Disable context menu during pending delete-for-all window

[dnlbui]

What Changed

This PR reuses the existing 15-second delete-for-all guard to temporarily disable context menu actions for any message while a delete-for-all request is pending.

• ChatModal.isMessageInDeleteForAllGuard centralizes the existing recent delete-for-all target check.
• Context menu actions for copy, reply, edit, delete, delete-for-all, join, and call invite share the same temporary disabled state.
• Offline-disabled menu actions stay disabled when the delete-for-all guard state is synced.
• Quick reaction buttons are disabled during the same guard window and reaction submission has a defensive guard.
• Call phone clicks, call joins, invite modal opening, and invite sending now stop while the source call is inside that guard window.

Fixed Flow

1. A user confirms delete-for-all on a message.
2. The existing recent target guard is marked for that message txid.
3. During the 15-second guard window, relevant context menu actions, quick reactions, and call join/invite paths are blocked.
4. Immediate duplicate or stale actions are prevented while the delete request is being submitted.

Why

The short-term fix intentionally avoids adding pending transaction metadata or a longer delete lifecycle. It protects the common immediate race where a user deletes a message for everyone and quickly tries to interact with the same still-rendered message. Offline menu state remains a separate source of disabled state, so syncing the delete-for-all guard does not re-enable network-dependent actions while offline.

Validation

• node --check app.js
• git diff --check

Closes #1407

[dnlbui]

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[dnlbui]

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Codex Review: Didn't find any major issues. Keep them coming!

Reviewed commit: bbc728bd6b

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