Show Best and Mean columns for 3x3x3 Blindfolded results

[coder13]

Problem

On the competition results page for a 3x3x3 Blindfolded round, both summary columns are labeled Best and both render the single result. This is visible on Rubik's WCA European Championship 2026, 3x3x3 Blindfolded Round 1.

The round uses a best-of-3 format, so the current format-only column selection treats both summary columns as single even though WCIF/WCA Live also provides the mean in average.

Expected behavior

The summary columns should be shown in this order:

1. Best, using result.best and the single record tag
2. Mean, using result.average and the average record tag

Acceptance criteria

• 3x3x3 Blindfolded result tables render Best and Mean, not two Best columns.
• The two columns display the corresponding best and mean values.
• Record badges remain attached to the correct result type.
• Other event and round-format column behavior remains unchanged.
• Add regression coverage for a 3x3x3 Blindfolded best-of-3 round.