fix: show last 20 lines on build failure and unhide clean errors

Build failures now display a colored error banner with the last 20
lines of Gradle output. Removed stderr suppression from clean_build
so Gradle errors are visible.

Made-with: Cursor

build.sh

@@ -240,19 +240,31 @@ build_release() {
     info "Building release APK... (this may take a minute)"
     echo ""
 
-    local store_file
+    local store_file build_log exit_code
     store_file="$(cd "$(dirname "$KEYSTORE_FILE")" && pwd)/$(basename "$KEYSTORE_FILE")"
+    build_log=$(mktemp)
 
-    if ./gradlew assembleRelease \
+    set +e
+    ./gradlew assembleRelease \
         -Pandroid.injected.signing.store.file="$store_file" \
         -Pandroid.injected.signing.store.password="$password" \
         -Pandroid.injected.signing.key.alias="$KEY_ALIAS" \
-        -Pandroid.injected.signing.key.password="$password"; then
+        -Pandroid.injected.signing.key.password="$password" 2>&1 | tee "$build_log"
+    exit_code=${PIPESTATUS[0]}
+    set -e
 
+    if [[ $exit_code -eq 0 ]]; then
+        rm -f "$build_log"
         copy_apk "release"
     else
         echo ""
-        error "Build failed. Check the output above for details."
+        echo -e "${RED}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
+        error "BUILD FAILED"
+        echo -e "${RED}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
+        echo ""
+        echo -e "${DIM}Last 20 lines of build output:${NC}"
+        tail -20 "$build_log"
+        rm -f "$build_log"
         return 1
     fi
 }
@@ -261,11 +273,26 @@ build_debug() {
     info "Building debug APK..."
     echo ""
 
-    if ./gradlew assembleDebug; then
+    local build_log exit_code
+    build_log=$(mktemp)
+
+    set +e
+    ./gradlew assembleDebug 2>&1 | tee "$build_log"
+    exit_code=${PIPESTATUS[0]}
+    set -e
+
+    if [[ $exit_code -eq 0 ]]; then
+        rm -f "$build_log"
         copy_apk "debug"
     else
         echo ""
-        error "Build failed. Check the output above for details."
+        echo -e "${RED}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
+        error "BUILD FAILED"
+        echo -e "${RED}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${NC}"
+        echo ""
+        echo -e "${DIM}Last 20 lines of build output:${NC}"
+        tail -20 "$build_log"
+        rm -f "$build_log"
         return 1
     fi
 }
@@ -273,7 +300,7 @@ build_debug() {
 clean_build() {
     info "Cleaning build artifacts..."
 
-    ./gradlew clean 2>/dev/null
+    ./gradlew clean
 
     if [[ -d "$DIST_DIR" ]]; then
         rm -rf "$DIST_DIR"