v1.1.1: Fix server reconnection, sync progress, and seed phrase handling

- Fix UI stuck on "Reconnecting" after server switch: HomeViewModel now
  rebinds flows to the new synchronizer via syncRestarted signal
- Show live sync progress during download/scan phases using weighted
  totalProgress (40% download + 60% scan) with block heights
- Handle DEADLINE_EXCEEDED errors the same as UNAVAILABLE (show server picker)
- Fix seed phrase validation: normalize input to lowercase, prefer exact
  word matches over autocomplete
- Wrap server picker reconnection in try/catch to prevent crashes
- Preserve birthday height when resetting synchronizer for server switch
- Run findReachableServer on IO dispatcher to avoid blocking main thread
- Guard Twig debug logging behind BuildConfig.DEBUG
- Add build.sh script for debug/release builds
- Bump version to 1.1.1, SDK to 1.9.1-beta01

build.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -e
+
+REPO_ROOT="$(cd "$(dirname "$0")" && pwd)"
+cd "$REPO_ROOT"
+
+if [ "$1" = "--release" ] || [ "$1" = "-r" ]; then
+    echo "Building SilentDragonXAndroid release APK..."
+    bash gradlew assembleZcashmainnetRelease
+
+    APK_DIR="app/build/outputs/apk/zcashmainnet/release"
+    UNIVERSAL_APK=$(find "$APK_DIR" -name "*-null.apk" -type f | head -1)
+
+    if [ -z "$UNIVERSAL_APK" ]; then
+        echo "ERROR: Universal APK not found in $APK_DIR"
+        exit 1
+    fi
+
+    mkdir -p "$REPO_ROOT/release"
+    cp "$UNIVERSAL_APK" "$REPO_ROOT/release/SilentDragonXAndroid - v1.1.1.apk"
+
+    echo "Release APK: release/SilentDragonXAndroid - v1.1.1.apk"
+else
+    echo "Building SilentDragonXAndroid debug APK..."
+    bash gradlew assembleZcashmainnetDebug
+    echo "Debug build complete."
+fi