Add contextual language intelligence to the Playground

[konojunya]

Summary

• Pin the published @stack-sh/engine 0.7.0 package and use its WASM completion and hover APIs, including imported provider catalogs.
• Add keyboard-accessible suggestions, semantic context, inline diagnostic ranges, and debounced diagnostics/preview from versioned source snapshots.
• Preserve native textarea editing and IME composition; discard stale document/caret results and convert UTF-16 selections to engine positions.
• Refresh engine-version documentation and generated example metadata.

Validation

• npm ci --ignore-scripts; npm audit signatures (639 signatures, 232 attestations)
• npm run format; npm run lint; npm test (29 UI/unit tests and 9 documentation tests)
• npm run build (52 documentation pages, 11 executable snippets, 9 example thumbnails)
• npm run cloudflare:check
• Chrome smoke: contextual keyword and icon suggestions, semantic context, diagnostics and SVG preview

Notes

• Source processing stays in the browser; no LSP server or source upload is introduced.
• Vite reports a non-blocking 503 kB main chunk warning (162 kB gzip).
• Production deployment follows merge; this PR is awaiting review.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	stack-web	ccf5fa4	Commit Preview URL Branch Preview URL	Sep 05 2026, 03:56 PM

[konojunya]

Reviewed the IME behavior against GoogleChrome modern-web-guidance v0.0.186 (ime-safe-enter-submit). Added the recommended Enter-only keyCode 229 fallback for Safari event ordering, retained native isComposing and composition lifecycle guards, and added an associated source label. Regression coverage verifies that native composing Enter and post-composition Safari Enter do not accept a suggestion, while a subsequent ordinary Enter does. Synthetic event tests passed; this is not a claim of real Safari IME testing.

Validation rerun at ccf5fa4: format, lint, 29 UI/unit tests, 9 documentation tests, full build. Cloudflare preview build succeeded.