The session/chat screen's KeyboardAvoidingView used behavior={undefined}
on Android, relying entirely on the native android:windowSoftInputMode
adjustResize (set in AndroidManifest.xml) to shrink the window and push
the agent/model toolbar + composer above the keyboard.
Since the app adopted Expo's mandatory edge-to-edge display, Android no
longer resizes the window when the keyboard opens (the system assumes
insets are handled dynamically), so adjustResize became a no-op —
leaving the toolbar and input completely hidden behind the keyboard.
Switch to behavior="padding" on both platforms so KeyboardAvoidingView
pushes the composer up using its own JS-measured keyboard height,
independent of native window resize.
Co-authored-by: test <test@test.local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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