[Feature]: Add chat outline navigation strip

[Abhijitam01]

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

In long conversations, there’s no quick way to navigate back to earlier messages. Users have to manually scroll through the entire chat history to find a specific message.

Proposed solution

Add a minimap-style outline strip on the right side of the chat, beside the message content area:

• Small horizontal bars representing each user message
• Currently visible messages highlighted with brighter bars
• Hover the strip to reveal an expanded popover with message text previews
• Click any bar or popover entry to smooth-scroll the chat to that message

Why this matters

Long chats have no quick way to jump back to earlier messages — you have to scroll manually. Add a minimap strip beside the chat showing user message bars that highlight when visible and scroll-to on click, with a hover popover for previews. Also clean up dead Checks Panel code.

Smallest useful scope

Minimap strip with click-to-scroll and active message highlighting. Hover popover for previews. Dead Checks Panel cleanup.

Alternatives considered

No response

Risks or tradeoffs

No response

Examples or references

No response

Contribution

• I would be open to helping implement this.

[juliusmarminge]

Closing as delivered by merged PR #3587, which added the conversation timeline minimap and navigation affordances.