Lumino tab titles - distinguish between log view tabs

[MetRonnie]

Closes #2023

Distinguish between job and workflow log tabs in the tab title, and add a caption that shows the open file. It would be good to include that in the tab title but we would need to figure out how to truncate well.

Also increased the width of the tabs and reduced the font size slightly to accommodate the longer length of "Log − Workflow" as a title

Checklist

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Tests are included (or explain why tests are not needed).
• Changelog entry included if this is a change that can affect users
• Doc PR not needed

[wxtim]

It's good. I've made some style suggestions.

[oliver-sanders]

I think the idea is that 1rem is the smallest font-size used on the page, i.e, this is supposed to define the lower-limit of readability.

[oliver-sanders]

Tested as working, looks good.

I'm not sure if we want to close #2023 just yet though. I think we might want to go a bit further, e.g, we could use a symbol for the view type (saves a few chars) and use text-editor style path shortening to reduce tab title lengths as needed.