fix: add apt lock timeout and official portable scrcpy fallback across Linux and Windows

- Handle Debian/Ubuntu apt-get lock contention with DPkg::Lock::Timeout
- Decouple apt update from apt install so locks on update do not block installation
- Add official portable scrcpy v4.1 fallback download for Linux (x64/arm64) and Windows (win64)
- Add scrcpy user directories to standard PATH discovery

scripts/install_deps.sh

@@ -52,6 +52,7 @@ STANDARD_PATHS=(
     "${HOME}/.local/bin"
     "${HOME}/.local/share/node/bin"
     "${HOME}/.local/share/platform-tools"
+    "${HOME}/.local/share/scrcpy"
     "${HOME}/.cargo/bin"
     "${HOME}/Library/Android/sdk/platform-tools"
     "${HOME}/Android/Sdk/platform-tools"
@@ -231,7 +232,8 @@ install_system_packages() {
 
             if has_cmd apt-get; then
                 echo -e "   ${CYAN}Detected Debian/Ubuntu (apt-get). Synchronizing and installing...${NC}"
-                ${SUDO_PREFIX} apt-get update -qq && ${SUDO_PREFIX} apt-get install -y "${PKGS[@]}" || true
+                ${SUDO_PREFIX} apt-get -o DPkg::Lock::Timeout=60 update -qq 2>/dev/null || true
+                ${SUDO_PREFIX} apt-get -o DPkg::Lock::Timeout=60 install -y "${PKGS[@]}" 2>/dev/null || true
             elif has_cmd dnf; then
                 echo -e "   ${CYAN}Detected Fedora/RHEL (dnf). Installing packages...${NC}"
                 local DNF_PKGS=()
@@ -249,6 +251,38 @@ install_system_packages() {
             fi
         fi
 
+        # Fallback: if scrcpy is still missing, try snap or install portable scrcpy in user space
+        if ! has_cmd scrcpy; then
+            if has_cmd snap && request_sudo "install scrcpy via snap"; then
+                local SUDO_PREFIX=""
+                if [ "$(id -u)" -ne 0 ]; then SUDO_PREFIX="sudo"; fi
+                ${SUDO_PREFIX} snap install scrcpy 2>/dev/null || true
+            fi
+        fi
+        if ! has_cmd scrcpy; then
+            local SCRCPY_ARCH=""
+            case "${ARCH_TYPE}" in
+                x86_64|amd64) SCRCPY_ARCH="x86_64" ;;
+                aarch64|arm64) SCRCPY_ARCH="aarch64" ;;
+            esac
+            if [ -n "${SCRCPY_ARCH}" ]; then
+                local SCRCPY_DIR="${HOME}/.local/share/scrcpy"
+                if [ ! -x "${SCRCPY_DIR}/scrcpy" ]; then
+                    echo -e "   ${CYAN}📦 Installing portable scrcpy in user space (~/.local)...${NC}"
+                    mkdir -p "${SCRCPY_DIR}" "${HOME}/.local/bin"
+                    local SCRCPY_URL="https://github.com/Genymobile/scrcpy/releases/download/v4.1/scrcpy-linux-${SCRCPY_ARCH}-v4.1.tar.gz"
+                    if curl -fsSL "${SCRCPY_URL}" | tar -xz -C "${SCRCPY_DIR}" --strip-components=1 2>/dev/null; then
+                        ln -sf "${SCRCPY_DIR}/scrcpy" "${HOME}/.local/bin/scrcpy"
+                        export PATH="${SCRCPY_DIR}:${PATH}"
+                        echo -e "   ${GREEN}✓ scrcpy installed in user space.${NC}"
+                    fi
+                else
+                    ln -sf "${SCRCPY_DIR}/scrcpy" "${HOME}/.local/bin/scrcpy"
+                    export PATH="${SCRCPY_DIR}:${PATH}"
+                fi
+            fi
+        fi
+
         # User-space fallback for adb if missing and no root privileges
         if ! has_cmd adb; then
             if [[ "${ARCH_TYPE}" = "x86_64" || "${ARCH_TYPE}" = "amd64" ]]; then