docs(tutorial): declare Window members inline, not via extends

[harlan-zw]

Follow-up to #878.

The confetti tutorial still taught declare global { interface Window extends JSConfettiApi {} } — the exact shape #878 removes from the registry. An extends clause on the global Window turns any member collision with another package into an unsuppressable TS2430 at every consumer Window augmentation (#852). Declaring the member inline is type-identical and removes that failure mode.

Discovered during adversarial review of #878; one-line snippet change, verified by pnpm lint.

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• docs/content/docs/1.getting-started/3.confetti-tutorial.md

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📝 Walkthrough

Walkthrough

The confetti tutorial updates its global Window augmentation. The declaration now exposes a JSConfetti property typed from JSConfettiApi['JSConfetti']. It no longer extends JSConfettiApi.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to 16213

This localized tutorial update changes the recommended Window declaration to avoid consumer-side TypeScript conflicts; no actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the tutorial declaration change.
Description check	✅ Passed	The description explains the related type-safety issue, the inline declaration fix, and verification performed.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/confetti-tutorial-window-inline

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commit: 16213f4