[FEATURE]: Expose global broadcast events for UI Dialogs and OS Attention notifications to allow cross-plugin monitoring

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Describe the enhancement you want to request

Description

Currently, when building a custom plugin to monitor or log notifications, developers can successfully intercept toast notifications by listening to the global tui.toast.show event.

However, there are no equivalent global broadcast events for Modal Dialogs or OS Attention alerts. When custom plugins attempt to intercept these by using patchGlobally on the api.ui or api.attention namespaces, the attempt fails because OpenCode intentionally sandboxes plugins, supplying each one with a unique, isolated api object instance. Modifying this instance only patches the local plugin's API, making it completely blind to actions performed by other plugins (like the official Magic Context plugin).

Impact

Due to this architectural limitation, it is currently impossible for developers to build a reliable, universal "Notification History" plugin. Custom plugins inevitably miss critical events, specifically:

• Modal Dialogs (api.ui.dialog.replace): e.g., Magic Context startup announcements and result dialogs
• OS Attention Notifications (api.attention.notify)
• Audio Alerts (api.attention.soundboard.activate)

Proposed Solution

The OpenCode core SDK should natively broadcast global events for dialogs and attention notifications, exactly like it currently does for tui.toast.show.

Please consider introducing native broadcast events such as:
• tui.dialog.show
• tui.attention.notify
• tui.soundboard.play

This would allow plugins to securely and reliably subscribe to these UI events across all plugin boundaries without resorting to fragile prototype patching or intercepting the internal module cache.`