Tell user when they have reached the end of scrollback in FilePanel

[kittykat]

Your use case

What would you like to do?

Know when there are no more files to load (see #18489 and #18491)

Why would you like to it?

Because loading is sometimes dodgy and unreliable so I can't always tell if I've reached the oldest file

How would you like to achieve it?

• When the oldest file is reached, have an indicator (e.g. a string) above it which tells me that I am at the oldest file and there is nothing left to load
• The indicator does not show when the files between it and the newer files are still loading, it only shows when all loading is complete

Have you considered any alternatives?

No response

Additional context

No response