Added support for multiple user API keys for both Groq and Gemini (key rotation/fallback across user-provided keys).
Added import support for settings and keys from JSON and TXT files.
Improved provider fallback order and reliability: user Groq keys, then user Gemini keys, then server Gemini key.
Improved timeout/abort handling for long-running analysis requests to reduce false failures.
Expanded diagnostic logging for provider selection, request flow, and error visibility.
Improved popup settings UX for managing key lists and imports.