lesavka: verify client runtime prerequisites

scripts/install/client.sh

@@ -12,6 +12,16 @@ log() {
   printf '==> %s\n' "$*"
 }
 
+require_command() {
+  local cmd=$1
+  local pkg_hint=$2
+  if command -v "$cmd" >/dev/null 2>&1; then
+    return 0
+  fi
+  echo "❌ required command '$cmd' is unavailable after install (expected via $pkg_hint)" >&2
+  exit 1
+}
+
 mkdir -p "$TMPDIR"
 
 log "1. Installing base packages"
@@ -19,7 +29,7 @@ log "1. Installing base packages"
 # tightly versioned PipeWire packages, and Lesavka should not force an audio
 # stack upgrade just to install the client.
 sudo pacman -Sq --needed --noconfirm \
-  git rustup protobuf gcc clang evtest base-devel \
+  git rustup protobuf gcc clang evtest base-devel libpulse \
   gstreamer gst-plugins-base gst-plugins-good gst-plugins-bad gst-plugins-ugly gst-libav \
   wmctrl qt6-tools wl-clipboard xclip xsel desktop-file-utils
 
@@ -50,6 +60,21 @@ fi
 log "1c. Ensuring input group access for $ORIG_USER"
 sudo usermod -aG input "$ORIG_USER"
 
+log "1d. Verifying runtime tools"
+require_command pactl "libpulse"
+require_command wmctrl "wmctrl"
+require_command qdbus6 "qt6-tools"
+if ! command -v wl-paste >/dev/null 2>&1 \
+  && ! command -v xclip >/dev/null 2>&1 \
+  && ! command -v xsel >/dev/null 2>&1; then
+  echo "❌ no clipboard reader found after install (expected one of wl-clipboard/xclip/xsel)" >&2
+  exit 1
+fi
+if ! sudo -u "$ORIG_USER" pactl info >/dev/null 2>&1; then
+  echo "⚠️  pactl is installed, but no PulseAudio/PipeWire Pulse server is reachable right now."
+  echo "    Lesavka will still install, but local speaker/mic staging may stay empty until the host audio session is up."
+fi
+
 # 2. Rust tool-chain for both root & user
 log "2. Ensuring Rust toolchain"
 sudo rustup default stable