feat: autofocus title when creating a new page

[rmolinamir]

Summary

• Problem: Newly created pages did not consistently focus the page title input, especially across route transitions where event listeners might mount after creation.
• Solution: Introduced buffered page-created events with orchestrated drain delivery so listeners can react after mount and focus the title reliably.

Implementation

• Added buffered event fan-out support with a new drain API in the app event emitter and documented buffer vs listener responsibilities.
• Updated page creation flows (sidebar and create-page tool client) to buffer PageCreatedEvent payloads.
• Converted page route shell to a client wrapper that drains page-created events for the active page ID.
• Updated page listeners (PageTitleTextarea, PageEditor) to consume live events via useAppEventHandler while buffering is handled by orchestrated drain.
• Simplified delete-page success handling by moving route redirection logic into mutation-level onSuccess.

Verification

Code inspection and local branch diff review.

• Checks: Not run locally in this session.
• Tests: Not run locally in this session.

Notes

• Risk Level: Medium
• Refactoring: Yes, event delivery flow was intentionally refactored from per-listener flush to orchestrated drain.
• Assumptions: The page shell mounts before/alongside page listeners so drain can fan out buffered events to all mounted handlers for the page ID.

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Project	Deployment	Actions	Updated (UTC)
journl	Ready	Preview, Comment	Mar 29, 2026 10:31pm

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