files (src/React19Dispatcher.tsx, src/HelmetData.ts, src/Provider.tsx, src/server.ts, and the updated test files) with the current v3.0.0 base branch. All 303 tests pass.

[staylor]

@copilot mege conflicts still? rebase this PR and see if still relevant

[Copilot]

@copilot mege conflicts still? rebase this PR and see if still relevant

Synced in 9f7c45e. I can't rebase (no force push available), but I've updated the 2 remaining files (.github/workflows/ci.yml and __tests__/server/helmetData.test.tsx) to match the latest v3.0.0. The PR now has zero diff against the base branch — the original render side-effect fix is already fully incorporated in v3.0.0. This PR can be closed as resolved.