v2.2.0

Six batches of work since the 2.1.5 / windows-final tag:

• Batch 1 -- chat-sender tracking and a self-sender state field, the
  groundwork for working out which name in an export is the app user's own.
• Batch 2 -- a Me row on the masthead, Me name entry moved into its own
  screen, a Me strip on the chat detail screen, and a one-time Home banner
  the first time the app learns the user's name from an export.
• Batch 3 -- easier app-password entry during setup, and promoting the
  common mail providers (with AOL added) ahead of the rest of the list.
• Batch 4 -- a four-step first-run setup that replaces the earlier,
  longer walkthrough.
• Batch 5 -- Basic and Advanced settings sections, with follow-up polish
  (back-button labels, chip wrapping) and a bounded "Test connection" that
  always returns instead of being able to hang.
• Batch 6 -- "Save & connect" made to share that same bounded,
  exactly-once connection check as "Test connection"; the dead
  fadingEdgesHorizontal helper removed; the FAQ kept in sync between
  HelpScreen.kt and docs/user-guide.md, and the user guide's leftover
  Windows-desktop wording corrected to describe the Android app; version
  bump to 2.2.0 (versionCode 42).
• Batch 7 -- Backup & restore moved out of the Settings row list into its
  own screen, reached the same way as Mail account, Me and Advanced; its
  Settings row now carries a status pill ("Backed up <date>", "Backup due"
  or "No backup") so the state is visible without opening the screen.
• Batch 7 follow-up -- fixed a bug (confirmed on the Nord) where the Mail
  account screen and Settings kept showing the pre-restore mailbox (e.g.
  Gmail with a blank email) right after a successful restore, even though
  the restored settings were already correctly saved -- reopening the app
  was the only workaround, and pressing "Save & connect" without it would
  have overwritten the restored account with defaults. Also added a "Moving
  from another phone? Restore from a backup" option on the very first screen
  of a fresh install, so setting up a new phone from a backup no longer
  means clicking through to Settings first; a successful restore there can
  continue straight into mail setup with the restored provider and email
  already filled in.
• Batch 7b -- a restore during first-run setup no longer walks the user
  through "Step 3 of 4" and "Step 4 of 4"; it finishes at the app-password
  step and lands on Home, the same as skipping mail setup for later. Every
  successful restore, on first run and on the Backup & restore screen, now
  shows an inline summary of what came back (chats, already-sent count,
  cutoffs, mail account and the settings the bundle carried) and what still
  needs redoing (app password, watched folder) -- never a dialog or toast.

The Windows desktop app is not part of this or any future release; it ended
at v2.1.5 (tag windows-final), per docs/RELEASING.md.

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