fix(ui): restore utf-8 encoding and remove mojibake in select output

.github/scripts/check-text-encoding.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export LANG=C.UTF-8
+export LC_ALL=C.UTF-8
+
+if grep -R -n '馃\|鑺\|绛\|閫\|璇\|摝\|殌' scripts/; then
+  echo "Detected mojibake text in scripts/" >&2
+  exit 1
+fi
+
+python3 - <<'PY'
+from pathlib import Path
+import sys
+
+bad = []
+for path in Path("scripts").rglob("*.sh"):
+    data = path.read_bytes()
+    if data.startswith(b"\xef\xbb\xbf"):
+        bad.append(f"{path}: UTF-8 BOM is not allowed")
+        continue
+    try:
+        data.decode("utf-8")
+    except UnicodeDecodeError as exc:
+        bad.append(f"{path}: invalid UTF-8 ({exc})")
+
+if bad:
+    print("\n".join(bad), file=sys.stderr)
+    sys.exit(1)
+PY