Allow servers to update dialog registry entries dynamically during PLAY

Minecraft’s dialog system is powerful, but servers using vanilla clients cannot dynamically update registered dialog content during PLAY.

Dialogs such as those used by #minecraft:quick_actions are registered during configuration. Servers can change which registered dialog Quick Actions points to, but changing the dialog itself requires reconfiguration, which can cause loading screens, respawns, or reconnect-like behavior.

It would be useful to add either:

• A PLAY-state packet that lets servers update or replace individual minecraft:dialog entries, or
• A packet/event sent when the player presses Quick Actions, allowing the server to respond with a freshly generated dialog.

This would allow live player-specific UI for reputation, levels, currency, teams, civilizations, jobs, leaderboards, and context-sensitive menus.

Right now, servers must pre-register many possible dialog states, which does not scale well.

Ideally:

PLAY → update dialog → client uses new version

or

Quick Actions pressed → server receives event → server sends current dialog

This would make dialogs much more useful for dynamic server UI without requiring client mods or resource packs.