Filter out zero-count set bonuses in setBonusCountsToStately function

[Copilot]

The setBonusCountsToStately function was storing set bonus entries with zero counts in the Stately database, which doesn't make logical sense since you can't have 0 pieces of a set bonus.

This change adds filtering to exclude any set bonus entries where the count is 0, negative, or undefined before storing them in the database:

// Before: All entries were stored regardless of count
return Object.entries(setBonuses).map(([setBonusHash, count]) => ...)

// After: Only meaningful (positive) counts are stored  
return Object.entries(setBonuses)
  .filter(([, count]) => count !== undefined && count > 0)
  .map(([setBonusHash, count]) => ...)

The change includes a comprehensive test case that verifies:

• Zero-count entries are filtered out when converting to Stately format
• Valid entries (count > 0) are preserved
• Roundtrip conversion works correctly with the filtered data
• Edge cases like negative and undefined counts are handled properly

This is a minimal, targeted fix that follows the same pattern used elsewhere in the codebase for filtering out default/meaningless values, and only affects the internal data storage without impacting any external APIs.

Fixes #280.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

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