Fix NaN in Results Overview when eval metric score is not a number

[Copilot]

When eval metrics return non-numeric scores (like "❓" for unknown results), the Results Overview table incorrectly shows "NaN" instead of the appropriate fallback value.

Problem

The issue occurs in the computeOverview function when:

1. An eval metric returns a non-numeric response (e.g., "❓", "Unknown", etc.)
2. The parseScore function returns undefined for these cases
3. The scorer detection logic ms.some((m) => !isNaN(m.score)) incorrectly identifies these as numeric scorers
4. The average calculation ms.reduce((total, m) => total + m.score, 0) / ms.length includes undefined values, resulting in NaN

Example

Before fix:

model | tests | tests positive | accuracy with eval
-- | -- | -- | --
qwen2.5:3b | 20 | 20 | 100
llama3.2:1b | 20 | 20 | NaN  ← Problem: should show count of OK results

After fix:

model | tests | tests positive | accuracy with eval
-- | -- | -- | --
qwen2.5:3b | 20 | 20 | 100
llama3.2:1b | 20 | 20 | 15   ← Fixed: shows count of OK results

Solution

Updated the scorer detection and calculation logic to:

• Only consider metrics with valid numeric scores: typeof m.score === "number" && !isNaN(m.score)
• Calculate averages using only the filtered numeric scores
• Fall back to counting "ok" outcomes when no numeric scores are available

Testing

Verified the fix handles all scenarios correctly:

• ✅ All numeric scores: No regression, averages calculated correctly
• ✅ Mixed numeric/non-numeric: NaN issue resolved, averages only numeric scores
• ✅ All non-numeric scores: Shows count of successful outcomes
• ✅ Empty metrics: Handles gracefully

Fixes #174.

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