Session naming and project organization improvements

Problem

Current session naming is auto-generated and often produces unhelpful or confusing names. Additionally, sessions from different projects are mixed together in the conversation list, making it hard to find relevant conversations.

Pain points

1. Session names are not meaningful — auto-generated titles often don't reflect the actual work done in the session, making it difficult to find past conversations
2. No ability to rename sessions — there's no way to manually set or edit a session name
3. Projects are mixed together — sessions from all projects appear in a single flat list with no grouping or filtering by project

Suggestion

Consider looking at how OpenAI Codex handles this — sessions are well-organized with clear project separation and intuitive naming. A similar approach would greatly improve the UX:

• Allow users to rename sessions manually
• Group sessions by project (or at least allow filtering)
• Improve auto-naming to better reflect the conversation content

Context

When working across multiple projects daily, the current flat list of poorly-named sessions becomes unusable quickly. This is especially painful when you need to reference a past conversation.