AddMacSheet + AddWindowsSheet now use FormSheet instead of the old
KeyboardAwareSheet. Steps with no TextInput disable growWithKeyboard;
Step 2 (long onboarding list) gets an internal ScrollView so content
is scrollable within the sheet cap. Sheet heights converted from fixed
px to initialHeightPct fractions.
KeyboardAwareSheet.tsx deleted — no remaining consumers.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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