Fix: Preserve markdown formatting when copying notes #4838

[paraboys]

Fixes #4838

Summary

Preserves markdown formatting when copying note content by writing both text/plain and text/markdown MIME types to the clipboard.

Changes

• Replaced navigator.clipboard.writeText() with navigator.clipboard.write()
• Added text/markdown clipboard MIME support alongside text/plain

Why

This allows markdown-aware tools/editors to preserve markdown formatting when pasting copied note content.

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Note

Low Risk
Small UX change to local clipboard writes in the note header; no auth, data, or server impact.

Overview
Note tab Copy (memos and enhanced summaries) now writes both text/plain and text/markdown via navigator.clipboard.write() so markdown-aware paste targets keep formatting.

If the clipboard API rejects the text/markdown item, copy falls back to navigator.clipboard.writeText() so copy still works in environments that only support plain text.

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