Hub login session sync and login status display in options page

[Copilot]

Implements session synchronization between Selection Command Hub (selection-command.com) and the Chrome extension, and surfaces the login state in the options page.

Changes

External message handlers (hub/background.ts)

• SetSession: stores { name, image } user data to LOCAL_STORAGE_KEY.HUB_USER when Hub sends login event; validates both fields are strings before writing
• ClearSession: nulls out HUB_USER on logout

// Hub site sends to extension:
chrome.runtime.sendMessage(extensionId, { action: "SetSession", session: { name, image } })
chrome.runtime.sendMessage(extensionId, { action: "ClearSession" })

Storage (storage/const.ts, storage/index.ts)

• Added LOCAL_STORAGE_KEY.HUB_USER — uses chrome.storage.local for cross-session persistence

Type (types/index.ts)

• Added HubUser = { name: string; image: string }

Options page UI (HubBanner.tsx, HubBanner.module.css)

• Logged in → avatar + display name (image load errors handled gracefully with onError hide)
• Logged out → login link pointing to NEW_HUB_URL/auth/signin
• Reacts to storage changes via Storage.addListener for real-time sync

i18n

• Added hub_login key to all 14 supported locales

[codecov]

Codecov Report

❌ Patch coverage is 53.65854% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.19%. Comparing base (0855084) to head (907dc59).

Files with missing lines	Patch %	Lines
...es/extension/src/components/option/HubUserInfo.tsx	0.00%	42 Missing ⚠️
packages/extension/src/services/hub/background.ts	87.67%	9 Missing ⚠️
...ackages/extension/src/components/option/Option.tsx	0.00%	4 Missing ⚠️
...ages/extension/src/components/option/HubBanner.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
+ Coverage   27.09%   27.19%   +0.10%     
==========================================
  Files         315      316       +1     
  Lines       31780    31899     +119     
  Branches     1718     1732      +14     
==========================================
+ Hits         8611     8676      +65     
- Misses      23169    23223      +54     

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