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>

lib/brew.sh

@@ -5,7 +5,19 @@ ssr::brew::ensure_installed() {
     if command -v brew >/dev/null 2>&1; then
         return 0
     fi
-    ssr::log "Homebrew not found — installing (non-interactive)"
+
+    # Homebrew's install script requires sudo on macOS to write to /opt/homebrew
+    # (Apple Silicon) or /usr/local (Intel). Check before running it so we can
+    # give a clear error instead of a cryptic failure.
+    if ! sudo -n true 2>/dev/null; then
+        ssr::warn "Homebrew is not installed and sudo access is required to install it."
+        ssr::warn "Please run the following as an admin user and re-run ssr restore:"
+        ssr::warn "  /bin/bash -c \"\$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)\""
+        ssr::die "Cannot install Homebrew without sudo access."
+    fi
+
+    ssr::log "Homebrew not found — installing"
+    # NONINTERACTIVE=1 skips the confirmation prompt; sudo is available (checked above).
     NONINTERACTIVE=1 /bin/bash -c \
         "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"