Fix comment submission turnstile handling

[dillchen]

Summary

• prevent CommentEditor from instantiating its own Turnstile widget and accept tokens from parent instead
• forward StickyInput turnstile state into CommentEditor so the submit button no longer stays disabled when verification is complete

Testing

• not run (not requested)

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Codex Task

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Note

Decouples Turnstile from CommentEditor and centralizes verification in StickyInput for reliable submit gating.

• Removes internal Turnstile hook from CommentEditor; adds props: isTurnstileEnabled, turnstileToken, resetTurnstile, TurnstileWidget
• Uses TurnstileWidgetComponent fallback and renders widget when enabled; guards resetTurnstile calls with optional chaining
• Submission flow in CommentEditor now validates turnstileToken, passes it to handleSubmitComment, and re-enables reset on errors
• Disables "Post" until verified when Turnstile is enabled
• StickyInput retains Turnstile via useTurnstile(...) and forwards turnstileToken/resetTurnstile/TurnstileWidget/isTurnstileEnabled to CommentEditor; also gates quick-submit/send button on token

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