Feature: Editable Chat Session Titles #52

Description

Allow users to rename chat sessions after auto-generated title creation, with updates synced and reflected throughout project and all-chats views.

Acceptance Criteria

• User can edit a chat session title inline.
• Title changes persist to DB and sync to clients.
• Updated titles render in both project chat sidebar and workspace all-chats index.

Tasks

• Add inline title edit UI and validation rules.
• Add update mutation for session title.
• Wire optimistic UI update and Electric reconciliation.
• Add tests for title editing and sync propagation.

Tracer Bullet Reference

Depends on persistence feature foundation.

Additional Context

Default title remains auto-generated from initial user message; user edit overrides it.