Closes the Phase 1D migration for the safe-insets JNI chain. The C
function and its `#foreign` declaration in `android.sx` are gone;
all dispatch now goes through the sx-side `#jni_call` machinery
plus the JavaVM helpers landed in 1.26.
What's gone from `library/vendors/sx_android_jni/sx_android_jni.c`:
- `#include <android/native_activity.h>` and `<jni.h>` (no longer
needed without the JNI body).
- `sx_android_query_safe_insets` — 55 lines of `(*env)->Foo` chain
with manual `goto done` early-exit. Migrated to
`library/modules/platform/android.sx::sx_query_safe_insets_jni`
in 1.25 (15 lines of `#jni_call`).
What stays:
- `sx_android_install_input_handler` — non-JNI; struct-field
assignment against `struct android_app`'s `onInputEvent` slot.
No sx equivalent yet (would need to either land a `#android_app`-
style intrinsic or hand-roll the offset, neither of which is
Phase 1 scope).
- `<android/input.h>` and the `struct sx_android_app_min` mirror
needed by the input-handler installer.
Net diff: -55 lines in the .c file, -1 line `#foreign` decl in
android.sx. Phase 2 (declarative JNI imports) will revisit whether
the .c file can be deleted entirely (the input-handler hop may
move into a different shape).
Verification:
- zig build + zig test + run_examples + cross_compile all green.
Notable: the previously-failing `ffi-objc-call-12-rect-u64-returns`
also passes now — looks like the working-tree `#import c` work
was tidied up alongside.
- chess Android APK rebuilt + reinstalled + launched on Pixel
device; safe-insets behavior unchanged (board top edge sits below
the status bar correctly, all pieces in starting positions, no
status-bar overlap).
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