🧪 Add tests for doTry error handling paths

[google-labs-jules]

🎯 What: The error path in doTry (which uses String(err) for non-Error thrown values) was not fully covered by tests for non-string objects and null values.
📊 Coverage: Tests for throwing null and a custom object with a toString method are now added.
✨ Result: Test coverage for src/helpers.ts error path is improved.

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PR created automatically by Jules for task 14473273219737201413 started by @zknpr

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Project	Deployment	Actions	Updated (UTC)
sq-lite-explorer	Ready	Preview, Comment	May 30, 2026 5:10pm

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