Fix lifecycle, focus loss, crossfade and tab race review findings

- MainActivity: remove rotate callbacks in onDestroy, ignore connect
  results once destroyed, rotate the background only while resumed,
  guard the fade end action.
- HomeRows: each row owns one TileAdapter over a mutable list; rebinds
  refill it and notifyDataSetChanged instead of setAdapter, so focus and
  scroll survive a sample arriving (change payload keeps the holder).
- Crossfade: flip front only on onResourceReady, cancel the animation
  before resetting alpha.
- Tab loads ignore errors from a tab that is no longer shown; Home does
  not fire a second /folders request while one is in flight.
- Load the instance logo after login in connect().
- FolderActivity: request grid focus after layout.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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