fix(ci): rely on idempotent dependency sync

scripts/ensure-deps.sh

@@ -3,22 +3,14 @@ set -euo pipefail
 
 ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 UI_DIR="$ROOT_DIR/ui"
-UI_SENTINEL="$UI_DIR/node_modules/@date-fns/tz/date/mini.js"
 
 ensure_root_deps() {
-  if [[ ! -d "$ROOT_DIR/node_modules" ]]; then
-    echo "[deps] Installing root dependencies"
-    (cd "$ROOT_DIR" && bun install --frozen-lockfile)
-  fi
+  echo "[deps] Syncing root dependencies"
+  (cd "$ROOT_DIR" && bun install --frozen-lockfile)
 }
 
 ensure_ui_deps() {
-  if [[ -d "$UI_DIR/node_modules" && -f "$UI_SENTINEL" ]]; then
-    return
-  fi
-
-  echo "[deps] Reinstalling UI dependencies"
-  rm -rf "$UI_DIR/node_modules"
+  echo "[deps] Syncing UI dependencies"
   (cd "$UI_DIR" && bun install --frozen-lockfile)
 }