[Feature]: Add search within the thread/chat.

[aashishsingla567]

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/web

Problem or use case

Can we have a search with cmd + F within the thread like the Codex app has?
Also, a search for the thread's sidebar would be awesome, found this issue mentioning it but not the in thread search: #1043.

Proposed solution

Search within the theards/chats to find something in the conversation without having to scroll and eyeball it.

Why this matters

Its very hard to find something by scrolling up in the thread, especially while its in middle of generation.

Smallest useful scope

Search/Find text in the thread.

Alternatives considered

No response

Risks or tradeoffs

No response

Examples or references

No response

Contribution

• I would be open to helping implement this.

[leonardoxr]

Implemented in #1501.
This adds in-thread find/search in apps/web with Cmd+F / Ctrl+F, inline match highlighting across thread content, virtualized row navigation, and follow-up polish for highlight consistency and search performance.