Adopt lazy getType() as preferred approach for Selective Clipboard Format Read

[ashishkum-ms]

Summary

This PR restructures the Selective Clipboard Format Read explainer to present the lazy getType() approach as the preferred solution, based on W3C Clipboard APIs Working Group discussions.

Changes

• Present both approaches with detailed examples and tradeoffs
• Add "Preferred Approach" section explaining why lazy getType() was chosen
• Clarify security model: permission/focus checks at read() time, not getType()

[Copilot]

Pull request overview

This PR updates the Selective Clipboard Format Read explainer to present two alternative designs side-by-side and to frame the lazy ClipboardItem.getType() model as the preferred approach, reflecting the referenced W3C working group discussion.

Changes:

• Reorganizes the explainer into “Approach 1” (add types to read()) and “Approach 2” (lazy OS read on getType()), with updated examples and boundary scenarios.
• Adds a “Preferred Approach” section arguing for lazy getType() as the recommended direction.
• Updates the security discussion to describe when permission/focus/user-activation checks occur in the lazy model.

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