fix(Android): restore custom row listener on reattach

[OskarEichler]

Problem and fix

BottomTabsCustomRow registered its process-wide configuration listener only during construction and removed it when detached. BottomTabsCustomRowAttacher.ensureRowHostedOn can detach and reattach the same row when its host changes, leaving that row permanently unsubscribed from later configuration updates.

This change ties the listener to the actual view lifecycle:

• register in onAttachedToWindow
• remove in onDetachedFromWindow
• apply the store's latest configuration on every attachment, covering updates that arrived while detached

The listener store is a set, so attachment registration remains idempotent.

Regression coverage

The new Robolectric test verifies that:

• an attached row receives configuration updates
• a detached row does not
• reattachment immediately catches up to the current configuration
• later updates continue to reach the reattached row

Verification

• focused regression: 1/1 passed
• full Android unit suite: 698 passed, 2 skipped, 0 failed
• Android debug Kotlin/Java compilation passed
• git diff --check passed

Breaking changes

None. This restores expected updates for an existing row after re-hosting.