Improved settings and import handling, including cleaner popup behavior, autosave updates, and more reliable validation feedback. This release also improves remote encrypted settings import and general extension stability across Chrome and Firefox builds.

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.