🧪 test: add database error path coverage for daily digest endpoint

[Sparkier]

🎯 What: The daily digest endpoint was missing coverage for the database error code path (e.g., when Supabase query fails with a 500 status).
📊 Coverage: A new test case was added to server.test.ts to mock a Supabase return value with { data: null, error: { message: 'DB Error' } } and verifies it throws an Internal Server Error and correctly logs output.
✨ Result: Test coverage for src/routes/api/newsletter/daily-digest/+server.ts is more robust, effectively verifying error propagation from the DB client to the application response.

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PR created automatically by Jules for task 5332165038931161321 started by @Sparkier

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Project	Deployment	Actions	Updated (UTC)
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