#4404: chrome-extension: enable On all sites (host_permissions <all_urls>)

- What: - Request <all_urls> host permission for the Moltbot Browser Relay extension so Chrome exposes the “On all sites” Site access option. - Why: - Without “On all sites”, the relay extension could not reliably attach to regular https tabs in our setup; enabling “On all sites” resolved the issue. - Testing: - Manually tested on Ubuntu + Chrome: - Opened https://example.com and https://myaccount.google.com - Set extension Site access to “On all sites” - Verified attach works (badge ON) and CDP relay works. - AI-assisted: - Yes (assisted by an AI agent). Changes reviewed and tested manually. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the Chrome extension manifest to request broad host permissions (`<all_urls>`) so Chrome exposes the “On all sites” site access option, enabling the extension to attach to arbitrary tabs in the reported setup. The change is isolated to `assets/chrome-extension/manifest.json` and expands the extension’s host access beyond localhost. <h3>Confidence Score: 4/5</h3> - This PR is low risk functionally but increases permission scope significantly. - The change is a single manifest edit and should not break runtime behavior, but requesting `<all_urls>` meaningfully broadens host access and can affect user trust and store review requirements. - assets/chrome-extension/manifest.json <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->