fix(youtube-video-element): clipboard-write & web-share added

[jeffsawyer]

Aligns the embed iframe's allow attribute with YouTube's official embed so the in-player Share / Copy-link controls can use the Clipboard and Web Share APIs.

Fixes #247

Note: might be worth making this configurable in a future update similar to other features

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Note

Low Risk
Single iframe permission string change with no auth, data, or playback logic touched.

Overview
Extends the YouTube embed iframe allow list with clipboard-write and web-share so in-player Share and copy link controls can use the Clipboard and Web Share APIs, matching YouTube’s official embed behavior (fixes #247).

No other embed packages or player logic are changed in this diff.

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