[Feature]: Add Chats feature like Codex so individual chats don't require making projects. #5318

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

apps/desktop
apps/mobile

Problem or use case

Currently, we need to make projects before we can chat in chats.

Proposed solution

We should be able to chat without forcing us to chat in a project, like in codex.

Why this matters

That would make it more convenient to use.

Smallest useful scope

Add it in the desktop app first before releasing it to mobile.

Alternatives considered

No response

Risks or tradeoffs

No response

Examples or references

Contribution

• I would be open to helping implement this.