[lexical-playground] Bug Fix: Disable equation editing in read-only mode

[neysanfoo]

Description

Currently, the equation component allows editing equations even in read-only mode.

Changes Introduced in this PR

• Prevent double clicking from showing the equation editor in read-only mode.
• Adjust event handlers that open the equation editor or handle selection changes to be disabled when in read-only mode

Before

equation_readonly_before.mov

After

equation_readonly_after.mov

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 6, 2024 6:37am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 6, 2024 6:37am

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.91 KB (0%)
lexical - esm	29.72 KB (0%)
@lexical/rich-text - cjs	38.55 KB (0%)
@lexical/rich-text - esm	31.6 KB (0%)
@lexical/plain-text - cjs	37.09 KB (0%)
@lexical/plain-text - esm	28.92 KB (0%)
@lexical/react - cjs	40.29 KB (0%)
@lexical/react - esm	32.99 KB (0%)