feat: fix group names, add send history, fix scheduled recipient, default inbox tab

- Fix group names showing last sender's name instead of actual subject:
  use dedicated _verifiedGroupNames in-memory cache populated exclusively
  by /group/findGroupInfos API, never from contaminated IndexedDB cache
- Add v5 one-time cleanup to wipe poisoned contact/conversation cache
- Add send history feature: sent messages from Compose tab are now tracked
  in a "Send History" section under Scheduled Jobs with resend/delete actions
- Add new IndexedDB store (send_history) with DB version bump to v3
- Fix scheduled messages from Inbox using internal DB ID instead of phone
  number: new chatResolveApiNumber() handles groups (@g.us), phones
  (@s.whatsapp.net), LID (@lid), and DB internal IDs correctly
- Make Inbox the default tab on page load instead of Compose
- Add poll details panel UI for viewing poll vote breakdowns
- Support poll message rendering with vote aggregation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: erancybersec