Add Wispr Flow install script for macOS

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

install.d/75-wispr-flow.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# -----------------------------------------------------------------------------
+# Description:
+#   (macOS only) Install Wispr Flow.
+#
+
+# macOS only
+[[ "$DOTS_OS" != "macos" ]] && { log_skip "Not macOS"; return 0; }
+
+if ! echo "$BREW_CASKS" | grep -q "^wispr-flow$"; then
+    brew install --cask wispr-flow
+else
+    echo "Wispr Flow is already installed."
+fi
+log_pass "Wispr Flow installed"