Rename frontend run scripts and add Android emulator runner

Rename android-emulator.sh to run_android.sh and run.sh to run_web.sh,
add run_android_emulator.sh to launch the app on the emulator, and
update CLAUDE.md commands accordingly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/run_android_emulator.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+#
+# Run the OOTT front-end on the Android emulator.
+#
+# Boots the emulator first (via run_android.sh) if it isn't already running,
+# then launches the Flutter app on it. Any extra arguments are forwarded to
+# `flutter run`.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+if ! command -v flutter >/dev/null 2>&1; then
+  echo "error: 'flutter' not found on PATH." >&2
+  echo "       Enter the dev shell first (e.g. 'nix develop')." >&2
+  exit 1
+fi
+
+# Boot the emulator in the background if no Android device is connected yet.
+if ! flutter devices 2>/dev/null | grep -qi "android"; then
+  echo "No Android device detected, booting the emulator..."
+  "$SCRIPT_DIR/run_android.sh" -no-snapshot-save &
+
+  echo "Waiting for the emulator to come online..."
+  until flutter devices 2>/dev/null | grep -qi "android"; do
+    sleep 2
+  done
+fi
+
+exec flutter run -d android "$@"