Added a new “Rule Editor (Important Mail)” tab in the options page for managing a list of protected addresses/domains (backed by important-rules.json and storage.local.importantRules).

Added a new “Important Mail” switch in the options page (storage.local.importantTagEnabled) to enable/disable protection and tagging for important senders.

When enabled, messages from registered important addresses/domains are now:

Automatically tagged with Thunderbird’s built-in Important tag ($label1).

Excluded from automatic deletion in:

new-mail processing,

“Scan selected messages (delete if spoof)”,

“Scan this folder (delete spoof + important mail)” (renamed).

Refactored the options UI into two tabs (normal rules + important mail) and implemented safer DOM handling (no innerHTML for rule rows).

Improved sender-name normalization to strip decorative characters (e.g. *, ★, ☆, !, ?, etc.) and fixed a regression where table-format rules might not match correctly.

Updated manifest permissions to include messagesUpdate so message tags can be set via browser.messages.update().

v0.3 Release Notes

- Added full English localization for all UI texts.
- Updated options page: replaced innerHTML usage with safer DOM APIs.
- Improved name normalization to remove internal spaces (e.g., "A m a z o n" → "amazon").
- Updated context menu labels to English.
- No functional behavior changes to the rule engine.