[shell-common] Add alias for tailscale on macOS

shell-common/.config/shell-common/aliases.sh

@@ -4,6 +4,11 @@
 if [[ $(uname) == "Darwin" ]]; then
     alias ls="ls -FG"
     alias flushdns="sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder"
+
+    # Use Tailscale binary if installed via app
+    if [ -d "/Applications/Tailscale.app" ]; then
+        alias tailscale="/Applications/Tailscale.app/Contents/MacOS/Tailscale"
+    fi
 else
     alias ls="ls -F --color=auto"
 fi