Do not provide Public API frontend events for private

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Problem

We often use @nextcloud/event-bus internally to trigger an action or change a state from one module to another.

Events in @nextcloud/event-bus are acts as Public API: they are stored in a global namespace (potential name conflicts) and used for inter-app communication (potential unexpected breaking change).

This can lead to one app breaking another in cases of:

• Event name conflict (especially general names like show-settings without namespace prefix)
• Breaking change from using private API

TODO

• Check which events are actually required to be public
• For public events make sure they have talk: prefix for namespacing to avoid conflicts and deprecate old event name
• For private events — remove them from public API:
  • Use explicit communication: modules, function calls, application state
  • In the worst case: migrate to the local event bus

Current public events

• talk:unread:update - ✅ public, only used by Talk Desktop indirectly (but required a change)
• talk:media-settings:show - ⚠️ private
• talk:media-settings:hide - ⚠️ private
• spreed:select-active-sidebar-tab - ⚠️ private
• switch-screen-to-id - ?
• send-reaction - ?
• show-settings - ?
• show-conversation-settings - ?
• hide-conversation-settings - ?

Start by auditing the listed @nextcloud/event-bus events: talk:unread:update, talk:media-settings:show/hide, spreed:select-active-sidebar-tab, and the unnamed events. Determine which are required to remain public, then identify private-event callers and choose explicit communication or the local event bus for them. Done means public events are namespaced and private events are no longer exposed through the public API.