Feature Request: Show folder/location in message tooltip popup

[HndrkDrs]

Feature Request
When hovering over a message dot in the ThreadVis visualization, the tooltip currently displays:

From (sender)
Date
Subject
Body preview
It would be very helpful (at least for my workflow) to also display the folder/location where the message is stored.

Use Case
When using ThreadVis to navigate conversations that span multiple folders (e.g., Inbox, Sent, Archive, project-specific folders), it's helpful to know which folder a specific message is located in before clicking on it.

Currently, I can see the folder only:

After clicking on the dot (in the folder pane/header area)
By looking at the folder indicator above the message list
Having the folder displayed directly in the tooltip would allow for a quick overview without leaving the current message or needing to click through the conversation.

Suggested Implementation
Option A: Add a "Folder:" line to the tooltip, similar to the existing From/Date/Subject fields:

From:     John Doe
Date:     2025-12-04 10:30
Subject:  Re: Project Update
Folder:   Work/Projects/ProjectX   ← NEW
─────────────────────────────
Message body preview...

Option B: Add a folder "pill" badge in the top right corner of the tooltip.

Option C: Display folder pills for all folders containing messages in the conversation, with the currently hovered message's folder highlighted.

(I should probably stop thinking about possibilities for this wonderful add-on, otherwise the ideas will never end 😄)

Environment
ThreadVis Version: 3.6.12
Thunderbird/Betterbird Version: 140.x ESR
OS: Windows
Additional Context
This would be especially useful for users who:

Use the Card View layout (where the Location column is not available)
Have complex folder structures
Frequently work with conversations spread across multiple accounts/folders
Thank you for maintaining this excellent add-on! 🙏

Used AI to streamline this request. Originally written in German.