Update Backtrace Android binaries for 16KB support

Replace `libbacktrace-native.so` and `libnative-lib.so` with new builds aligned for 16KB page size.
Remove `libcrashpad_handler.so` from all ABI folders
Add 16kb verification script

Author: melekr

packages/react-native/android/src/main/jniLibs/arm64-v8a/libbacktrace-native.so

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+# Bash 3.2 compatible (macOS). Enforces 16KB alignment only for arm64-v8a and x86_64.
+set -euo pipefail
+
+ROOT="${1:-packages/react-native/android/src/main/jniLibs}"
+# ABIs to enforce (space-separated). Edit or override via: ABIS="arm64-v8a x86_64" bash ...
+ABIS=${ABIS:-"arm64-v8a x86_64"}
+
+# --- Locate an ELF reader: readelf (Linux), greadelf (Homebrew), or llvm-readobj (Homebrew) ---
+READER=""; MODE=""
+if command -v readelf >/dev/null 2>&1; then
+  READER="readelf"; MODE="readelf"
+elif command -v greadelf >/dev/null 2>&1; then
+  READER="greadelf"; MODE="readelf"
+elif command -v llvm-readobj >/dev/null 2>&1; then
+  READER="llvm-readobj"; MODE="llvm"
+elif command -v brew >/dev/null 2>&1; then
+  BINUTILS_PREFIX="$(brew --prefix binutils 2>/dev/null || true)"
+  LLVM_PREFIX="$(brew --prefix llvm 2>/dev/null || true)"
+  if [[ -n "$BINUTILS_PREFIX" && -x "$BINUTILS_PREFIX/bin/greadelf" ]]; then
+    READER="$BINUTILS_PREFIX/bin/greadelf"; MODE="readelf"
+  elif [[ -n "$LLVM_PREFIX" && -x "$LLVM_PREFIX/bin/llvm-readobj" ]]; then
+    READER="$LLVM_PREFIX/bin/llvm-readobj"; MODE="llvm"
+  fi
+fi
+
+if [[ -z "$READER" ]]; then
+  cat <<'EOF' >&2
+❌ No ELF reader found.
+   Fix one:
+     - brew install binutils   # then export PATH="$(brew --prefix binutils)/bin:$PATH"
+     - brew install llvm       # then export PATH="$(brew --prefix llvm)/bin:$PATH"
+     - (Linux) apt-get install binutils
+EOF
+  exit 2
+fi
+
+get_max_align() {
+  # echo max PT_LOAD alignment (bytes) for a given .so
+  local so="$1" max=0
+  if [[ "$MODE" == "readelf" ]]; then
+    # readelf -lW ... -> ... Align 0x####
+    # awk '{print $NF}' prints the final token (alignment)
+    while IFS= read -r align_hex; do
+      align_hex="${align_hex#0x}"
+      # bash 3.2 supports base conversion via $((16#...))
+      local val=$((16#$align_hex))
+      if (( val > max )); then max=$val; fi
+    done < <("$READER" -lW "$so" 2>/dev/null | awk '/LOAD/ {print $NF}')
+  else
+    # llvm-readobj --program-headers ... -> 'Type: PT_LOAD' ... 'Alignment: 0x####'
+    local inload=0
+    # We can’t do multi-state parsing easily in pure shell; use awk.
+    while IFS= read -r align_hex; do
+      align_hex="${align_hex#0x}"
+      local val=$((16#$align_hex))
+      if (( val > max )); then max=$val; fi
+    done < <("$READER" --program-headers "$so" 2>/dev/null \
+            | awk '/Type: PT_LOAD/ {inload=1} inload && /Alignment:/ {print $2; inload=0}')
+  fi
+  echo "$max"
+}
+
+if [[ ! -d "$ROOT" ]]; then
+  echo "❌ Directory not found: $ROOT" >&2
+  exit 1
+fi
+
+fail=0
+# Iterate ABIs without 'mapfile'
+for abi in $ABIS; do
+  abi_dir="$ROOT/$abi"
+  if [[ ! -d "$abi_dir" ]]; then
+    echo "⚠️  ABI directory missing (skipping): $abi_dir"
+    continue
+  fi
+
+  # List .so files; avoid mapfile, use while+read with -print0/-d ''
+  has_any=0
+  while IFS= read -r -d '' so; do
+    has_any=1
+    max_align="$(get_max_align "$so" || echo 0)"
+    if [[ -z "$max_align" || "$max_align" -lt 16384 ]]; then
+      printf "❌ %s Align %s < 16384 (0x4000)\n" "$so" "${max_align:-N/A}"
+      fail=1
+    else
+      printf "✅ %s Align %d (>= 16384)\n" "$so" "$max_align"
+    fi
+  done < <(find "$abi_dir" -type f -name '*.so' -print0 2>/dev/null)
+
+  if [[ "$has_any" -eq 0 ]]; then
+    echo "⚠️  No .so files under: $abi_dir"
+  fi
+done
+
+exit "$fail"