Fix ssr restore: skip iCloud prompt when available, bail early on missing sudo

lib/brew.sh:
  - Before running the Homebrew installer, check `sudo -n true`. If sudo
    is not available, print a clear actionable error message with the
    manual install command and exit instead of running NONINTERACTIVE=1
    and crashing with "Need sudo access ... Administrator!" mid-way.

bin/ssr-restore:
  - Drop the unconditional "Configure iCloud / cloud drive?" prompt.
    Instead check whether the cloud directory is already mounted; if it
    is, proceed silently (the common case on an already-configured Mac).
    The prompt only appears when the directory is missing, i.e. iCloud
    is not yet signed in or the drive is not mounted — with an
    appropriate message explaining what to do.

Co-authored-by: Cursor <cursoragent@cursor.com>

bin/ssr-restore

@@ -31,6 +31,16 @@ EOF
 [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]] && { usage; exit 0; }
 
 ssr::log "ssr restore starting"
+
+# Resolve cloud dir early so we can check availability before prompting.
+_cloud_dir="$(ssr::cloud::resolve_dir 2>/dev/null)" || true
+if [[ -z "$_cloud_dir" || ! -d "$_cloud_dir" ]]; then
+    ssr::warn "Cloud directory not yet accessible: ${_cloud_dir:-<unknown>}"
+    ssr::warn "Sign in to ${SSR_CLOUD_PROVIDER:-iCloud} and ensure the drive is mounted, then press Enter."
+    ssr::confirm "Cloud drive ready — proceed with restore?" 120 \
+        || ssr::die "Aborted by user"
+fi
+
 ssr::cloud::ensure_available
 backup_dir="$(ssr::cloud::backup_dir)"
 mackup_dir="$(ssr::cloud::mackup_dir)"
@@ -39,9 +49,6 @@ brewfile="${1:-$backup_dir/Brewfile}"
 [[ -f "$brewfile" ]] || ssr::die "Brewfile not found: $brewfile"
 ssr::log "Using Brewfile: $brewfile"
 
-ssr::confirm "Configure iCloud / cloud drive and proceed with restore?" 60 \
-    || ssr::die "Aborted by user"
-
 ssr::macos::disable_gatekeeper
 ssr::macos::install_rosetta