feat(app): move the publisher warning to Compose

AutofillPublisherChangedActivity draws the warning with the shared
theme. Keep Autofill disabled is now the primary button, and the
Possible phishing attempt title replaces the logo. Re-enabling still
takes two taps (Advanced information first) and still clears the
app's matches before returning the prepared fill response; every other
way out fills nothing. Touches that reach the warning through another
app's window are now dropped (filterTouchesWhenObscured on the decor
view), so an overlay cannot trick the user into re-enabling.

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

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