Mitigate security risk: content script access to chrome.storage.sync

[NDevTK]

This PR mitigates a security risk where chrome.storage.sync was accessible to website content scripts, potentially allowing malicious sites to modify extension settings.

Changes:

1. background.js:

   • Updated restore() to prioritize loading settings from chrome.storage.session (trusted runtime storage).
   • Removed the chrome.storage.onChanged listener for options and exclude keys, effectively ignoring direct storage writes from untrusted sources (content scripts).
   • Implemented a new updateOptions message handler that verifies the sender is a trusted extension page before updating state and storage.
   • Updated toggleOption to sync internal changes to chrome.storage.session.

2. options.js:

   • Replaced direct chrome.storage.sync.set calls with a new sendUpdate function that sends updateOptions messages to the background script.

This architecture ensures that while chrome.storage.sync is still used for persistence and syncing, the authoritative runtime state is protected, and updates are validated.

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PR created automatically by Jules for task 1381566129880040394 started by @NDevTK

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