fix(providers): use nullish coalescing for config defaults

[abhay-ramesh]

What does this PR do?

Fixes || to ?? in the provider config builder. The || operator treats false, 0, and "" as falsy and falls through to defaults, silently overriding explicit user config:

// Before: user sets forcePathStyle: false, but || treats it as falsy
result[key] = config[key] || spec.defaults[key] || "";
// forcePathStyle becomes "" (default), not false

// After: only null/undefined trigger fallback
result[key] = config[key] ?? spec.defaults[key] ?? "";
// forcePathStyle stays false

Affected configs:

• forcePathStyle: false — needed for virtual-hosted-style URLs (DigitalOcean Spaces, Backblaze B2)
• useSSL: false — needed for local MinIO without TLS
• Any boolean or numeric config value set to a falsy value

How was it tested?

• All 172 tests pass
• Type-check clean

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Project	Deployment	Actions	Updated (UTC)
pushduck	Ready	Preview, Comment	Apr 7, 2026 8:29pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 21416bb8-7599-4314-8d3f-026234357f5e

📥 Commits

Reviewing files that changed from the base of the PR and between 15809b6 and 177d9d7.

📒 Files selected for processing (1)

• packages/pushduck/src/core/providers/providers.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/provider-config-nullish-coalescing

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