fix(results): remove redundant "← All evaluations" back link

With the new master/detail layout the rail is always visible on the left, so
the back-to-list link in ResultsHeader served no purpose — users navigate
between runs via the rail, and there's no list-only mode to "go back" to.
Header now just shows the "Evaluation index" eyebrow whether or not a run
is selected, matching the pattern on /data and /history.

Author: DataGomes

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