Update help command with all new features and mouse actions

EnhancedTerminal-Distribution/INSTALL.txt

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+Enhanced Terminal v3.0 - Installation Instructions
+==================================================
+
+1. Drag EnhancedTerminal.app to your Applications folder
+2. Right-click the app and select "Open" (first time only, due to macOS security)
+3. Read USAGE_GUIDE.md for features and keyboard shortcuts
+
+Features:
+- Multiple tabs with session persistence
+- Split panes (vertical/horizontal)
+- AI command generation (OpenAI/Ollama)
+- Command snippets with categories
+- Command history search (fuzzy)
+- Auto-suggestions from history
+- Command aliases
+- Multiple themes
+- Copy-on-select
+- Middle-click paste
+- Visual bell
+- Clickable URLs
+- Zoom pane
+- And much more!
+
+For help, press Cmd+? or type 'help' in the terminal.
+
+Enjoy!