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Fix image filename issues in MaterialFigBench.json (6 problems affected)
## Summary
Found data quality issues in `MaterialFigBench.json` that prevent 6 out of 137 problems from being evaluated. The image filename fields contain trailing/leading whitespaces and missing file extensions.
**Fix:** Trim whitespace from 3 filenames (`3-64.png`, `6-36.png`, `B5-6.png`) and add missing `.png` extension to 3 `EXA_10-2-a` references.
## Affected Problems
| Problem ID | Current Filename | Correct Filename | Issue Type |
|------------|-----------------|------------------|------------|
| 15 | `3-64.png ` | `3-64.png` | Trailing whitespace |
| 25 | ` 6-36.png` | `6-36.png` | Leading whitespace |
| 80 | `EXA_10-2-a` | `EXA_10-2-a.png` | Missing `.png` extension |
| 81 | `EXA_10-2-a` | `EXA_10-2-a.png` | Missing `.png` extension |
| 82 | `EXA_10-2-a` | `EXA_10-2-a.png` | Missing `.png` extension |
| 128 | `B5-6.png ` | `B5-6.png` | Trailing whitespace |
## Impact
- **Total problems:** 137
- **Evaluatable:** 131 (95.6%)
- **Unevaluatable:** 6 (4.4%)
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